LSBLG/MC IOMM

Installation Operation Maintenance Manual

Water-Cooled Screw Chiller

LSBLG /MC Series

Version：200901a

★Please read this manual carefully before installing and Operating your chiller★

LSBLG/MC IOMM

CONTENTS 1. General

1.1 Brief Introduction

1.2 Nomenclature

1.3 Storage

1.4 Main Parts

1.4.1 The Compressor

1.4.2 The Condenser

1.4.3 The Evaporator

1.4.4 The Oil Separator

1.4.5 The Throttle

1.4.6 The Capacity Control

1.4.7 The Refrigerant

1.4.8 The Lubricant

1.4.9 The Oil Filter

1.4.10 The Refrigerant Filter

2. Safety Instructions 2.1 Installation Safety Instructions

2.2 Maintenance Safety Instructions

2.3 Repairing Safety Instructions

2.4 Electrical Safety Instructions

3. Installation 3.1 Installation Environment

3.2 Acceptance

3.3 Rigging

3.4 Installation

3.4.1 Installation Foundation

3.4.2 Fixation of Unit

3.4.3 Service Space

3.5 Installation of Other System

3.5.1 Water System

3.5.2 Electrical System

4. Running 4.1 Running Range

4.2 Water Flow Rate Range

4.3 Specifications

4.4 Check before Start

4.4.1 Electrical Part

4.4.2 Water System

4.4.3 The Unit

4.5 Start the Unit

4.5.1 Normal Start and Stop

4.5.2 Emergency Stop

4.5.3 Running under Low Ambient Temperature

4.6 PLC Operation

4.6.1 Structure of PLC Control System

4.6.2 Welcome Page

4.6.3 Main Page

4.6.4 System Settings

4.6.5 Parameter Check

4.6.6 Warning and Protection Page

4.6.7 Trend Curves Page

4.6.8 Data Report Page

LSBLG/MC IOMM

5. Maintenance 5.1 Routine Check

5.2 Charge the Lubricant

5.3 Charge the Refrigerant Gas

5.4 Change the Core of Dry Filter

5.5 Maintenance of Bearing of the Compressor

5.6 Check the Rotors of the Compressor

5.7 Check the Heat Exchange Tubes

5.8 Electrical Control Cabinet

5.9 Seasonal Maintenance

5.9.1 Stop in Winter

5.9.2 Start in Summer

5.10 Anti-freezing Protection in Low Ambient Temperature

5.10.1 Anti-freezing Protection of Condenser

5.10.2 Anti-freezing Protection of Evaporator

5.11 Common Faulty Diagnosis

5.11.1 Reset of Warning

5.11.2 Troubleshooting

5.12 Clean Procedure

5.12.1 Relation between water quality, scale and degree of corrosivity

5.12.2 Wash the Shell and Tube Heat Exchange

6. Appendix

6.1 Outline Dimension Diagram

6.2 Refrigeration Circuit Diagram

6.3 Electrical Circuit Diagram 6.4 Pressure Enthalpy Chart of R134a

Midea® reserves the right to improve the product and technology without prior notice.

LSBLG/MC IOMM

1．General

1.1 Brief Introduction

Midea water cooled LSBLG/MCF series chillers equipped with 1 or 2 twin screw

compressors using the latest 5-6 asymmetry dentiform. They are manufactured to satisfy

the requirements of the consultant and the end user. Midea LSBLG/MCF series units

minimized energy costs while maximizing the refrigeration capacities. Once again Midea

has developed a line of chillers unsurpassed in performance and quality that will meet the

most stringent requirement of comfort cooling, plastic, electroplating, food processing and

chemical industrial, etc.

1.2 Nomenclature

LS B LG 115 /M C

Design Code

Norminal Capacity (kW)

LG: Screw Compressor

B: Semi-hermetic Compressor

Water Chiller

Refrigerant Code: R134a

1.3 Storage Please follow the rules if the chiller has to be put aside for a long time before it is installed:

Put the unit indoor, and the ambient temperature should be no more than 50℃;

Put the unit far away from any heat source;

Put the unit where the water doesn’t go into easily;

Never put the unit under the direct sunlight.

1.4 Main Parts

LSBLG /MC screw water chiller consist of four main parts which are compressor,

condenser, throttle and evaporator. There are single compressor and dual-compressor

units which capacity is from 115kW to 1300kW.

1.4.1 The Compressor

The LSBLG/MC series screw chiller equipped with the 3rd generation industrial compressor that has the latest advanced 5-6 asymmetry dentiform semi-hermetic screw rotors. The

LSBLG/MC IOMM

lubricant is supplied automatically by pressure difference inside the compressor. It is unnecessary to add an extra lubricant pump. The bearing of the compressor is from SKF, Sweden, the long lifespan of which ensures screw-type main unit to run continuously more than 30,000 hours.

Fig 1.1 Rotors Fig 1.2 The Compressor

Working Principle

Suction While the rotors rotating, the refrigerant is sucked inside from the lower position of the rotors.

Fig 1.3 Suction Process

Compression

Since the rotors running, the room between the gears (V room) reduces because of the mating, which makes the gas compressed and the pressure increased.

Fig1.4 Compression Process

Discharge The V room connects to the discharge port, which start the discharge process. This process continues until the gas gets out completely.

LSBLG/MC IOMM

Fig 1.5 Discharge Process

1.4.2 The Condenser

High quality shell is made of rolled steel plate. It is covered with anti-rust paint which can maintain at least 20 years after shot peening treatment.

High precise temperature difference makes the COP increased rapidly. It can be designed to suitable for different fouling factors. There is a reserved 15% heat

exchange capacity design which can make the condenser provide enough capacity even

the cooling water temperature reaches 32℃ or there is fouling inside the water system.

High efficient sub-cooler inside the condenser makes the liquid refrigerant cooled again to increase the cooling efficiency.

Fig 1.6 Internal Structure of the Condenser

1.4.3 The Evaporator

LSBLG/MC series screw chiller is equipped with high efficiency shell and tube evaporator that are constructed by seamless steel tube with anti-corrosive treatment. The evaporator is a direct expansion type with refrigerant inside the copper tubes and water on the outside. The copper tubes are roll expanded into carbon steel tube plates. Constructed with seamless integrally finned copper, the water pipe system makes the evaporator attain optimal heat exchange efficient. Two return passages of water flow and the straight water pipe is easy for cleaning and maintenance. Both end covers are made of iron and attached with protection valve and snuffle valve. Also they are removable, which makes it available for altering water piping arrangement. The design working pressure for both evaporator and condenser are 1.0MPa, higher pressure demand can be customized.

LSBLG/MC IOMM

Fig 1.7 Internal Structure of the evaporator

1.4.4 The Oil Separator There is a high efficient oil separator inside the compressor. The oil is supplied by the oil pressure difference so that there is no oil pump, which makes sure the unit can work under the worst conditions.

1.4.5 The Throttle The throttle is a thermal expansion valve or an electronic expansion valve according to different cooling capacity. It can control the super heat of suction gas precisely to make sure the unit works efficiently under full load and part load conditions.

1.4.6 The Capacity Control The control system will change the output of the compressor with high precise valves when the cooling load changes. The output control can be 4-step (25%, 50%, 75% and 100%) or

stepless. (NOTE: This part is only suitable for HANBELL

® compressor. If another brand compressor is in use,

please refer to the instructions of the compressor.)

Fig 1.8 The Compressor Structure

Chilled water in

Liquid in

Gas out

Chilled water out

LSBLG/MC IOMM

Item Part Name Item Part Name Item Part Name

1 Suction filter 7 Discharge port bearing 13 Capillary

2 Refrigerant gas 8 Discharge pipe 14 Electronic valve (start) SV1

3 Motor 9 Refrigerant gas (with oil) 15 Electronic valve (for 50%) SV3

4 Oil filter 10 Lubricant oil 16 Electronic valve (for 75%) SV3

5 Suction port bearing 11 Filter of oil separator 17 Slider

6 Rotors of compressor 12 Refrigerant gas

Table 1.1 Part Name of the Compressor

Valve

Load SV1 SV2 SV3

100% off off Off

75% off on off

50% off off On

25% (Start) on off off

Table 1.2 Working Schedule of the Electronic Valves of 4-step Output Control

1.4.7 The Refrigerant

The LSBLG/MC series screw chiller uses the R134a Environmentally friendly refrigerant.

1.4.8 The Lubricant Oil The LSBLG/MC series screw chiller uses the special compressor lubricant supplied by

HABELL® which brand is: HBR-B04

(NOTE: This part is only suitable for HANBELL® compressor. If another brand compressor is in use,

please refer to the instructions of the compressor.)

1.4.9 Oil Separator The oil separator is inside the compressor.

1.4.10 Refrigerant Filter There is a filter installed inside the suction port the compressor for preventing the impurities in the circuit pipe to go inside the compressor.

LSBLG/MC IOMM

2. Safety Instructions Before the unit start, all stuffs who responses for the commissioning and maintenance should read the instructions very carefully to make clear about all the working specifications. The design of the unit includes the convenience of the installation, start, running and maintenance. As long as running under the design conditions, the unit can provide the safe and reliable service. If some special factors are ignored such as running pressure, electrical components, voltage and installation position, the operation and maintenance of the unit will be very dangerous. This manual is arranged according with the normal operation sequence of the unit. During all the operations, the operator should read, understand and obey correlative instructions in the manual and the safety stickers on the unit or components.

2.1 Installation Safety Instructions The installation should be carried out following the installation instructions. When arrives in the site, the unit should be checked carefully if there is any damage

especially the components and the pipes of refrigerant circuit, or if there is some part missing according to the packing list. Once the damage or something missing is found, please contact the transportation company for compensation.

If the unit is not in right installation position, never remove the package or the base. Move the unit at the right position and direction and rig the unit at only the signed rigging holes.

When rig the unit, please choose suitable cables and rig it according to the rigging drawings and instructions.

Before the unit start, please check the voltage and frequency if they are suitable for the unit normal running.

If any of above rules is broken, damage and personal injury may occur.

