Mega Chill (2 comp) - Manual...

COMPRES

SOR2 ON

MED. L

IQUID LEVEL

0

29.5

CR

R

A. S. CONTROLSPVT. LTD.

Navi Mumbai, India 91-22-27782005 91-22-27782002 Tel: Fax: email: [email protected] www.ascontrols.comweb:

CONTENTS

1. Accessaries in Box 3

2. Introduction

2.1 Main Features 4

2.2 Hardware Description 4

3. Hardware 5

3.1 Mega Chill User Interface 5

3.2 Input/Output Board 7

3.3 Sensors 8

3.4 Prokey 8

3.5 Transformer 8

3.6 Dimensions 9

3.7 Connections 10

4. Operations 12

4.1 Description - Inputs / Outputs 12

4.2 Mega Chill Keypad 13

4.3 How to Turn On/Off the Chiller 15

4.4 Water Pump 16

4.5 Water Temperature 16

4.6 Set-Point and Differential 16

4.7 Antifreeze 16

4.8 PUMP-DOWN 17

4.9 Water Level 17

5. Programming 18

5.1 Programming Levels 18

5.2 USER Parameters 18

5.3 FACTORY Parameters 19

5.4 Parameter Description & Values 21

6. Alarms 25

7. Technical Specifications 26

8. Precautions & Care 27

1

2 COMPRESSOR2 COMPRESSOR

NO.

1.

2.

3.

4.

QTY

1No.

1No.

4Nos.

1No.

ITEMS

TOROIDAL TRANSFORMER WITH SCREW(I/P: 0-230V, O/P1: 0-9V @0.35A, O/P2: 0-10V @0.5A)

CATALOG

PROKEY

SCREWS (4X12)

5. 2Nos.NTC SENSORS (1.5m)

6. 1No.COMMUNICATION CORD(2m)

LIQUID LEVEL SENSORS (2m) OR LIQUID LEVEL SWITCH

2 3

1. Accessaries in Box

Items Included

Specifications are subject to change due to continuous improvements of our products. No consequential damage or field labour is included in the sales of products mentioned in this manual. The manufacturer is not liable for incorrect use/misuse of the product mentioned.

A.S. Controls Pvt Ltd. All rights reserved Sub-Zero and the Sub-Zero logo are registered trademarks of A.S. Controls Pvt Ltd.

NO.

1.

QTY

3Nos.

ITEMS

Optional Items

NTC SENSORS (1.5m)2. 4Nos.


54

2. INTRODUCTION

The “MEGA CHILL-2COMP” is a two compressor chiller controller . This integrates all the required functions of the chiller.

It is very user friendly due to the LCD provided which gives all the parameters, messages, alarms etc on the display. In addition to the LCD there are LED's provided for instant status on all controls in the system.

2.1 Main FeaturesThe Mega Chill controller allows you to manage refrigeration units having different configurations.

WATER condensation.

AIR condensation.

System’s Functions:

The system controls and regulates the following conditions :

Water temperature according to the user’s location of the sensor.Protection of the compressor with indication of any possible fault.Display of Chiller status on

temperature on LCD and

LED display.Regulates level of water via

a water solenoid valve.2.2 Hardware Description

The basic system comprises of Mega Chill User interface Input / Output board

Mega chill is the intelligent part of the system. It also represents the ‘user interface’ for an easy communication between user and the controller.

3.1 Mega Chill User Interface

Mega Chill User Interface is a user friendly board which integrates all controller keys, display LCD and display LEDs.

3. Hardware

COMPRESSOR2 ONMED. LIQUID LEVEL


29.5


29.5

6 7

Liquid Crystal Display (LCD)

The LCD screen shows description of the controller parameters, and any other information concerning the controlled variables.

Display 2 rows X 16 characters.Character Size 5.56 X 2.96 mm.

