Gas Fired Double-Effect Chiller-Heater

12
Gas Fired Double-Effect Chiller-Heater CH-MG Series: 150 and 200 RT Cooling Capacities W E A R E F R I E N D L Y T O T H E E A R T H

Transcript of Gas Fired Double-Effect Chiller-Heater

Page 1: Gas Fired Double-Effect Chiller-Heater

Gas Fired Double-Effect Chiller-HeaterCH-MG Series: 150 and 200 RT Cooling Capacities

W E A R E F R I E N D L Y T O T H E E A R T H

Page 2: Gas Fired Double-Effect Chiller-Heater

Yazaki MG-Series gas fired DOUBLE-EFFECT chiller-heaters, with cooling capacities of 150 and 200 tons of refrigeration, are designed for commercial applications where chilled water and hot water are used in a central air conditioning system. The condenser is water cooled and heat is rejected through a cooling tower.

The Yazaki absorption chiller-heater uses a solution of lithium bromide and water, under a vacuum, as the working fluid. Water is the refrigerant and lithium bromide, a nontoxic salt, is the absorbent. The double-effect absorption cycle has two generators - one directly heated by a gas burner and the other heated by hot refrigerant vapor. Refrigerant, liberated by heat from the solution, produces a refrigerating effect in the evaporator when cooling water is circulated through the condenser and absorber.

Gas FiredDOUBLE-EFFECTChiller-Heater

Absorption Principle

Cooling Cycle

High-Temperature GeneratorThe gas burner heats dilute lithium bromide solution in the high-temperature generator and, as the solution boils vigorously under a vacuum, droplets of concentrated solution are carried with refrigerant vapor to the separator. After separation, hot refrigerant vapor flows to the low-temperature generator and concentrated solution is precooled in the heat exchanger before flowing to the absorber.

Low-Temperature GeneratorHot refrigerant vapor from the separator heats dilute lithium bromide solution in the low-temperature generator. Refrigerant vapor, liberated from this solution, flows to the condenser while solution, which is now concentrated, is precooled in the heat exchanger before flowing to the absorber.

CondenserIn the condenser, refrigerant vapor is condensed on the surface of the coil and latent heat, removed by the cooling water, is rejected to a cooling tower. Refrigerant liquid accumulates in the condenser and then passes through an orifice into the evaporator.

HEAT EXCHANGER

SOLUTION PUMP

CHANGEOVER VALVE(Solution)

CH-MG (COOLING)

Gas Supply

HIGH TEMPGENERATOR

LOW TEMPGENERATOR

SEPARATOR

CHANGEOVER VALVE(Refrigerant)

ABSORBER

EVAPORATOR

CONDENSER

ORIFICE

Refrigerant Vapor

Chilled Water

Cooling Water

BURNER

EVAPORATOR

ORIFICE

Chilled Water

ConcentratedSolution

DiluteSolution

RefrigerantLiquid

RefrigerantVapor

ChilledWater

Cooling Water

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Page 3: Gas Fired Double-Effect Chiller-Heater

EvaporatorIn the evaporator, refrigerant liquid is exposed to a substantially deeper vacuum than in the condenser due to the influence of the absorber. As refrigerant liquid flows over the surface of the evaporator coil it boils and removes heat, equivalent to the latent heat of the refrigerant, from the chilled water circuit. The recirculating chilled water is cooled to 44.6˚F and the refrigerant vapor is attracted to the absorber.

AbsorberA deep vacuum in the absorber is maintained by the affinity of the concentrated solution from the generator with the refrigerant vapor formed in the evaporator. Refrigerant vapor is absorbed by concentrated lithium bromide solution flowing across the surface of the absorber coil. Heat of condensation and dilution are removed by the cooling water and rejected to a cooling tower. The resulting dilute solution is preheated in the heat exchanger before returning to the generator where the cycle is repeated.

Heating Cycle

High-Temperature GeneratorDilute lithium bromide solution is heated in the high-temperature generator by the gas burner in the same manner as the cooling cycle. The solution boils vigorously and droplets of concentrated solution are carried with refrigerant vapor to the separator. Hot refrigerant vapor flows through the refrigerant changeover valve into the evaporator and concentrated solution flows through the solution changeover valve into the absorber sump.

EvaporatorHot refrigerant vapor condenses on the surface of the evaporator coil and heat, equivalent to the latent heat of the refrigerant, is transferred to the hot water circuit. The recirculating water is heated to 140˚F.

AbsorberRefrigerant liquid mixes with concentrated lithium bromide solution and the resulting dilute solution returns to the generator where the cycle is repeated.