2.2 Maintenance Safety Instructions

NEVER cover or shut off any of the safety device such as the valves on water system and the refrigerant system. Before the unit start, please make sure the valves installed correctly.

Be sure the refrigerant won’t get out from the safety valves and keep the installation room ventilated well.

High concentration of refrigerant vapor is harmful to the human body will lead to arrhythmia, unconsciousness or even death. It is heavier than air, and will reduce the amount of oxygen inhalation of human, and also irritate the eyes and the skin.

The operation of the electrical parts and refrigeration parts should be carried out by authorized people who know well about the installation of the unit.

All welding should be carried out by qualified professionals. Check the leakage termly. Once a leakage is found, it should be fixed immediately. Never maintain the unit when it is electrified. When fix the electrical parts, at first cut off

the main power supply. Important： All protection devices should be checked at least once a year. If the working conditions are

worse, this frequency should be increased.

2.3 Repairing Safety Instructions

To avoid the damage to the unit and human hazard, all installed parts should be maintained by special stuffs. Once there is a faulty or leakage, the unit should be fixed immediately by authorized technical persons. After maintenance, all the safety devices

LSBLG/MC IOMM

should be checked. When a leakage occurs, all the refrigerant should be got out. After the leakage point is

fixed, fill the system with enough R134a refrigerant which is marked on the rating label. If the leakage occurs on some parts on the unit which can be isolated, it is no need to get all the refrigerant out.

Before fill the refrigerant, make sure the type is R134a. Otherwise the unit would be damaged or even destroyed.

If charge the lubricant while maintenance, please make sure the model of it is the correct one mentioned in the specifications.

DO NOT try to make the oxygen into the pipe system of the unit because there will be drastic reactions between the oxygen and the grease inside the pipes.

DO NOT make the unit run more than its maximum working pressure. DO NOT check leakage with air but refrigerant gas or dry nitrogen. NEVER cut any refrigeration pipes or components with electrical welding cutting or flame

cutting unless there is no refrigerant gas or liquid. There will be poison gas if the refrigerant contact with the flame. So there should be some

protection devices such as fire extinguishers for accident. To avoid the refrigerant liquid touch on skin or inside the eyes, please be sure to wear

protection glasses. Use soap and water to get rid of the refrigerant on the skin. If the refrigerant goes into the eyes, wash the eyes again and again, and go to the hospital in time.

DO NOT heat the vessel with flame or steam, or there will be dangerous extra high pressure. If the refrigerant has to be heated, you can only use warm water to heat the vessel.

When the unit is running or under some pressure, NEVER try to remove any seal cover or connector. Any time you want to operate some valves which can make the unit inside connect to the atmosphere, be sure there is no pressure inside the unit.

When some rust, dust, dirties or fouling is found inside the valves, or mechanical damage to the valves, DO NOT try to fix them or re-calibrate them. You should change them if possible.

NOTE: DO NOT walk on the pipes of the unit to avoid refrigerant leakage caused by damage pipes. DO NOT climb the unit. If you have to, please use safety flat or falsework. Be careful when rig some parts with a mechanical crane. Even a light part, there may be some

risk of losing balance or sliding down. If some parts need to be changed, please contact the dealer or Midea company for help. There

is no spare part as accessory if no special comment. Before install the filter and flow switch on the water system, please shut off the inlet and outlet

valve to drain out the water inside the unit. Check the connector of valves, pipes to see if there is corrosion, block, leakage or damage.

2.4 Electrical Safety Instructions

Only these qualified professionals can operate the electrical components. Before any operation to the electrical parts, the power supply to the unit should be cutoff at firstly. NOTE: Electrical Shock: Even the main power supply is cutoff, some parts in the control system may

be still electrified because they are supplied by isolated power source. Burn: The current will make electrical components heat, so be careful when touch the power

line, control cable, cable shell, cable sleeve, cover of wiring box and the motor shell. Even the unit is shut down, the power lines are still electrified as long as the main breaker is on.

Please refer to the circuit diagram and use safe operation. The unit is in accordance with the present electromagnetic compatibility standard. If you have to deal with the PCB, please wear a pair of antistatic gloves to avoid the

LSBLG/MC IOMM

components to be exposed under high voltage. When change the PCB, the new one should be inside the antistatic bag until it is to be installed in position.

3. Installation

3.1 Installation Environment

LSBLG/MC series screw chiller is only for indoor installation. Please do not install it at anywhere there is a flood risk which may lead to electric leakage or short circuit. Also do not install the unit in room where the direct sunlight can touch.

The installation environment should be ventilated well in case of the human hazard caused by refrigerant leakage.

There should not be inflammable gas, flame, heavy vibration or other objects do harm to the mechanical parts or electrical components.

The installation room should have suitable humidity and temperature. There should be enough support points in the installation position. There should be tough base to bear the weight of the unit and enough fixing devices.

3.2 Acceptance

Before the unit into the site, be sure the unit and the accessories are in accordance with your order requirement and the model no. is same as the rating label.

Please check if the all parts of the unit and the accessories are complete. If something is missing, please contact Midea or authorized dealer immediately.

3.3 Rigging

DO NOT make the unit impact the ground to avoid the damage when move the unit into the installation room.

Use some rollers under the unit to move the chiller. Please refer to Fig 3.1 for rigging superposition-type single-compressor unit. It’s

applicable for following models: LSBLG115/MC, LSBLG170/MC and LSBLG275/MC.

Fig 3.1 Rigging sketch for superposition-type single-compressor screw chiller

LSBLG/MC IOMM

Please refer to Fig 3.2 for rigging the juxtaposition-type single-compressor unit. It is

suitable for LSBLG350/MC, LSBLG420/MC, LSBLG560/MC and LSBLG650/MC。

Fig 3.2 Rigging sketch for juxtaposition-type single-compressor screw chiller

Please refer to Fig 3.3 for rigging the dual-compressor unit. It is suitable for LSBLG700/MC, LSBLG840/MC, LSBLG975/MC, LSBLG1120/MC and LSBLG1300/MC.

Fig 3.3 Lifting sketch map for dual-compressor screw chiller

Safety Instructions To prevent electric box and the body of machine from being damaged while lifting,

please use groove steel for supporting. Make sure the steel wire is on the right position that indicated in the sketch map while

lifting. Make sure the steel wire is fixed on the 4 hooking holes on the pedestal by hooks

while lifting. Please find the dimension and the weight data in product manual, and then select

LSBLG/MC IOMM

right steel wires.

3.4 Installation Process

3.4.1 Foundation There should be some barrel-drains around the foundation for drain the water

conveniently. There should be absorbers between the unit and the foundation to cut off the transferring

of noise and vibration. Be sure the unit is even and you can add anti-vibration base if necessary.

Fig 3.4 Sketch of Installation Foundation

Model

Dim.

LSBLG***/MC

115 170 275 350 420 560

D(mm) 1400 1600 1600 1600 1800 1800

E(mm) 520 520 570 1250 1250 1250

Model

Dim.

LSBLG***/MC

650 700 840 975 1120 1300

D(mm) 1800 1800 2000 2000 2000 2000

E(mm) 1350 1440 1400 1440 1540 1640

Table 3.1 Installation Dimension Table

LSBLG/MC IOMM

3.4.2 Fixation of unit

Fig 3.5 Type 1 Fig 3.6 Type 2

Note:

(1) For type 1, please reserve the installation holes for foundation bolt on the basement

according to installation basement diagram.

(2) For type 2, reserve the holes for the installation of absorber on the basement.

3.4.3 Service Space

Fig 3.7 Service Space

Table 3.2 LSBLG/MC Service Spaces

Service Space

A ≥700 Front

B ≥600 Rear

C ≥2000 Left

D ≥3500 (Single-compressor)

≥5000 (Dual-compressor) Right (Water Pipe Connection)

E ≥600 Top

Absorber

Basement

Washer

Foundation bolt

Iron plateThickness>2mm

Bottom of unit

Nut cap

M20（Refer to practical situation

for the length of bolt.）

Absorber

Foundation bolt

Washer

Installation hole

Nut cap

Bottom of unitM20（Refer to practical situation

for the length of bolt.）

LSBLG/MC IOMM

3.5 Installation of Other Systems 3.5.1 Installation of Water System The valves on water inlet/outlet pipes should be well-insulated to reduce the energy loss

and to prevent condensing. Water flow switches should be installed on water outlet side of evaporator and condenser

to ensure enough water in pipeline. The water flow switches are interlocked with compressor; otherwise it may cause chilled water inside evaporator to freeze, low pressure on gas side, bad oil return, overpressure in condenser or high-pressure protection due to lack of water (It is suggested that using water switch manufactured by Shanghai Fengshen Refrigeration controller co. Ltd. The model is FSF50P-1, 3# target lamina, two G1 connectors were provided as our standard accessories).

In close loop water system, to diminish the impact on water pipe because of the expansion or contraction of water volume and to avoid the influence caused by supplementing water pressure, water return side should be fitted with an expansion water tank whose water surface should be at least 1m higher than the highest point of water pipe system.

Chilled water pump of water chiller should be installed on the inlet of evaporator. In order to expel the air from water system, install an automatic discharge valve on the

highest place of local water pipe and the horizontal pipe should be up tilted for about 1/250 degree. Do scaling and cleaning on water pipeline before installation and the unit should be maintained clean before operation.

Shockproof hose should be installed on water inlet and outlet to diminish the vibration which may be transmitted to indoor side.

It’s suggested to install a thermometer and a pressure gauge on the inlet and outlet of unit, which will provide convenience for daily check.

During the operation of water chiller, water or other secondary refrigerants inside the evaporator should not less than 70% of rated flow to avoid accident.

The accessories of water inlet pipe and outlet pipe should be installed with sockets to easily separate them from water pipes when doing maintenance.

Do not load the weight of water pipe onto the unit. When connecting water inlet/outlet with corresponding water pipe, soft connection such as rubber joint should be used to avoid the transmission and inter-disturbance of vibration and noise.

Refer to Fig 3.8 for the piping of condenser. Refer to Fig 3.9 for the piping of evaporator.