Liquid Crystal Display (LCD)

Light Emitting Diodes (LED)

There are 23 LED indications on the chiller front panel indicating :

Phases - all 3 phases are displayed as RYB.

Faults - Red blinking LED ALERT Indicates that there is a fault.

Individual device fault - Red LED indicates that there is a fault in that particular device.

Device OK status - Green LED indicates that the device is OK.

Device is inactive - Blank LED indicates that the device is inactive.

COMPRESSOR 2 ONMED. LIQUID LEVEL

Light Emitting Diodes (LED)

3.2 Input/Output Board

The Relay board represents the core of the system, where the signals coming from the probes, digital inputs etc. are processed.

On this board you can locate :

1. Terminals for power source-

10Vac (yellow) & 9 Vac (red).

2. Liquid level sensor inputs

(Level Sensors).

3. Analog inputs (sensors).

4. Digital Inputs (alarms).

5. Digital outputs (relay).

6. Telephone connector for user

interface connection.

Input/ Output


8 9

3.3 Sensors

Japanese NTC thermistors, housed in a water proof I.P. 68 metal casing.

(Custom made sensors are available in various sizes and material)

3.4 ProkeyThis hardware key enables the manufacturer to enter programming Level 2(Factory Level Programming).

Prokey(Only for equipment manufacturer)

3.5 TransformerSystem uses a highly reliable Toroidal transformer as it’s power supply source.

Transformer

Standard Sensor ½”BSP SensorSS 316L Sensor

3.6 Dimensions

Input / Output Board

Mega Chill User Interface

Panel cutout 124 mm X 167 mm (All dimensions in mm)

167

45

124

160

205

178

163

119

134


243mm

13

0m

m

15

0m

m

75mm

50

mm

10m

m

10mm

85mm

50m

m

223mm

To Display

10 11

3.7 Connections

8 way LAN cable

Chiller Interface Terminal for panel mounting

Input/Output Board


ALL F

US

E =

1.5

Am

p

FUSE

FUSE

C

NO

FUSE

NC

PUMP

COND.1

COMP.2

COND.2

C

NO

COMP.1

C

NO

C

NO

C

NO

C

NO

FUSE

FUSE

WATER SV

FUSE

To Display

AC

1

AC

2

TRANSFORMER~ ~

9V

10V

PU

MP

D

OW

N S

V2

PU

MP

DO

WN

SV

1

FU

SE

FU

SE

AL

AR

M

C NO

C NO

C NO

FU

SE

HIGHMEDLOW

LIQLEVEL

SENSOR

ANTI FREEZE

WATER IN

COND OUT

COND IN

CONTROL

WATER OUT

TR

IP S

IGN

AL

B PHASE

Y PHASE

R PHASE

HP1LP1

COMP1 O/LOSS1

HP2LP2

COMP2 O/LOSS2

COND1 O/LCOND2 O/L

EWFSSPP

NEUTRAL

PUMP O/L

SE

NS

OR


29.5

LIQLEVEL

SWITCH

OR

MEDLOWREF.

12 13

4.1 Description- Input /Outputs

Analog Inputs (Probe)The system has the following analog (probe) inputs.

1. CONTROL - Used as the main controlling probe based on which the set point will

regulate the system.2. COND IN - Indicates

Condenser Inlet temperature.3. COND OUT - Indicates

Condenser Outlettemperature.

4. WATER IN - Senses Water (Chiller) Inlet temperature.

5. WATER OUT - Senses Water (Chiller) Outlet temperature.

6. ANTI FREEZE : Used as an Internal Anti Freeze control.

Digital Outputs (Relay)System will operate the following devices 1. Chiller Pump2. Compressor13. Condenser Fan14. Liquid SV1 for Pump Down15. Compressor26. Condenser Fan27. Liquid SV2 for Pump Down28. Water SV9. Alarm

Mega chill manages the following protections

Digital Inputs (Trip Signals)1. HP1 - High Pressure for Comp12. LP1 - Low Pressure for Comp13. Compressor Overload14. OSS1 - Oil Safety Switch15. COND. Fan O/L1 -

Condenser Fan Overload16. HP2 - High Pressure for Comp2 7. LP2 - Low Pressure for Comp2 8. Compressor Overload2 9. OSS2 - Oil Safety Switch for

Comp2 10.COND. Fan O/L2 -

Condenser Fan Overload211.EWFS (water cooled)-

Evaporator Water FlowSwitch.