HEAT EXCHANGER

SOLUTION PUMP

CHANGEOVER VALVE(Solution)

CH-MG (HEATING)

Gas Supply

HIGH TEMPGENERATOR

LOW TEMPGENERATOR

SEPARATOR

CHANGEOVER VALVE(Refrigerant)

ABSORBER

CONDENSER

ORIFICE

Hot Water

BURNER

RefrigerantLiquid

EVAPORATOR

ORIFICE

Hot Water

EVAPORATOR

ConcentratedSolution

DiluteSolution

HotWater

RefrigerantVapor

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Page 4: Gas Fired Double-Effect Chiller-Heater

Features & Benefits n Each Chiller-Heater Serves a Dual Purpose: Cooling and Heating This compact chiller-heater reduces floor space and installation costs because it replaces the traditional chiller-boiler combination and simplifies piping, pumps, valves and controls.

n High Cooling COP of 1.2 Reduces fuel consumption and operating costs by up to 17% compared with other double-effect absorption units.

n Part Load IPLV Rating >1.3 Reduces seasonal fuel consumption because the chiller operates more efficiently at part load for most of the time.

n Low NOx Gas Burner <30 ppm Advanced Riello low NOx gas burners are used to meet the strict air quality requirements of California and other states.

n Hermetic Integrity Strict quality control and testing with a mass spectrometer ensures the vacuum section is airtight and eliminates the need for an onboard mechanical purge pump. Hydrogen, a by-product of the absorption cycle, is continuously removed through a palladium cell or stored with other noncondensible gases in an external purge tank

n PID Microprocessor PID (proportional, integral and differential) controls are utilized to optimize the absorption cycle performance and provide stable chilled water and hot water outlet temperatures under all load conditions.

n Burner Firing is Modulated 30% to 100% The burner is proportionally controlled to match the output capacity of the chiller- heater and reduce operating costs.

n Safe, Odorless, Non-toxic Working Fluids Ozone safe and CFC free. Working fluids of non-toxic lithium bromide and water operate safely under a vacuum at all times.

n A Single VFD Hermetic Solution Pump One variable speed pump circulates solution and reduces electrical consumption at part load. Additional pumps are not required because gravity feed drippers are used to distribute refrigerant and solution instead of spray nozzles. This eliminates the need for periodic nozzle maintenance.

n Low Cooling Water Temperature Cooling operation allowed down to 65˚F inlet cooling water without the need for cooling tower bypass control.

n Weatherproof Cabinet Equipment room is not required because the chiller-heater is enclosed in a weatherproof cabinet suitable for indoor or outdoor installation.

n Low Electrical Consumption Since less than 19.3 VA/RT is required to operate the chiller-heater, it is not neccessary to upgrade the existing electrical service.

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Features & Benefits(Continued)

n Built-In Shutdown Controls Safely shuts down the chiller-heater under abnormal operating conditions.

n Ideal for a Two Pipe Hydronic System Installation costs reduced because only two pipes are required to transport chilled or hot water to a central air handling unit or multiple fan-coil units.

n 30 Minute Changeover Cooling/heating changeover only requires a 30 minute delay.

n Simple Mode Selection Cooling or heating operation can be selected at the chiller-heater or remotely from the building management system.

n Built-In Digital Display Panel Used for mode selection, operating status and troubleshooting.

n Remote Chilled Water and Hot Water Reset Raise chilled water setpoint or lower hot water setpoint to reduce operating costs during unoccupied hours.

n Hinged Marine Water Boxes Allow easy access to the condenser and absorber for tube cleaning and maintenance without disconnecting piping.

n Factory Installed Crossover Pipe and Insulation Eliminates site fabrication and installation of crossover pipe between the absorber and condenser and site insulation of cold and hot surfaces. n Simplified Transportation and Lifting Each modular chiller-heater is mounted on a steel frame and anchor points are provided for lifting.

n Quiet Operation Since the chiller-heater has relatively few moving parts, the noise level is typically less than 74idB(A) and there is no vibration. The chiller-heater is ideal for installation adjacent to occupied spaces because it does not compromise occupant comfort.

n Simple Maintenance Only two routine service calls are required per year to evacuate noncondensible gases and check other operating conditions. Start-up, routine maintenance and troubleshooting are provided by a network of independent Yazaki authorized service providers with backup from the factory.

n Factory Charged and Performance Tested Since each chiller-heater is shipped completely assembled and tested, installation and start-up are simplified.

n ISO9001 and ISO14001 Factory Certification Quality control is assured by compliance with strict manufacturing and industry standards.

n UL Listed for USA and Canada

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Control Characteristics

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Minimum Setpoint

Maximum Setpoint

Minimum Setpoint

105039.2

41.0

42.8

44.6

46.4

48.2

50.0

51.8

53.6

55.4

15 20 25

Time (min)

Standard Rating Point

Digital PID Control

COOLINGSETPOINT

Chi

lled

Wat

er O

utle

t Tem

p. (

˚F)

Minimum Setpoint

Maximum Setpoint Maximum Setpoint

1050

131.0

132.8

134.6

102.2

104.0

105.8

136.4

138.2

140.0

141.8

143.6

145.4

147.5

15 20 25

Time (min)

HEATINGSETPOINT

Hot

Wat

er O

utle

t Tem

p. (

˚F)

Minimum Setpoint

Maximum Setpoint

2010035.6

39.2

42.8

46.4

50.0

53.6

57.2

30 40 50 60

Time (min)

Chilled Water Inlet Temp.