Wat

er c

hil

ler

Con

den

ser

F

a b cd e f g

h j

ikb

Water inlet,

condenser

Water outlet,

condenser

Cooling tower

Fig 3.8 Piping of Condenser

a. Shockproof joint; b. Temperature sensor; c. Butterfly valve; d. Pressure gauge; e. Thermometer; f. Platinum resistance thermometer; g. Automatic discharge valve; h. Water pump; i. Drain valve; j. Y-filter; k. Water flow switch (Note: All the fittings of water pipe and water flow switch are provided by the users.)

LSBLG/MC IOMM

F

c de f g

h j

ikba

aW

ate

r chil

ler

Evapora

tor Water inlet,

Evaporator

Water outlet ,Evaporator

Water supply

Water outlet

Water return

Fig 3.9 Piping of Evaporator

a. Temperature Sensor; b. Pressure thermostat; c. Shockproof joint; d. Butterfly valve; e. Pressure gauge; f. Thermometer g. Automatic discharge valve; h. water pump; i. Drain valve; j. Y-filter; k. Water flow switch (Note: All the fittings of water pipe and water switch are provided by the users.)

There should be a water flow switch on the horizontal water out pipe of each condenser and evaporator. The distance from the switch to each end of the horizontal pipe should be 5 times of the diameter of the pipe. Adjust the lamina according to the pipe specification (please refer to the manual of the water flow switch). Connect the switch to the terminals inside the control cabinet (please refer to the circuit diagram).

WARNING: PLEASE CONFIRM THE WATER FLOW DIRECTION; THE WATER FLOW SWITCH IS JUST A SAFETY DEVICE AND CANNOT BE USED FOR CONTROL THE UNIT.

Water Quality

The quality of cycling water should be in accordance with relevant standard and the design fouling factor of the evaporator and the condenser.

The cooling water is open type cycling system and its PH value should be between 7.0 and 9.0 (alkalescent ). The quantity of calcium ion should be less than 200 mg/l.

Anti-freezing Protection

When the ambient temperature may go down below 0℃ where the unit works, it is

suggested to add a anti-freezing device to protect the normal working of the unit. If the unit stops and there is no any anti-freezing device, all the water inside the evaporator and condenser should be drained out. If there is a damage caused by ice from the water inside the heat exchangers, Midea will not be response for it.

3. 5.2 Electrical System The Power Supply The voltage of power supply should be constant. Taking all factors causing voltage

drop into account, the working voltage of unit should be within±10% of rated value.

Too high or too low voltage will have bad effect on the unit. The voltage difference between phases should not higher than 2% of rated value and

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LSBLG/MC IOMM

the current difference between the highest and the lowest phase should be lower than 3% of rated value, otherwise the compressor may be overheated.

The frequency of power supply should be within ±2% of rated value.

The lowest starting voltage should be higher than 90% of rated value. Too long power supply cable may disable the compressor to start; therefore, the

length of the cable wire should be proper enough to ensure that the voltage drop between two terminals is lower than 2% of rated value. In case the length cannot be changed, the cable size should be thickened.

Wiring work between power supply and the unit should be strictly done according to Electric Standard and be well insulated which is measured by ohmmeter of 500V. The

insulation resistance should be higher than 10MΩ.

The parameters of running current and input power on the nameplate are measured under standard working condition, which may differ due to actual load on system and actual temperature of chilled water. Hence please select the power supply, transformer, non-fuse breaker and the capacity of wiring in the light of possible worst working condition.

WARNING: THE UNIT SHOULD HAVE SPECIAL ISOLATED CIRCUIT TO WORK. ONLY THE QULIFIED STUFF CAN OPERATE OR USE THE ELECTRICAL COMPONENTS. THE CAPACITY LOSS OF THE CIRCUIT OR INCORRECT OPERATION MAY LEAD TO ELECTRICAL SHOCK OR FIRE HAZARD.

Wiring Specification

Prepare the wiring plan according to the set overload conditions of the unit. NEVER choose the wire specification by the running conditions comes from the rated output of the motor or other individual specification because it is very dangerous. Please refer to the table 3.3 to choose the recommended wiring specification.

Model Cable Type Min. cross area of each phase cable mm

2

=(n×min. Cross area of each cable)

LSBLG 115/MC BVR 50 LSBLG 170/MC BVR 50 LSBLG 275/MC BVR 50 LSBLG 350/MC BVR 70 LSBLG 420/MC BVR 95 LSBLG 560/MC BVR 120 LSBLG 650/MC BVR 150

LSBLG 700/MC BVR 2×70

LSBLG 840/MC BVR 2×95

LSBLG 975/MC BVR 2×95

LSBLG 1120/MC BVR 2×120

LSBLG 1300/MC BVR 2×120

Table 3.3: LSBLG/MC Cable Specifications

The installers are response for the wiring specification according to the real electrical conditions of the site. Above table and suggest are only for reference (The min. cross area of each phase cable means the min. cross area of the cable goes along the bridge supporter, not goes through the wiring pipes.) After choosing the cable specification, the wiring work can be carried out. The installer should make the wiring work conveniently and make detailed instructions of any necessary change.

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LSBLG/MC IOMM

WARNING: THE EXTERNAL WIRING PLAN SHOULD OBEY THE RULES. INCORRECT WIRE SPECIFITION WILL LEAD TO HEAT AND FIRE HAZARD.

Reliable Connection

Make the wiring connection reliable in case of wrong phase or phase loss. Avoid external force on the wires. After connection, check again to ensure there is no relaxing or wrong connection.

WARNING: THE WIRES MUST BE THE APPOINTED AND IT IS SHOULD BE SURE THE CONNECTION IS RELIABLE AND SAFE. NEVER ADD EXTERNAL FORCES ON THE CONNECTION TERMINALS. IF THE CONNECTION OR FIXING IS INCOMPLETE, IT WILL LEAD TO HEAT OR FIRE.

Grounding

For safety and according to the electrical work rules, the case of unit should be well and reliably grounded to avoid electric shock.

Only the qualified professional can carry out the grounding work. The grounding terminals are inside the control cabinet.

NOTE：

NEVER CONNECT THE GROUNDING WIRE TO GAS PIPES, WATER PIPES, LIGHTNING ROD OR TELEPHONE WIRE.

GAS PIPE: GAS LEAKAGE WILL LEAD TO EXPLOSION OR FIRE. WATER PIPE WILL DAMAGE THE INSULATION OF THE WIRES.

LIGHTNING ROD OR TELEPHONE WIRE: IF THERE IS A LIGHTNING, THE

GROUNDING VOLTAGE WILL INCREASE RAPIDLY.

Installing the Power Breaker

Install one power breaker for each of the units.

To eliminate the damage to transformer, wiring and the like electric device caused by

short-circuit and to control the ON/OFF of compressor separately, every leadin of

power supply cable should be equipped with non-fuse breaker with a certain capacity.

See the following chart:

NFB

TSR

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LSBLG/MC IOMM

Fig 3.10 Wiring Diagram of None-fuse Breaker

WARNING: THERE SHOULD BE POWER BREAKER INSTALLED ACCORDING TO THE TECHNICAL STANDARD OF ELECTRICAL EQUIPMENT. THE LONG INSTALLING DISTANCE WILL LEAD TO ELECTRICAL SHOCK. EACH UNIT SHOULD HAVE ONE BREAKER. NEVER MAKE TWO OR MORE UNITS SHARE ONE BREAKER, OR THERE MAY BE ELECTRICAL SHOCK OR FIRE HAZARD.

This work should be carried out after covering the components inside the control cabinet.

DO NOT damage the bolts while wiring. The other components such as warning sign and fuse are inside the control cabinet

and they are not supposed to be touched. After installing the breaker, clear the tools and remainder wires.

WARNING: NEVER INSTALL ANY POWER CABLE BETWEEN THE UNITS IN CASEOF FIRE HAZARD.

Water Flow Switch The wiring of water flow switch should be carried out by the users. Without water flow switch, the unit cannot start and run normally. See the following chart for wiring: (Note: the wire is shielded wire of 0.75mm2.) (Note: The wiring may differ in different models, please refer to circuit diagram attached to this unit for details.)

Fig 3.11 Wiring Diagram of Water Flow Switch

Temperature Sensor Chilled water temperature sensor is provided as standard accessories. Users should remove the 10K resistance or direct connection wire before wiring. The unit cannot start and run normally unless there are chilled water temperature sensor or 10K resistance or direct connection wire. Please refer to the following diagram: (Note: The wiring may differ in different models, please refer to wiring diagram attached to this unit for details.)

207207202202

1 2 3 4

Wate

r sw

itch,

coole

d w

ate

r

Wate

r sw

itch,

chil

led w

ate

r

Shielded wire

terminal

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LSBLG/MC IOMM

Fig 3.12 Wiring Diagram of Water Temperature Sensor

The Main Power Supply The wiring of power supply is shown below: (Note: In order to prevent dust from entering electric box, users should install a dustproof cover in leadin of electric wire or use a wire casing to seal the leadin after wiring.)

A B C

Green

Yellow

Yellow

Green

RedRed

3 ～380V 50HzTerminal block TC4004

Fig 3.13 Main Power Wiring Diagram

For detailed information, please refer to the wiring diagrams that attached to this manual.

Note: after wiring, please add a anti-dust shell to cover the inlet of the main power cables or seal the inlet to avoid the dust to go inside the wiring cabinet.

Water Pump and Cooling Tower Electromagnetic switches for cooling water pump, chilled water pump and cooling tower fan motor should be connected with the circuit of unit. The electromagnetic switches

Out

let

chil

led

wat

er t

emp.

sen

sor

Inle

t ch

ille

d w

ater

tem

p. s

enso

r

Junc

tion

, shi

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Main control board

LSBLG/MC IOMM

above installed on site by the installer are not contained in electric box of the unit.

4. Running

4.1 Running Range

Fig 4.1 Running Range of LSBLG/MC Series R134a DX Type Screw Chillers

Note: The area around by the quadrangle is the full-load range of the chillers; When the chiller is running at full-load and standard water flow rate, the temperature

difference between the water inlet and outlet of the condenser and the evaporator is 5℃;

When the cooling water entering temperature is lower than 20℃, it is necessary to add a

by-pass valve at the cooling water pipe system to maintain the condensing pressure or

heat the cooling water to more than 20℃

If the -10℃~3℃ chilled water is required, we can make a special design as non-standard

low-temperature chiller.