12.Pump Overload13.Single Phase Preventor 14.Antifreeze Trip (Internal)15.R - R Phase (Input)16.Y - Y Phase (Input)17.B - B Phase (Input)

Controller informs the user of a fault condition via a Buzzer and an ALARM RELAY.

WARNING :All HP, LP, OSS and Antifreeze are by default in manual reset mode. In case of any fault the user can reset them bypressing the CLEAR key for 4 sec. These can be changed to auto reset by changing P4 parameter.

4. Operations

00.04

MUTECLEAR

4.2 Mega Chill Keypad

1 2

34

56

7

COMPRESSOR2 O

NMED. LI

QUID

LEVEL


29.5

14 15

TEMP

4. MUTEPress this key for 1 second, to disable the buzzer and alarm relay.

5. TEMPPress and hold this key for 1 seconds to display temperatures for all probes. Use up/down key to scroll through the various probes attached. To exit this mode, press the temp key.

6. PUMP DOWNPressing PUMP DOWN for 4 seconds forces a manual pump Down cycle (If pump down parameter H1 is active).

7. PRG, SEL, UP & DOWNUsed to enter and navigate in programming mode.

1. STARTPress and hold this key for 4 seconds to bring the controller in an operative status from the stand-by status, in which it normally is after being powered on except if H2 parameter is set to AUTOSTART mode.

2. STOPPress and hold this key for 4 seconds to stop the system and operate in Stand By mode.

3. CLEARPress and hold this key for 4 seconds to reset HP, LP and antifreeze alarms which have been set for MANUAL RESET incase P4 parameter is set to MANUALRESET mode.

START

00.04

STOP

00.04

MUTE

00.0 I

CLEAR

00.04

Press and hold the ‘START’ key for 4 sec. the unit will change from standby to working status. Unit can only be switched on when there are no errors.

The first device to start is the Water Pump. Then, as required, Mega Chill will switch on the compressor and other devices depending on the setting.

Pump trippump ol

0=auto start offi=auto start on

4.3 How to Turn ON/OFF the Chiller

WARNING:The pump functioning has total priority. If the pump stops due to any alarm condition, the controller will be placed in a standby position.

The unit also turns off and moves to a standby position when there is an error status.

NOTE:It is also possible to enable the auto start function by selecting ‘1’ in H2 parameter. Once selected, the machine will automatically restart after a power off condition.

START

00.04

STOP

00.04

Press and hold the ‘STOP’key for 4 sec. to switch the controller into standby position.


PUMPDOWN

16 17

4.4 Water PumpPUMP is the first device to be activated after the chiller has started. Pump functioning has absolute priority amongst all other devices.The pump’s status is always ON even if the set temperature has been achieved.

ALARMSThe alarms that can block the pump are:

WATER FLOW SWITCH(This alarm is ignored for a selected time as per parameter P1 & P2)PUMP OVERLOADLOW LIQUID LEVEL

4.6 Set-Point and Differential Set point is the temperature at which the chiller has to be regulated. At this temperature the compressor will switch off. Differential is the temperature added to the set point after which the compressor restarts. For

0example, If the Setpoint is 7 C, 0and the differential is 2 C, the

0compressor will switch off at 7 C 0 0 0 0and restart at 9 C (7 C+2 C=9 C).