15

20

25

30

35

40

45

0 5 10 15 20

蒸发器出水温度（℃）

冷凝器出水温度（

℃）

Water Leaving Temperature of Evaporator (℃)

Wat

er L

eavi

ng

Tem

per

atu

re o

f C

on

den

ser

(℃)

LSBLG/MC IOMM

4.2 Water Flow Rate Range

Flow rate

Model

Chilled Water Flow Rate Range

(m3/h)

Cooling Water Flow Rate Range

(m3/h)

LSBLG 115/MC 14-24 16.8-28.8

LSBLG 170/MC 20.3-34.8 24.5-42

LSBLG 275/MC 32.9-56.4 39.9-68.4

LSBLG 350/MC 42-72 51.1-87.6

LSBLG 420/MC 50.4-86.4 60.9-104.4

LSBLG 560/MC 67.2-115.2 80.5-138

LSBLG 650/MC 78.4-134.4 93.8-160.8

LSBLG 700/MC 84.7-145.2 102.2-175.2

LSBLG 840/MC 100.8-172.8 121.1-207.6

LSBLG 975/MC 117.6-201.6 140.7-241.2

LSBLG1120/MC 135.1-231.6 161.7-277.2

LSBLG1300/MC 156.8-268.8 187.6-321.6

Table 4.1 Water Flow Rate Range of LSBLG/MC

Instruction:

The given water flow range is for ensuring the chiller can work under normal working conditions.

If the water flow rate is too low and when the cooling load changes, the water temperature will change rapidly, which will make the compressor start and stop frequently.

If the water flow rate of the evaporator is required very low, we can provide 3-pass or 4-pass chiller.

If the water flow rate is required very high, it will take too long to cool down the water and the pressure drop of the evaporator will be too high. So we can provide single-pass design.

Note: The control system of LSBLG/MC screw chiller contains the chain control of the cooling

tower and the pumps but it is only for ON/OFF, not variable. Above flow data range means the chiller works under some constant water flow rate.

If the variable primary flow system is in use, the unit can be self-adjusted to fit it. But the water flow change rate should not be more than 30% per minute.

LSBLG/MC IOMM

4.3 Specifications

Table 4.2 Specifications of R134a DX Type Screw Chiller (Single-Compressor)

Unit Model LSBLG

115/MC

LSBLG

170/MC

LSBLG

275/MC

LSBLG

350/MC

LSBLG

420/MC

LSBLG

560/MC

LSBLG

650/MC

Nominal

Cooling Capacity

RT 32.7 47.8 78.2 99.8 119.4 159.2 184.8

kW 115 168 275 351 420 560 650

Power Supply 380V/3N/50Hz (400/415V as option)

Power input kW 24 35 57 72 84 112 127

Rated current A 41 60 97 123 143 191 221

Compressor

Type / Semi-hermetical single screw compressor

Starter Mode / Y-Δ

Energy adjusting % 25%、50%、75%、100% four step control（25%-100% Stepless Control, Optional）

Quantity / 1 1 1 1 1 1 1

Refrigerant Type / R134a

Charge volume kg 40 50 60 90 100 120 150

Evaporator

Type / Direct Expansion Evaporator

Quantity / 1 1 1 1 1 1 1

Flow Rate m3/h 20 29 47 60 72 96 112

Pressure Drop kPa 60 81 81 74 83 83 85

Inlet/Outlet mm DN80 DN100 DN100 DN125 DN125 DN125 DN150

Condenser

Type / Tube-and-shell condenser

Quantity / 1 1 1 1 1 1 1

Flow Rate m3/h 24 35 57 73 87 115 134

Pressure Drop kPa 12 23 23 16 21 31 42

Inlet/Outlet mm DN80 DN100 DN100 DN125 DN125 DN125 DN150

Unit

Dimension

Length mm 2940 2940 2970 2995 3600 3600 3600

Width mm 800 800 850 1350 1380 1390 1450

Height mm 1740 1770 1880 1480 1540 1660 1720

shipping Weight kg 1330 1640 1895 2480 3000 3320 4100

Running Weight kg 1480 1790 2045 2780 3300 3620 4500

NOTE:

（1）The performance data is based on the standard conditions: Chilled water in/out temperature is 12/7℃;

and cooling water in/out temperature is 30/35℃;

（2）The water side design working pressure of the condenser and the evaporator is 1.0MPa. If you want it

to be higher than 1.0 MPa, please make a special comment in the order.

（3）The fouling factor of the evaporator and the condenser is 0.086 m2·℃/kW.

（4）If the working conditions change, a new speciation will be provided.

LSBLG/MC IOMM

Table 4.3 Specifications of R134a DX Type Screw Chiller (Dual-Compressor)

Unit Model LSBLG

700/MC

LSBLG

840/MC

LSBLG

975/MC LSBLG1120/MC LSBLG1300/MC

Nominal

Cooling Capacity

RT 199.6 238.8 276.9 318.5 369.6

kW 702 840 974 1120 1300

kcal/h

603,720 722,400 837,640 963,200 1,118,000

Power Supply 380V/3N /50Hz (400/415V as option)

Power input kW 72×2 84×2 96×2 112×2 127×2

Rated current A 123×2 143×2 165×2 191×2 221×2

Compressor

Type / Semi-hermetical twin screw compressor

Starter Mode / Y-Δ

Energy

adjusting % 25%、50%、75%、100% four step control（25%-100% Stepless Control,Optional）

Quantity / 2 2 2 2 2

Refrigerant

Type / R134a

Charge

volume kg 85×2 95×2 110×2 120×2 150×2

Evaporator

Type / Dry Expansion Evaporator

Quantity / 1 1 1 1 1

Flow Rate m3/h 121 144 168 193 224

Pressure Drop kPa 85 87 87 86 86

Inlet/Outlet mm DN150 DN150 DN150 DN150 DN200

Condenser

Type / Tube-and-shell condenser

Quantity / 1 1 1 1 1

Flow Rate m3/h 146 173 201 231 268

Pressure Drop kPa 40 45 30 38 40

Inlet/Outlet mm DN150 DN150 DN150 DN150 DN200

Unit

Dimention

Length mm 3800 4400 4400 4800 4800

Width mm 1570 1500 1540 1670 1740

Height mm 1720 1690 1740 1740 1865

shipping Weight kg 4400 5220 6050 6130 6600

Running Weight kg 4800 5620 6380 6580 7200

NOTE:

（1）The performance data is based on the standard conditions: Chilled water in/out temperature is 12/7℃;

and cooling water in/out temperature is 30/35℃;

（2）The water side design working pressure of the condenser and the evaporator is 1.0MPa. If you want it

to be higher than 1.0 MPa, please make a special comment in the order.

（3）The fouling factor of the evaporator and the condenser is 0.086 m2·℃/kW.

（4）If the working conditions change, a new speciation will be provided.

LSBLG/MC IOMM

Performance Table

Item

Model

Chilled

Water

Leaving

T ℃

Cooling Water Entering Temperature℃

25 28 30 32 35

Capacity kW

Power Input kW

Capacity kW

Power Input kW

Capacity kW

Power Input kW

Capacity kW

Power Input kW

Capacity kW

Power Input kW

LSBLG115/MC

4 107 21.9 103.8 22.7 101 23.4 99 24.2 95 25.5

5 112 22.1 108.1 22.9 106 23.6 103 24.4 99 25.7

6 116 22.3 112.6 23.1 110 23.8 107 24.6 103 25.7

7 121 22.4 117.1 23.3 115 24 112 24.8 107 25.7

8 126 22.6 121.9 23.5 119 24.2 116 25.0 112 26.1

9 131 22.8 126.7 23.7 124 24.4 121 25.2 116 26.6

LSBLG170/MC

4 158 32.0 152.4 33.2 149 34.1 145 35.3 139 37.1

5 164 32.2 158.8 33.4 155 34.4 151 35.6 145 37.5

6 171 32.5 165.4 33.7 162 34.7 158 35.9 151 37.8

7 178 32.8 172.0 34.0 168 35 164 36.2 158 38.1

8 185 33.0 179.0 34.3 175 35.3 171 36.5 164 38.4

9 192 33.2 186.0 34.5 182 35.6 177 36.7 171 38.7

LSBLG275/MC

4 258 52.1 249.6 54.1 244 55.7 238 57.5 228 60.6

5 269 52.6 259.9 54.5 254 56.1 247 57.9 238 61.1

6 280 53.0 270.7 54.9 264 56.5 258 58.4 248 61.6

7 291 53.4 281.5 55.4 275 57 268 58.9 258 62.1

8 303 53.8 293.0 55.8 286 57.5 279 59.4 269 62.6

9 315 54.2 304.4 56.3 298 57.9 290 59.8 279 63.1

LSBLG350/MC

4 330 65.8 318.6 68.3 311 70.3 303 72.6 291 76.5

5 343 66.3 331.8 68.8 324 70.9 316 73.2 303 77.1

6 357 66.9 345.6 69.4 337 0.0 329 73.8 316 77.8

7 371 67.4 359.3 69.9 351 72 342 74.4 329 78.5

8 387 67.9 374.0 70.5 365 0.0 357 75.0 343 79.1

9 402 68.4 388.7 71.1 380 73.1 371 75.6 357 79.7

LSBLG/MC IOMM

(Continue)

Item

Model

Chilled

Water

Leaving

T ℃

Cooling Water Entering Temperature℃

25 28 30 32 35

Capacity kW

Power Input kW

Capacity kW

Power Input kW

Capacity kW

Power Input kW

Capacity kW

Power Input kW

Capacity kW

Power Input kW

LSBLG420/MC

4 394 76.8 381.1 79.7 372 82.0 363 84.7 348 89.3

5 411 77.4 397.0 80.3 388 82.7 378 85.4 363 90.0

6 427 78.0 413.5 80.9 404 83.3 394 86.1 378 90.8

7 444 78.6 430.0 81.6 420 84 410 86.8 394 91.5

8 462 79.2 447.5 82.2 437 84.7 427 87.5 410 92.3

9 480 79.8 465.0 82.9 452 85.4 444 88.2 427 93.0

LSBLG560/MC

4 526 102.3 508.2 106.2 496 109.2 484 112.8 464 119.0

5 547 103.1 529.2 107.0 517 110.2 504 113.7 484 120.0

6 570 103.9 551.3 107.9 538 111.1 525 114.7 505 121.0

7 593 104.7 573.4 108.8 560 112 546 115.6 525 122.0

8 617 105.5 596.7 109.6 583 112.9 569 116.6 547 123.0

9 641 106.3 620.0 110.4 606 113.7 591 117.5 569 123.9

LSBLG650/MC

4 614 116.1 593.6 120.4 579 123.9 565 127.9 542 135.0

5 639 117.0 618.2 121.4 604 125.0 589 129.0 565 136.1

6 666 117.9 643.9 122.4 627 126.0 613 130.1 589 137.2

7 692 118.8 669.7 123.3 650 127 638 131.2 613 138.3

8 720 119.7 696.9 124.3 679 128.0 664 132.3 639 139.4

9 748 120.6 724.2 125.3 708 129.0 691 133.3 664 140.6

LSBLG700/MC

4 659 131.7 637.1 136.6 622 140.5 606 145.2 582 153.1

5 686 132.7 663.6 137.6 648 141.7 632 146.5 607 154.3

6 715 133.7 691.1 138.8 675 0.0 658 147.6 633 155.6

7 743 134.7 718.7 139.9 702 144 685 148.7 658 157.0

8 773 135.8 748.0 141.0 731 0.0 713 150.0 686 158.2

9 803 136.8 777.4 142.1 760 146.3 741 151.2 713 159.4

LSBLG/MC IOMM

(Continue)

Item

Model

Chilled

Water

Leavin

g T ℃

Cooling Water Entering Temperature℃

25 28 30 32 35

Capacity kW

Power Input kW

Capacity kW

Power Input kW

Capacity kW

Power Input kW

Capacity kW

Power Input kW

Capacity kW

Power Input kW

LSBLG840/MC

4 789 153.6 762.3 159.4 744 164.0 726 169.4 696 178.6

5 821 154.8 794.0 160.6 775 165.4 756 170.8 726 180.0

6 855 156.0 827.0 161.9 808 166.7 788 172.2 757 181.5

7 889 157.2 860.0 163.2 840 168 820 173.6 788 183.0

8 925 158.4 895.0 164.5 874 169.4 853 175.0 821 184.5

9 961 159.6 930.1 165.8 904 170.8 887 176.4 853 186.0

LSBLG975/MC

4 914 175.5 883.9 182.1 863 187.4 841 193.4 808 203.9

5 952 176.9 920.5 183.5 899 188.8 876 195.0 842 205.7

6 941 849.7 941.4 849.7 941 849.7 941 849.7 941 849.7

7 1031 179.5 997.1 186.4 974 192 950 198.4 913 209.1

8 941 849.7 941.4 849.7 941 849.7 941 849.7 941 849.7

9 1114 182.3 1078.4 189.4 1054 195.0 1028 201.5 989 212.5

LSBLG1120/M

C

4 1051 204.6 1016.4 212.4 992 218.4 967 225.6 929 238.0

5 1095 206.2 1058.5 214.0 1034 220.4 1008 227.4 968 240.0

6 1140 207.8 1102.6 215.8 1077 222.2 1050 229.3 1009 242.0

7 1185 209.4 1146.7 217.6 1120 224 1093 231.2 1050 244.0

8 1233 211.0 1193.4 219.2 1166 225.7 1138 233.1 1094 245.9

9 1281 212.6 1240.0 220.8 1212 227.4 1183 235.0 1138 247.8

LSBLG1300/M

C

4 1228 232.2 1187.2 240.7 1159 247.9 1130 255.8 1085 269.9

5 1279 234.0 1236.3 242.8 1207 249.9 1177 258.1 1131 272.2

6 1332 235.8 1287.8 244.7 1254 252.0 1227 260.2 1179 274.4

7 1384 237.7 1339.4 246.7 1300 254 1276 262.4 1227 276.6

8 1440 239.4 1393.8 248.6 1358 256.0 1329 264.5 1278 278.9

9 1496 241.1 1448.3 250.5 1415 258.1 1381 266.6 1329 281.1

LSBLG/MC IOMM

4.4 Check before Start Before the pre-check, please read the following instructions carefully for safety of the human and the unit. Also please following safety instructions in Chapter 2. If anything wrong is found before the pre-check, please contact Midea® immediately.

4.4.1 Electrical Part The following points should be confirmed before electrifying the unit for safety.

The insulation resistance of power-ground and phase-phase should be checked to be enough.

The connection of power supply cables should be correct without phase lack or wrong phase sequence. Check if the connection is released.

The grounding should be correct. Clean the inside of the control cabinet completely. The specification of the supply cables should be correct.

The voltage should be in 10% of the rated voltage, and the frequency should be 2% of the rated. Confirm that the voltage difference among the 3 phases should not be more

than 2% of the rated. The unit should be electrified to make the oil heater work for at least 8 hours before start

to avoid any problem and make the compressor runs stable. WARNING: MAKE THE UNIT GROUNDED RELIABLE, OR THERE WILL BE ELECTRICAL

SHOCK HAZARD. NEVER CONNECT THE GROUNDING WIRE TO THE GAS PIPES, WATER PIPES, LIGHTNING ARRESTOR OR TELEPHONE WIRES.

NEVER PUT ANY UNNECESSARY OBJECTS INSIDE THE CONTROL CABINET IN CASE OF ELECTRICAL SHOCK AND FIRE HAZARD.

CHECK THE POWER SUPPLY CAPACITY IF IT IS SUITABLE FOR THE UNIT. IF THE CAPACITY IS LESS THAN WHAT THE UNIT NEED, THERE WOULD BE FIRE HAZARD OR ELECTRICAL SHOCK.

4.4.2 Water System Check all the water pipe system to confirm the pipes connected to the evaporator and the

condenser and the water flow direction are correct. Check the installation of the temperature sensor of the entering water and leaving water

of the condenser and the evaporator to see if the connection is reliable and the temperature reading is correct.

Open all the water valves and start the pumps to check if there is leakage at connection flange and make the air out of the condenser and the evaporator.

Check the water side pressure drop of both heat exchangers. Check if the water flow switch and water pressure difference switch act correctly.

4.4.3 The Unit Check whether the lubricating oil in compressor has been heated for enough time which

is about 2~8 hours. (The time depends on ambient temperature, the lower the ambient temperature, the longer the heating time is.) The setting of oil heating time can be done on the touch screen.

Check whether there is sufficient water in chilled water circulating system as well as in cooling water system and open the water supplementing valve.

Check whether all the pipeline and handles of valves or switches are in proper position. Check whether the switches and components in distribution box are in normal state.

！

LSBLG/MC IOMM

Make sure the power supply and voltage are perfect. Check the pressure gauge of main unit. Usually, the pressure is between 7~10kgf/cm2G

when the indoor temperature is between 25℃~28℃.

4.5 Start the Unit 4.5.1 Normal Start and Stop Normal Start

(1) Start the fan motor of cooling tower. (2) Run the cooling water pump. (3) Run the chilled water pump (4) Start the compressor. (Caution: Keep a close watch on pressure gauge while starting the compressor. Stop it if there is any problem.)

Stop Procedure

Reverse to starting procedures. When the compressor stops, wait for at least 5 minutes before to stop chilled water pump, then stop cooling water pump and cooling tower fan motor by another two 5 minutes interval.

Precaution While Running

Electric

A. Check whether the voltage is normal after starting. B. Check whether all the switches of power supply have been closed. C. Make sure the power supply is normal after starting. Unit

A. Whether all the motors run normally. B. Make sure there is no abnormal noise while operation. C. Whether the circulating water pumps are working in good condition and the water pressure gauges are normal. D. Whether the high/low pressure gauges of compressor are normal. E. In case the protection switches of high/low pressure activated, eliminate the troubles before restart the unit.

4.5.2 Emergency Stop The red button on the door of the control cabinet is emergency stop switch. Press it when something is wrong, the unit will stop immediately. Rotate it anti-clockwise to reset it.

4.5.3 Running under Low Ambient Temperature The best entering cooling water temperature is 24℃～35℃. Too low temperature will make

the oil pressure be not enough so that the loading of the compressor will be more difficult and it may occur that the compressor cannot work under 100% load. If working under low oil pressure difference for a long time, the compressor will not be lubricated well, which will lead to shorter working life of the compressor. If running under low temperature is required, please be sure the entering cooling water

temperature is more than 20℃, or please increase the condensing pressure with following

method: By-pass control of cooling tower: control the quantity of the water into the cooling tower

with manual or automatically by-pass valve to ensure the temperature of the water going to the condenser.

LSBLG/MC IOMM

Adjusting the cooling water flow: maintain the entering cooling water temperature, and control the condensing temperature by reducing the water flow through the condenser.

4.6 PLC Operation Note: You will not be informed in advance if following interfaces are changed partly or fully, please refer to the real interface pictures.

4.6.1 Structure of PLC Control System

WORK STATE HISTORYWARNING &PROTECTION

WELCOME

MAIN

TRENDCURVE

PARAMETERCHECK

SETTING PAGE

PASSWORD

PARAMETERSETTING

Fig 4.3 Structure of PLC Control System

4.6.2 Welcome Page When the chiller system is electrified and the control system starts, WELCOME PAGE will be displayed on the touch screen as following picture

Fig 4.4 Welcome Page

LSBLG/MC IOMM

4.6.3 Main Page Press anywhere of the WELCOME page to get into the WORK STATE page of the system as

following：

Fig 4.5 Main Page

Main Page is used for displaying the main working parameters. The meaning of this page:

20yy/mm/dd HH:MM

Current Date and Time, Format:00YY/MM/DD Hr:Min

WARN Warning: when there is a warning, it will be high-lighted in the PARAMETER CHECK page. Press it to get into the WARNING page.