4.7 AntifreezeThe ant i f reeze procedure activates when the AFT probe temperature reaches or goes below the selected threshold in parameter A1, The compressors are immediately stopped, without pump-down procedure and the liquid line solenoid valve is de-energised. The antifreeze alarm is displayed on the LCD.

The system will not allow a restart until AFT temperature reaches or goes above A1 + A2.

To disable the ANTIFREEZE based on the internal AFT probe, change A0 parameter to 0.

4.5 Water temperatureR e g u l a t i o n o f t h e w a t e r temperature is based on the CONTROL PROBE. This control probe can be installed by the user at the inlet or outlet of the evaporator, or any other location, where he wants to regulate the water / media.

4.8 PUMP-DOWNThe PUMP-DOWN procedure can be enabled through H1 parameter.

PUMP-DOWN STAGE :A. De-energisation of the Liquid Solenoid Valve.B. T h e c o m p r e s s o r k e e p s operating until the LOW pressure cutout input intervenes.C. When the system cuts off on the input from the low pressure cutout, the compressor turns OFF and the PUMP-DOWN procedure is over.

If the compressor remains on for more than 50 seconds without cutting off on the low pressure switch, Megachill will force a compressor shut down and indicate a FAULTY PUMP-DOWN procedure provided the CUT IN temp has not been achieved. In this case check the LIQUID SOLENOID VALVE and LOW PRESSURE CONTROL. If within 50 seconds, the CUT IN temp has been achieved, the system will activate the solenoid and continue operating normally without pump down.

PUMP-DOWN CYCLEA pump-down cycle is used to pump all refrigerant into a receiver or condensor during the OFF cycle. The purpose is to prevent refrigerant from migrating to the crankcase, where it can condense and saturate the oil. Without a pump-down cycle, the crankcase can fill liquid refrigerant during a long off-cycle. At start up, the liquid refrigerant can flood the cylinders and damage the compressor much l i k e a f l o o d b a c k . ( L a r g e compressors have springs on intake) After the system has cooled the evaporator sufficiently, a solenoid valve closes in the liquid line and the compressor pumps refrigerant into the condenser or receiver, where it remains until the next on-cycle.

4.9 Water LevelSystem controls the level of water in the evaporator tank via three water level sensors, High, Med & Low. As soon as the level of water goes below the Medium level, the controller will activate a Water Solenoid Valve. In case the level goes below the Low level sensor, the system trips and displays a Low Liquid Level Fault.

WARNING If the machine controlled by mega chill is not using the water level sensing feature, it is necessary to short all water inputs concerning the water level. This will disable the liquid level errors.


WATERMEDIUM

WATERLOW

WATERSV

18 19

5.1 Programming LevelsThere are two programming levels allowing authorized personnel to enter and change parameters

LEVEL 1 - USERCan be directly accessed by the user for the selection of

Main Probe calibration.AFT Probe calibration.Set Point for Comp1.Set Point for Comp2.Differential1.Differential2.System Auto start.Keypad Lock.

5.2 USER PARAMETERS1) If you press and hold SEL for 4

seconds, the display shows the code of the first parameter.

2) Using the UP and DOWN keys allows scrolling all user

parameters.

3) Press SEL again to display the required user parameter and modify it’s value with the UP and DOWN key.

LEVEL 2- MANUFACTURERCan only be accessed by the chi l ler manufacturer via a PROKEY for.

Setting of all parameters.

Program modemain probe cal


5. PROGRAMMING

00.04

00.04

4) Press PRG to store the modified parameters and return to the user parameters menu.

5) To end programming and exit user mode, press SEL key when LED display shows EP.

If you do not press any key within 60 seconds after having entered this procedure, the unit will return to normal operation without storing the values of the modified parameters.

5.3 PARAMETERSThese ‘working’ parameter are protected with a hardware key (Prokey) to prevent any unauthorized access to the data.


Program modetime delay

00.05

1) Press PRG + SEL for more than 5 seconds to enter the FACTORY parameters. Prior toentering this mode, the Prokeymust be inserted in a socketbehind the user Interface, as illustrated above.

2) Press SEL for 2 seconds to view Set Point and t1, t2 of Compressor 1 and Compressor 2, Keypad lock.

Prokey


20 21

3) Using the UP and DOWN keys allows scrolling all factory parameters.

4) Press SEL display the required factory parameter.

5) Modify it’s value with the UP and DOWN key.

6) Press PRG to store the modified values and exit the procedure, while SEL allows you to return to the FACTORY parameters menu.

7) To end programming and exit FACTORY mode, press SEL key when LED display shows EP (End Programming).

If you do not press any key within 60 seconds after having entered this procedure, the unit will return to normal operation without storing the values of the modified parameters.

Program modetime delay

Program modeend of program

5.4 Parameter Description & Values

Para : Parameter M.U.: Measuring Unit MAX : Maximum settable LimitSet By : U = User, F = Factory min : time in minutes MIN : Minimum settable LimitFac. : Factory set values Sec : time in seconds Var : Variation

0C : Temperature in degree centigrade Flag : Operating status/condition.

Set Para Description MIN MAX Fac. M.U. Var.

by

0T1 “MAIN PROBE CAL” U -10.0 10.0 0.0 C 0.5Control Probe CalibrationIt may so happen that during the course of time there may be a slight offset in the actualtemperature and the temperature shown. For e.g.if the actual temperature is

020 C and the temperature on 0the controller shows 22 C,set

0this parameter to -2 C and once out of this mode, the temperature will display

0 0 020 C (22 C-2 C).

0T2 “AFT PROBE CAL” U -10.0 10.0 0.0 C 0.5AFT Probe CalibrationSetting as T1

0R1 “SET TEMPERATURE1” U R6+0.5 R5-0.5 10.0 C 0.5Set Point for compressor1

0R2 “SET TEMPERATURE2” U R6+0.5 R5-0.5 7.0 C 0.5Set Point for compressor2

0R3 “DIFFERENTIAL1” U 1.0 10.0 2.0 C 0.5Differential for Compressor1

0R4 “DIFFERENTIAL2” U 1.0 10.0 2.0 C 0.5Differential for Compressor2

0R5 “MAX SET TEMP” F Higher 50.0 50.0 C 0.5Maximum Cooling Set Point SPOnce set at a particular value, this will not allow theset point to go above thisvalue and below R4 setting.Eg: Setting this parameter at

O25 C will not allow the set Opoint to go above 25 C. Also

if the temperature reaches O25 C the display will show

Ht (High Temp) indicating that the temperature has gone above the value in this parameter and at this point the alarm will come on.


22 23

0R6 “MIN SET TEMP” F A1+1 Lower 5.0 C 0.5Minimum Cooling Set-Point SPUse UP/DOWN keys to get desired value & press set key to confirm. Once set at a particular value, this willnot allow the set point to go below this value and above R5 setting.Eg : Setting this parameter at

O-30 C will not allow the set Opoint to go below -30 C. Also

if the temperature reaches O-30 C the display will show

Lt (Low Temp) indicating thatthe temperature has gone below the value in this parameter and at this point the alarm will come on.

C1 “COMP1 TIME DELAY” F 0 20 3 Min 1Time Delay for Compressor1restartE.g. If this parameter is set at 3min, then after cutting off the compressor1 at set temperature compressor1 will not restart for a minimum of 3min.This time delay is also active at power on of the system.

C2 “COMP2 TIME DELAY” F 0 20 3 Min 1Time Delay for Compressor2restartE.g. If this parameter is set at 3min, then after cutting off the compressor2 at set temperature compressor2 willnot restart for a minimum of 3min.This time delay is also active at power on of the system.