SYST SET. System Settings

PRMT CHCK Parameter Check: to check every parameter

CURT TRND Trend Curve: to check curves of every temperature

DATA REPT History Report: to check the history data of every temperature.

Alarm Alarm Indicator: it will be on when there is something wrong.

Chill WLT Chilled Water Leaving Temperature, ℃

Cool WET Cooling Water Entering Temperature, ℃

START / STOP button: If all the conditions are satisfied for running, the chiller system can be

started by pressing the START button on right of the screen. When the chiller is running, the START button will change to STOP button. If the condition is satisfied for stop when the chiller

system is running, you can press STOP button to stop it. (The word on the button is current

operable state)

The working state of chiller is displayed on the mid-upper area of the screen: initializing, standby, starting, running, pause, stop, protecting and etc. At the first time the chiller is electrified, it will start without delay. In other occasions, before start or stop the chiller, there will be a few minutes delay.

LSBLG/MC IOMM

If the condition is not suitable for start or stop, when you press START/STOP button, there will

show a warning box with reasons for not start or stop on the touch screen. Press OK to close

the box.

If the temperature of outlet chilled water is lower than the set temperature 2℃ , the

compressor will stop working, which will be displayed PAUSE state. If the compressor stops due to a fault, it will be displayed that the chiller system is in fault protection state. Press the 5 buttons on the left and the lower of the screen, you can get into relevant pages (Parameter Setting Page needs password). The state bar on the right screen indicates load percent of the unit.

Press button to enter help page on which there are some simple operation instructions.

Fig 4.6 HELP page

Press MAIN button to close this page.

4.6.4 System Setting

1．Press button on the main running state page, there will show a password keypad.

Input the password to enter the user settings page shown as following:

LSBLG/MC IOMM

Fig 4.7 User Setting Page Fig 4.8 Password Input Page

In this page the user can choose Local or Remote control. The word in the button means the

current control mode of the unit. (if it sais Local, then the unit can be only controlled manually;

if it sais Remote, then the unit can be only controlled by remote directives.)

If you want to set some temperature (only when the compressor stops), just press the relevant value box. A keypad for input appears. You need to input the value according to the upper referenced format #~#### (if the value you input exceeds this range, it will be invalid)

and then press ENT to confirm or press ESC to cancel (if it is cancelled, the keypad for input

will disappear). According to the specifications of this chiller system, the minimum chilled

water outlet temperature is 3~4℃, and the relevant temperature for recovering from pause

should be at least 8℃ higher than this data.

Press button to get into Time Setting page. In this page, user can set the date and time to current.

Fig 4.9 Time Setting

There are input box for year, month, day and time. If the date and time is to be set, 4 boxes should be all input. If you want to set date or time (only when the compressor stops), just press the relevant value box. A keypad for input appears. You need to input the value according to the upper referenced format #~#### (if the value you input exceeds this range, it

will be invalid) and then press ENT to confirm or press ESC to cancel (if it is cancelled, the

keypad for input will disappear).（For Time setting, you should input a dot between the hour

value and the minute value）. After input, press button to confirm. Press button

LSBLG/MC IOMM

to Main page.

Press button to set the water system.

Fig 4.10 Water System Setting

Cool Fan Cooling Tower Fan

Cool PP Cooling Water Pump

Chill PP Chilled Water Pump

When the unit is standing-by, press the relevant button to start or stop the relevant equipments. This function is for starting the water system before start the unit, only for commissioning the water system.

Press button to back to User Setting Page.

4.6.5 Parameter Check

Input button on the main page to go into the Parameter Check Page as following

picture:

Fig 4.11 Parameter Check Page

LSBLG/MC IOMM

Fig 4.12 Output Page

Legend:

Cool Fan Cooling Tower Fan

Cool PP Cooling Water Pump

Chill PP Chilled Water Pump

Alarm Alarm

Comp. Compressor

25% Valve 25% Electromagnetic Valve

50% Valve 50% Electromagnetic Valve

75% Valve 75% Electromagnetic Valve

Liquid V. Liquid Electromagnetic Valve

Running Running Indicator

Fig 4.13 Input Page

Legend: Tele Start Remote Start

Tele Stop Remote Stop

Chill WF Chilled Water Flow

Cool WF Cooling Water Flow

High Pre High Pressure Protection

Low Pre Low Pressure Protection

Overload Overload Protection

Motor Internal Protection

LSBLG/MC IOMM

Oil LP Oil Level Protection

Anti-freez Anti-freezing Protection

Oil DP Oil Pressure Difference Protection

Phase Phase Protection

4.6.6 Warning and Protection Page Press WARN button at the running state page to enter the real-time warning page:

Fig 4.14 Warning and Protection Page

This page monitors the warning and protection state (time and name) of chiller system. If

there is a warning, the warning bell will ring. Then you can press MUTE button to shutdown

the ring, but the protection continues. When chiller system comes back from protection state,

you must press RESET button to reset the warning system, and then restart the chiller.

Press MAIN PAGE to close warning page and back to running state page.

4.6.7 Trend Curves Page Press CURT TRND button at the running state page to enter the TEMPERATURE TREND

page as follow:

Fig 4.15 Trend Curve Page

This page displays 4 real-time temperature of the system. The lower number is current value of the check point. The color and the linetype of curves are same as the ones under the relevant text of temperature. Press MAIN to close trend curve page and back to running state page.

LSBLG/MC IOMM

4.6.8 Data Report Page Press DATA REPT button at the running state page to enter the data report page shown as

follow:

Fig 4.16 Data Report Page

History records of 4 temperature data (from the left to the right: inlet chilled water temperature,

outlet chilled water temperature, inlet cooling water temperature, outlet cooling water

temperature) are saved in this page. You can check the history records of the temperatures

by dragging the scroll bar on right side.

Press MAIN to close this page and back to running state page.

LSBLG/MC IOMM

5. Maintenance

5.1 Routine Check

Make a routine record for each unit for recording the running and analyzing any possible problem.

Item Frequency Method Remark

General Items

Noise At any time Listen Stand at 1 m from

the unit to observe Vibration At any time Observe to see whether there is

vibration with high amplitude

Voltage of power

supply At any time Within ±10% of rated voltage

Appearance

Cleaning At any time Keep the unit clean

Rust At any time Do scaling with iron brush and

cover it with antirust paint

Stableness At any time Fasten every screw

Insulating

material flakes

off

At any time Stick them with adhesive

Water leakage Monthly Check whether the drainpipe is

blocked

Compressor

Noise At any time No noise when starting, running or

stopping

Insulation

resistance Yearly

It should be over 5MΩ when

measuring with ohmmeter of

DV500V.

Shockproof

rubber gets

ageing

Yearly It should be elastic when touching.

Middle

inspection

Once per 3000

hours

Pay attention to noise, vibration

and oil level.

Middle

inspection

Once per 6000

hours

Confirm the operation of safety

device and protection device

Condenser

Cooling water

Flow

Temperature

Water quality

At any time

Monthly

Adjust the water flow to keep the

pressure within fiducial value.

Keep it within fiducial value.

See Fig. I

Refer to

relationship chart

between water

quality and scale

Cleanness At any time Keep high pressure within fiducial

value.

Drainage At any time Drain the water before longtime

rest.

Water in pipes

should be also

drained.

Evaporator

Chilled water

Flow

Temperature

Thickness of

antifreeze

Water quality

At any time

Monthly

Monthly

Within fiducial value

Above set thickness

Within fiducial value

See Fig. II

Refer to

characteristic of

antifreeze

Refer to

relationship chart

between water

quality and scale

Cleanness At any time Keep low pressure within fiducial

value. See Fig.Ⅱ

Drainage At any time Drain the water before longtime

rest.

Water in pipes

should be also

LSBLG/MC IOMM

Item Frequency Method Remark

drained.

Thermal

Expansion

Valve

Performance Monthly

The pressure on low-pressure side

does not change when unscrew or

fasten the screw on expansion

valve.

Refer to Fig. I, II

or running pressure

High and Low

Pressure

Switch

Performance Monthly Check according to “performance

of protection device”.

Check whether

every joint is in

good condition.

Pressure

Gauge Performance Yearly Ditto

Operation

Valves Pointer Half-yearly

Compare with the accurate pressure

gauge.

Refrigeration

Cycle Performance Monthly The opening and closing are good.

Electrical

Control

Refrigerant

leakage Monthly

Seek the leakage on the unit and the

pipe joint with leak detector.

Expel the water from condenser and

evaporator and seek leakage on

water inlet and outlet.

Seek-leak can be

done with

electronic detector,

torch detector or

soap water.

Insulation

resistance Monthly

It should be over 1MΩ when

measuring with ohmmeter of

500VDC.

Conductibility of

wire Monthly

Insulating layer should be intact

and well connected. The bolts are

fastened.

Electromagnetic

contactor Monthly

No spark or buzz sound when

pressing ON/OFF of contact

repeatedly.

The interval

should be more

than 3 minutes or

the contact may be

damaged

Rotary switch Monthly Works normally.

Auxiliary relay Monthly Works normally.

Time-limit relay Monthly Works normally.

Table 5.1 Routine Check Table

High pressure: See the following figures for the relation between pressure and outlet cooled water temperature; (The pressure below 12Kg/cm2G or above 18Kg/cm2G is considered abnormal.)

12

2

14

16

18

20

22 24 26 28 30 32 34 36

Outlet cooled water temp.（°C）

Hig

h p

ressure(kg/cm G)

The more the scale on

condenser, the high the

pressure will be.

25

2 20

15

10

20 25 30 35 40

Outlet cooled water temp.（°C）

Hig

h p

ress

ure(kg/cm G)

Saturation curve

This area should be cleaned.

FIG I Full load high pressure

LSBLG/MC IOMM

Low pressure: See the following figures for the relation between pressure and outlet chilled water temperature; (The pressure below 3Kg/cm2G or above 6Kg/cm2G is considered abnormal.)