C3 “COMP START DELAY” F 0 120 10 Sec 1Time Delay between twoCompressor startE.g. If this parameter is set to 30sec, then second compressor will come on after 30sec delay from first compressor switch on.


bySet

Para Description MIN MAX Fac. M.U. Var.by


F1 “FAN START LOGIC” F 0 1 0 Flag 1Fan Start Logic0 = Fan always On.1 = On when compressor

is ON.

F2 “FAN START TIME” F 0 10 10 Sec. 1Starting Time of FansFans will start these manyseconds before the compressor starts.

A0 “AFT PROBE ACTIVE” F 0 1 0 Flag 1To activate Antifreeze(AFT)Probe Function0 = Disable AFT probe.1 = Enable AFT probe.

0A1 “AFT SET TEMP.” F -30 R6-1 4 C 1Antifreeze Set Point forAFT Probe

0A2 “AFT DIFFERENTIAL” F 1 10 2 C 1Differential for AFT Probe

P1 “WFS STARTUP DELAY” F 0 120 5 Sec 1Flow switch alarm delayed at power on System will activate the alarmonly if the error persists for more than the P1 secs at system startup.

P2 “WFS NORMAL DELAY” F 0 90 5 Sec 1Flow switch alarm delayed during normal operation If this parameter is set at 10 seconds, the system will activate the flow switch alarm only if the error persists for or more than 10 seconds. In this manner a false alarm can be avoided during normal operation.

P3 “LP START DELAY” F 0 120 40 Sec 1Low Pressure Alarmdelayed during compressor start upIf this parameter is set at 30seconds, the system will activate the low pressure switch alarm only if the error persists for or more than 30 seconds. In this manner a

24 25


bySet

Para Description MIN MAX Fac. M.U. Var.by


H1 “ACTIVE PUMP DOWN” F 0 1 0 Flag 0 To activate Pumpdown

Procedure This parameter is used to activate or deactivate pump down procedure at every refrigeration cycle. 0 = Inactive. 1 = Active.

H2 “SYSTEM AUTOSTART” F 0 1 0 Flag 1Autostart on power on

0 = Controller Standby on power on.1 = Controller Autostart on

power on.

H3 “PHASE ERRORS” F 0 1 1 Flag 1R Y B Phase Error0= Inactive.1= Active.Incase of 0 system will ignore R Y B errors.

H4 “UNIT1 SELECTION” F 0 1 1 Flag 1

0= Unit1 Off.1= Unit1 On.Incase of 0 system will not activate UNIT1 and all its faults.

H5 “UNIT2 SELECTION” F 0 1 1 Flag 1

0= Unit2 Off.1= Unit2 On.Incase of 0 system will not activate UNIT2 and all its faults.

H6 “PUMP START LOGIC” F 0 1 0 Flag 1PUMP with CompIt defines Pump working logic.0= Pump Always On.1= Pump On/Off with Comp.

false alarm can be avoided due to low pressure at Compressor start up.

P4 “ALARM RESET” F 0 1 0 Flag 1Reset of Alarms0= Manual Reset for allHP, LP, OSS and AFT alarms1= Auto Reset for HP, LP OSS and AFT alarms.

H7 “FAULT IN STANDBY” F 0 1 0 Flag 1

It Enable/Disable fault sensing in standby mode.0 = Disable.1 = Enable.

FO “FAULT SENSE LOGIC” Fault sense logic of F 0 1 0 Flag 1digital inputs0 = Faults at 0V.1 = Faults at 230V.

LP “KEYPAD LOCK” U 0 1 0 Flag 1

0 = Keypad Active.1 = Keypad Locked.

FS “FACTORY SET” F 0 1 0 Flag 1Factory Set Parameters1 = Restore factory set

parameters.

EP “END OF PROGRAM” F FlagEnd programming modeOnce in this mode press the SET key. The controller goes into the normal mode and all settings are saved.

26 27

Controller should be installed in a place protected by vibration, water and corrosive gases and where ambient temperature does not exceed the values specified in the technical data.

Probe : To give correct reading, the probe must be installed in a place protected from thermal influences, which may affect the temperature to be controlled.

8. PRECAUTIONS & CARE

WARNING:Improper wiring may cause irreparable damage and personal injury. Kindly ensure that wiring is done by qualified personnel only.

CAUTION WIRING : The p robe and i t s corresponding wires should never be installed in a conduit next to control or power supply lines. The electrical wiring should be done as shown in the diagram. The power supply circuit should be connected to a protection switch. The

2terminals admit wires of upto 2.5 mm .

Maintenance Cleaning : Clean the surface of the controller with a soft moist cloth. Do not use abrasive detergents, petrol, alcohol or solvents.

Notice : The information in this document is subject to change in order to improve reliability,

design or function without prior notice and does not represent a commitment on the part of

the company. In no event will the company be liable for direct, indirect, special, incidental or

consequential damage arising out of the use or inability to use the product or

documentation, even if advised of the possibility of such damages. No part of this manual

may be reproduced or transmitted in any form or by any means without the prior written

permission of the company.

Disclaimer : This manual & its contents remain the sole property of A.S.Controls Pvt.Ltd.,

India and shall not be reproduced or distributed without authorization. Although great care

has been taken in the preparations of this document, the company or its vendors in no event

will be liable for direct, indirect, special, incidental or consequential damage arising out of

the use or inability to use the product or documentation, even if advised of the possibility of

such damages. No part of this manual may be reproduced or transmitted in any form or by

any means without the prior written permission of the company. A.S.Controls Pvt.Ltd.

reserves the right to make and changes or improvements without prior notice.

Warranty : This product is warranted against defects in materials and workmanship for a

period of one year from the date of purchase. During the warranty period, product

determined by us to be defective in form or function will be repaired or, at our option,

replaced at no charge. This warranty does not apply if the product has been damaged by

accident, abuse, and misuse or as a result of service or modification other than by the

company. This warranty is in lieu of any other warranty expressed or implied. In no event

shall the company be held liable for incidental or consequential damages, such as lost

revenue or lost business opportunity arising from the purchase of this product.

1. Analog Inputsa) Sensor type : Japanese NTC thermistors.

0b) Specification : 10K @ 25 C0c) Resolution : 0.5 C0d) Accuracy : +/- 1 C

Controlling Temp. Range0 0a) -30 C to + 50 C

2) Digital Inputs(Potential Contacts)a) Max continuous input

voltage : 230 Vacb) Input current (closed

contract): 10 mA

3) Digital Output (Relay)a) Type : SPDTb) Contacts : C & NO

(C,No, NC for compressor)c) Rating : 250 Vac, 5A(resi)

All digital outputs are fused

4) Operating Temperature (User Interface & Relay Board)

0 0A) -50 C to +50 C (Non-condensing)

5) Storage Temperature(User interface & Relay Board)

0 0a) -20 C to + 70 C(non-condensing)

6) Operating HumidityMax 80% (non-condensing)

7) Storage HumidityMax 80% (non-condensing)

8) Mounting a) User interface :

Panel mounting b) Relay Board :

Panel mounting

9) I.P. Standardsa) Probe - IP68b) Mega Chill User Interface - If buzzer hole is sealed, rating is IP65 for front. Silicon sealant should be applied along the perimeter of the panel cut out before the unit is fitted to obtain IP65 grade.c) I/O Board - Not Applicable

10) Min. Cable Section(Screw terminal relay board)

20.5 mm

11) Max. Cable Section (Screw terminal relay board)

22.5 mm

12) Fuse 1.5A

13) Transformer Torroidal typePrimary Input : 230Vac, 50HzOutput :Secondary 1: 9Vac, 350mASecondary 2: 10Vac, 500mA

7.TECHNICAL SPECIFICATIONS


04 / 04.07.13

Mega Chill (2 comp) - Manual...

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