6

2 5

4

3

5 7 9 11 13 15

Outlet chilled water temp.（°C）（evaporator）

Lo

w p

ress

ure(kg/cm G)

8

2

6

4

25 10 15

Outlet chilled water temp.（°C）（evaporator）

Low

pre

ssure(kg/cm G)

Saturation curve

This area should be cleaned.

FIG II Full load low pressure (standard)

5.2 Charge the Lubricant

The lubricant can be charged with special oil pump or pushed by the atmosphere pressure while vacuum work. It can be charged from the charge port above the oil groove or from the low pressure gas charge port when the unit is running. Use a pump to charge the lubricant into a high pressure system. Be sure there is enough lubricant oil inside the oil tank of the pump before connect the charging hose to the charging port. Drain the air out of the charging hose with the refrigerant, then turn on the pump to start charging. During the charging, the open of the suction pipe cannot be higher than the oil level to avoid the air going inside. After charging, shut off the valve and the oil pump. Clean the pump and store it for next charging work. If charging the lubricant into an empty system, you can vacuum the system firstly and then make the oil pushed into the system by atmosphere pressure. Connect the charging hose to the charging port of the unit, and put the other side of the hose into the lubricant oil. When the pressure difference between the system and the atmosphere is enough, the oil will goes into the system automatically. When charging work completes, shut off the valve of the charging port to avoid the water inside the air to go into the system. Store the lubricant inside the dry and closed container and put it where the sunshine cannot touch. Seal the container to avoid the water inside the air to go into it. The lubricant oil with different model no cannot be stored and used together. Charge the lubricant oil according to the compressor’s rating label. Check the quality of the oil seasonal, drop some oil on the white bibulous paper. If the center of the oil drop is black, it means the lubricant oil cannot be used and should be changed. Superfluous lubricant will reduce the heat exchange efficiency so that the capacity reduces.

5.3 Charge the Refrigerant Gas

The refrigerant can be charged with special charging machine or be directly charged with the gas cylinder. Before the charging work, be sure there is no leakage at the system and the vacuum of it is enough. You can make a mensurable charge work with the charging machine. Connect the charging pipe to the gas charging port of the unit, set the quantity and start the machine. After the charging, seal the port of the unit. If you charge the gas directly with a gas cylinder, you should add a pressure gauge on the pipe between the cylinder and the unit. The cylinder should be put aslant or upside-down for making the liquid refrigerant go into the system rapidly. Watch the pressure gauge, if the

LSBLG/MC IOMM

pressure of the cylinder is same as the system, the charging work cannot go on. Then you can use hot water to shower the cylinder or use a heater to heat the cylinder to increase the pressure inside it. Besides, you can charge the rest of the gas from the low pressure side of the system (behind the expansion valve) while the unit is running. Before charging, push the air inside the connection pipe with a little refrigerant inside the cylinder. If the refrigerant is liquid, you should control the valve to avoid the liquid gas to go inside the compressor which will lead to damage. We suggest charging refrigerant gas while the unit is running for safety.

5.4 Change the Core of the Dry Filter

Close the turnoff valves on both sides of strainer. (If there is only one turnoff valve on one side, refrigerant should be recycled.)

Expel a little refrigerant in drying strainer. Open the cover of drying strainer. Remove the old drying core and fit it with a new one. Install the cover of drying strainer and fasten the bolt. (Please make sure the gasket is

intact.) Vacuum the drying strainer. Open the turnoff valves for starting.

5.5 Maintenance of Bearing of the Compressor

The key of the maintenance of the bearing is the lubricant system. Special lubricant oil should be in use and should maintain a certain oil level and temperature, which should be checked periodically. The abrasion of the bearing can be told by the vibration of the compressor. If there is a heavy vibration of the compressor, please contact Midea Service Department for vibration analysis.

5.6 Check the Rotors of Compressor

The abrasion of the rotors of the compressor can be told by the capacity drop. If the capacity reduces too much, please ask some professionals to check the rotors. This check can be carried out every 5 or 10 years or determined by the real situation.

5.7 Check the Heat Exchange Tubes

The open type water circuit will easily lead to fouling of the heat exchange tubes, which will reduce the heat exchange efficiency so that the capacity of the unit will reduce and the power consumption of the compressor will increase. Soft water is strongly recommended to use in the system. The check and clean the tubes should be carried out every 3 running months. If the water is polluted, it should be more frequently. Use a rotary clean tool to wash the heat exchange tubes because there are screws inside the tubes. According to the check result, you can make sure if the water treatment devices are efficient and determine the period of clean. Always check if there is fouling or rust at the water temperature sensor. NOTE:

Before clean, you should isolated the part you want to cleaned from the system; After clean with the chemical detergent, the tubes should be washed with a lot of water

to dilute the detergent inside the tubes until the PH of the water back to 6-8; Special brush should be used to clean the tubes to avoid to damage the tubes.

LSBLG/MC IOMM

5.8 Electrical Control Cabinet

NOTE: Before maintain the electrical parts, the power supply should be cutoff.

The stuff who maintains the control cabinet should be aware of the circuit diagram and the sunning principle of the unit. The electrical parts need no special maintenance, it is just necessary that checking and tightening the connection wires every month. To ensure the normal running of the unit, the control cabinet should be electrified at least one hour every half year. WARNING：

IF THE WIRING WORK IS NOT CARRIED OUT ACCORDING TO THE INSTRUCTIONS, THE QUALITY GUARANTEE WOULD BE INVALID. IF THE FUSE IS BROKEN OR PROTECTION RELAY IS OFF, IT MEANS THERE IS SHORT-CIRCUIT OR OVERLOAD OF THE SYSTEM. BEFORE CHANGE THE FUSE AND RESTART THE COMPRESSOR, THE FAULTY MUST BE FOUND OUT AND FIXED. THE CONTROL CABINET SHOULD BE REPAIRED BY PROFESSIONALS. IF THERE IS SOME DAMAGE LED BY WIRING CHANGE, MIDEA WILL NOT BE RESPONSE FOR IT.

5.9 Seasonal Maintenance 5.9.1 Stop in Winter

When the ambient temperature reduces to freezing point in winter, the water inside the condenser and evaporator should be all drained out to avoid the damage to the heat exchange tubes led by ice. Be sure the water supply valves would not be open. If the cooling tower is in use and exposed in the ambient as well as the water pump, the water inside the cooling tower and pumps should be drained out. Check if there is rust on the surface of the unit. If there is, the rust must be got rid of and repaint the point. The end cover of the condenser and the evaporator should be open and check and clean the tubes at least once a year.

5.9.2 Start in Summer

Before start a unit stops for a long time, the insulation resistance should be measured with a

500V high-resistant meter, and the value should be higher than 10MΩ. The unit should be

electrified for at least 8 hours to ensure the oil temperature is higher than 23℃.

The control circuit should be electrified unless maintenance. If the oil temperature reduces because of power off, then the oil should be heated for 24 hours before the unit start. Check the electrical components, fix any loose connection.

If the drain plug of cooling pump is got rid of when the unit stop, change a new plug. Install a new fuse inside the breaker if the old one is taken out. Open the water supply valve.

5.10 Anti-freezing Protection in Low Ambient Temperature 5.10.1 Anti-freezing Protection of the Evaporator When the unit stops in winter, the water inside the unit should be all drained out. Wash the evaporator with ethylene glycol to avoid freezing. All chilled water pipes should be heat-insulated well. Before this work, please contact local dealer of Midea for correct instructions.

LSBLG/MC IOMM

5.10.2 Anti-freezing Protection of the Condenser If the cooling water is lake water or the water valve is exposed in the outdoor cold air, the temperature inside the condenser is possible lower than the indoor temperature. All the cooling water should be drained out and the water system should be washed with ethylene glycol to avoid freezing.

5.11 Common Faulty Diagnosis The control system of LSBLG/MC screw chiller has many functions about faulty diagnosis. All the running parameter can be checked with the human-machine interface. If there is a faulty, the control system will give out a warning and it will be recorded in the history warning page for checking.

5.11.1 Reset of Warning

When the faulty is repaired, the unit cannot start until the reset button is pressed. There are 2 modes (auto and manual) of reset. Even the unit is running, the reset can be operated.

5.11.2 Troubleshooting Table 5.2 Troubleshooting

Symptom Cause Treatment

1. Compressor cannot

work

No power;

Switch works (over current);

Starting switch failure;

The fuse is melted;

Interlocking device does not work;

High/low pressure switch work

Switch on the power after checking;

Find out the cause. Replace the switch or adjust

the voltage.

Examine and replace it

Replace it

Check if the fan of cooling tower and all the

water pump work, if not, make them run.

Adjust the pressure.

2.The unit stops

immediately after

starting

High/low pressure switches work Insufficient cooled water in condenser. Add

water into it.

Expel the incondensable air from condenser.

Clean the expansion pipe or replace it if it is

damaged.

Clean the cooled water strainer.

3. Discharge pressure

is too low

Insufficient refrigerant;

High degree of superheat of

expansion valve;

Excessive cooled water or the water

temp. is too low;

Drying strainer is blocked.

Check the leakage and add the refrigerant into

the unit.

Adjust it.

Adjust the water volume.

Replace and clean the filter.

4. Over high discharge

pressure

Excessive refrigerant;

Incondensable air inside;

Bad effect of cooling tower;

Water pump is damaged;

Pipes of condenser are dirty;

High-pressure gauge can not indicate

precise figure;

Insufficient cooled water;

Expel some refrigerant.

Expel the air.

Check it and do reparation.

Repair it.

Do cleaning.

Replace a new gauge.

Replenish the water.

LSBLG/MC IOMM

Symptom Cause Treatment

Strainer of cooled water is blocked. Do cleaning.

5.Suction pressure is

too high

Chilling overload;

Low degree of superheat of

expansion valve;

Excessive refrigerant.

Adjust the load.

Adjust it.

Expel some refrigerant.

6.Suction pressure is

too low

Insufficient refrigerant;

Blocked by desiccant;

Chilling load is too low;

Insufficient chilled water;

Strainer of chilled water is blocked.

Check the leakage and add the refrigerant into

the unit.

Replace and clean the filter.

Adjust the load.

Replenish the water.

Do cleaning.

7. Capacity adjusting

device failure

Thermostat failure;

Solenoid valve is damaged;

Capillary tube is blocked.

Replace it with a new one.

Replace it with a new one.

Do cleaning.

8. Compressor

overheat

Defective bearing of compressor;

Over high pressure on liquid side;

Temp. and pressure of refrigerant on

gas side is too high;

Electromotor is overheated.

Replace the compressor.

Refer to item 4.

Adjust the pressure on gas side and the

unfolding degree of solenoid valve.

Refer to item 10.

9. NFB jumps

Short circuit of wiring.

Wiring is grounded.

Electromotor of compressor failure.

Measure the insulation resistance.

Ditto.

Measure the grounding insulation resistance and

phase insulation resistance.

10. Over loading relay

of compressor

electromotor works

NFB jumps, unit runs with single

phase power;

Voltage too high or too low,

unbalanced voltage;

Defective solenoid switch cause the

unit run with single phase power;

Defective electromotor;

Temp. inside distribution box is too

high;

Over high running pressure;

Compressor starts frequently;

Insufficient chilled engine oil in

compressor.

Check it.

Check the distribution box.

Repair or replace it.

Repair or replace it; if it is burnt, clean the

refrigerant pipelines.

Keep the temp. below 40℃.

Refer to item 4 and 5.

Check all the automatic devices.

Clean the oil filter.

5.13 Clean Procedure 5.13.1 Relation between water quality, scale and degree of corrosivity:

Water Quality Scale Corrosivity Remark

1 PH≤6 Acid water Hard Strong Generates insoluble CaSO4

2 PH≥8 Alkali water Soft ——

Soft fluid deposit may be

caused by ions iron or

aluminum

3 Water with much Ca2+

and Mg2+

Hard —— Easily generates hard scale.

4 Water with much Cl- Dirt Ultra-strong Corrosive to copper and iron.

5 Water with much SO42-

and SiO22-

Hard Strong Generates hard CaSO4 and

CaSiO2

6 Water with much Fe3+

Large quantity,

hard Strong

Generates deposits Fe(OH)3

and Fe2O3

7 Odorous water Large quantity Ultra-strong Generates sulfide, ammonia

LSBLG/MC IOMM

and marsh gas, especially H2S

which has great corrosivity to

copper.

8 Water with organic substance Large quantity —— Easily generates scale

9

Exhaust gas from auto, chemical

factory, plating factory, sewage

plant, ammonia refrigeration plant

and fiber factory

Strong

Copper tubes of condenser may

be eroded and perforated.

10 Dusty places such as plastic plant Large quantity

11 Sulfurous gas in the air Ultra-strong

12

Natural pollution such as damp air

near the coast or insects in the

field goes into cooling tower.

Large quantity Strong

Table 5.3 Relation between water quality, scale and degree of corrosivity

Cycle under normal temperature (A): (Capacity of condenser+ Capacity of pipe+ Capacity of container) ×1/3(Thickness of detergent 33%)

Cycle under normal temperature (B): (Capacity of flume of cooling tower+ Capacity of

condenser+ Capacity of pipe)×1/10(Thickness of detergent 10%)

In case doing cleaning after the unit stops, the capacity of flume of cooling tower can be 1/2 or 1/3 of rated value; if doing cleaning as the unit is running, the capacity should achieve rated value.

Precautions on usage of detergent When doing cleaning, please wear rubber gloves and do not expose your

skin or your clothes to the detergent. In case touching the detergent, please wash it with clean water.

The container for detergent should be made of plastic or glass rather than lead.

The used detergent should be neutralized with lime or soda before draining into drain channel.

Detergent is harmful to human; please keep it away from children. Turn on the unit after cleaning to ensure it is clean. If necessary, please do

cleaning again.

5.13.2 Wash the Shell and Tube Heat Exchanger Stop the unit and the cycling water pump, shut the connection between the unit and the water system and form a water circuit with a anti-acid water pump showed as Fig 5.1;

Tank Waste Tank

Connection Pipe

Washing Fluid

PumpChilled Water

Inlet

Chilled Water

Outlet

She

ll an

d T

ube

Hea

t Exc

hang

er

Connection Pipe

Fig 5.1 Connection Diagram of Cleaning of the Water System

LSBLG/MC IOMM

Fill clean water inside the tank and start the pump. Check if there is a leakage or strange noise in the system and make the clean room ventilated well. Do some protection for the equipments surrounded to avoid the clean detergent to damage them. Drain all the water out of the A/C system and fill it with clean water as well as the detergent. Start the anti-acid pump for a period which is determined according to the detergent and the fouling to make the water cycled to clean the system. Stop the pump and drain out the polluted water to the waste tank. Then fill clean water into the tank and start the pump to wash the system with clean water. Measure the PH value of the water with PH test paper. Add some neutralizer step by step until the PH value is 7, and then keep the pump working for a while for completing the neutralization reaction. Use clean water to wash the system again after drain the polluted water out until there is no water with fouling going out. Add some neutralizer into the waste water tank and contact some special company to treat the waste water. Connect the unit into the system again and make sure the unit can work normally.

Note for the detergent: Wear a pair of rubber gloves when making the wash work. DO NOT make the detergent touch the cloths, face or body. If so, please wash it with clean water immediately. The container for detergent should be rubber or glass bottle, never use plumbous can. The used detergent should be neutralized with calcareousness or soda, and then contact special waste-treatment company to treat it. The detergent will do harm to human body, never put it where children can touch. Confirm the washing effect before start the unit again. If this effect is not so good, the exchangers have to be washed again.

LSBLG/MC IOMM

6. Appendix

6.1 Outline Dimension Diagrams

Single Compressor Serried Unit

chilled water outlet chilled water inlet

cooling

water outlet

AB

C

D

E

KJ

H

GF 50

cooling

water inlet

foundation bolt

4-M20×220

Mode

LSBLG A B C D E F H J K

Cooling

water

Inlet/outlet

Chilled

water

Inlet/outlet

115/MC 2940 800 1740 1400 520 2140 810 187 200 DN80 DN80

170/MC 2940 800 1770 1600 520 2200 830 210 225 DN100 DN100

275/MC 2970 850 1880 1600 570 2180 900 203 225 DN100 DN100

Single Compressor Paratactic Unit

chilled water outlet chilled water inlet

coolingwater outlet

water inletcooling

foundation bolt

4-M20×220

C A

K

D

J

B

E

H

GF

Mode

LSBLG A B C D E F H J K

Cooling

water

Inlet/outlet

Chilled

water

Inlet/outlet

350/MC 2995 1350 1480 1600 1250 2180 450 240 200 DN125 DN125

420/MC 3600 1380 1540 1800 1250 2180 450 215 250 DN125 DN125

560/MC 3600 1390 1660 1800 1250 2790 468 235 250 DN125 DN125

650/MC 3600 1450 1720 1800 1350 2680 545 255 285 DN150 DN150

LSBLG/MC IOMM

Dual-compressor Paratactic Unit

chilledchilled water

coolingwater outlet

coolingwater inlet

foundation bolt

4-M20×220

C A

KD

E

B

J

FG

H

inletwater outlet

Mode

LSBLG A B C D E F H J K

Cooling

water

Inlet/outlet

Chilled

water

Inlet/outlet

700/MC 3800 1570 1720 1800 1440 2680 540 248 285 DN150 DN150

840/MC 4400 1500 1690 2000 1440 3100 550 258 284 DN150 DN150

975/MC 4400 1540 1740 2000 1440 3130 575 265 250 DN150 DN150

1120/MC 4800 1670 1740 2000 1540 3080 615 294 240 DN150 DN150

1300/MC 4800 1740 1865 2000 1640 3080 640 315 340 DN200 DN200

LSBLG/MC IOMM

6.2 Refrigeration Circuit Diagram

Single-compressor Unit

Condenser

Compressor

Evaporator

Dry-filter

Cooling Water Out

Cooling Water In

Chilled Water Out

Chilled Water In

Thermoswitch

Low-pressure GaugeHigh-pressure Gauge

Pressure Controller

Dual-compressor Unit

Condenser

Compressor

Evaporator

Dry-filter

Cooling Water Out

Cooling Water In

Chilled Water In

Low-pressure GaugeHigh-pressure Gauge

Pressure ControllerCompressor

Dry-filter

Chilled Water In

Low-pressure GaugeHigh-pressure Gauge

Pressure Controller

Condenser

LSBLG/MC IOMM

6.3 Electrical Circuit Diagram

Diagram 1 for single-compressor, 4-step control unit

Fan Motor

Current

Switch

Voltage

Switch

Inside the

wiring box of

motor

Internal

Protection

Switch

Discharge-Temp

Protection Switch

LSBLG/MC IOMM

Diagram 2 for single-compressor, 4-step control unit

LSBLG/MC IOMM

Diagram 3 for single-compressor, 4-step control unit

LSBLG/MC IOMM

Diagram 1 for single-compressor, continuous control unit

Current

Switch

Voltage

Switch

Inside the

wiring box of

motor

Internal

Protection

Switch

Discharge-Temp

Protection Switch

Loading electromagnetic valve

Start electromagnetic valve

Unloading electromagnetic valve

Liquid electromagnetic valve

LSBLG/MC IOMM

Diagram 2 for single-compressor, continuous control unit

LSBLG/MC IOMM

Diagram 3 for single-compressor, continuous control unit

LSBLG/MC IOMM

Diagram 1 for dual-compressor, 4-step control unit

LSBLG/MC IOMM

Diagram 2 for dual-compressor, 4-step control unit

LSBLG/MC IOMM

Diagram 3 for dual-compressor, 4-step control unit

LSBLG/MC IOMM

Diagram 4 for dual-compressor, 4-step control unit

LSBLG/MC IOMM

Diagram 1 for dual-compressor, continuous control unit

LSBLG/MC IOMM

Diagram 2 for dual-compressor, continuous control unit

LSBLG/MC IOMM

Diagram 3 for dual-compressor, continuous control unit

LSBLG/MC IOMM

Diagram 4 for dual-compressor, continuous control unit

LSBLG/MC IOMM

6.7 Pressure Enthalpy Chart of R134a