Chilled Water Outlet Temp.

Proportional ControlDigital PID Control

PID COOLING CONTROL

Chi

lled

Wat

erTe

mp.

(˚F

)

8070

123.8

127.4

131.0

134.6

138.2

141.8

143.6

40 50 60

Time (min)

Hot Water Outlet Temp.

Hot Water Inlet Temp.

Hot

Wat

erTe

mp.

(˚F

)

8070Proportional ControlDigital PID Control

80%Load

50% Load 80%Load

20100 30

PID HEATING CONTROL

80%Load

50% Load 80%Load

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Standard Specification

Application (Gas Fired Cooling & Heating System – Cooling Operation)

DiluteSolution

RefrigerantLiquid

RefrigerantVapor

ChilledWater

Cooling Water

ConcentratedSolution

GAS FIRED DOUBLE-EFFECT CHILLER-HEATER

FAN COIL UNIT

COOLAIR

COOLING TOWERGasSupply

* Minimum cooling water flow

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NOTES:1. Fuel input is based on H I G H E R H E AT I N G VALUE of gas.2. Specifications are based on water in all circuits and foul ing fac tor of 0.0005 ft2hr.˚F/Btu.3. Do not exceed 114 psi operating pressure in any water circuit.4. Chilled/hot water flow limits are 80~120% of standard rating.5. Cooling water flow limits are 100~120% of standard rating. 6. Two or more modules m a y b e i n s t a l l e d i n p a r a l l e l f o r l a r g e r capacities.7. S t anda rd na tu r a l ga s supply pressure is 7.0 in. wc.8. Sound pressure noise level measured in a free field at a point 39 in. in front of the chiller-heater and 59 in. above the ground.

MODEL CH-MG150 CH-MG200

Capacity (Btu/hr x 1000)Chilled Water Temp. (°F)Capacity (Btu/hr x 1000) Hot Water Temp. (°F)

Heat Rejection (Btu/hr x 1000)Cooling Water Temp. (˚F)*Rated Water Flow (gpm)Cond./Abs. Press. Loss (psi) Water Retention Volume (gal) TypeInput (Btu/hr x 1000)Power SupplyConsumption (kVA)Cooling and HeatingTypeFlame DetectionIgnitionSound Pressure dB(A)

1,800 2,400

1,245 1,660

3,045 4,060

658.6 878.1

114 153

CoolingHeating

1,500 2,0001,500 2,000

CoolingHeating

2.9 3.32.9 3.3

74 74Chilled/Hot Water (in)Cooling Water (in)Gas Supply (in)Exhaust Vent (in)

4 Flange 5 Flange5 Flange 6 Flange2 NPT 2 NPT

12,346 14,330Dry (lb) Operating (lb) 13,698 16,183

Cooling

Heating

Cooling Water

Fuel

Electrical

Control

Combustion

Piping

Noise Level

Weight

13.8 x 9.8 (inside)

30% - 100% PID ControlLow NOx Forced Draft Burner

UV ScannerIntermittent Spark

208V or 230V, 60Hz, 3ph

Natural Gas

7.5

85.1 Inlet, 94.3 Outlet

140.0 Outlet, 132.8 Inlet

44.6 Outlet, 53.6 Inlet

Rated Water Flow (gpm)Evap. Press. Loss (psi)Water Retention Volume (gal)

399.4 532.6

48 69

Chilled/HotWater 10.5 9.2

7.2

TypeMaterialFinish

Weatherproof

Silver metallicCabinet Pre-painted hot dipped galvanized steel

Page 8: Gas Fired Double-Effect Chiller-Heater

NOTES:1. Capacities are based on standard gas input ratings.2. Standard water flow rates used in all circuits.3. Fouling factor of 0.0005 ft2hr.˚F/Btu in the condenser/absorber and evaporator.4. Performance data may be interpolated but must not be extrapolated.5. Expanded performance data is provided for reference only. Contact Yazaki Energy Systems, Inc. for certified data or p e r f o r m a n c e a t o t h e r conditions.

Expanded Cooling Performance

Normally, for comfort cooling applications the chiller-heat-er will operate at part load cooling for most of the time. Since less heat is rejected through the cooling tower during part load cooling operation, the lower cooling water temperature improves the cooling performance by increasing the Coefficient ofPerformance (COP) and reducing the gas input. The chiller-heater can operate with 65˚F minimum cooling water inlet temperature without the need for cooling tower bypass control.

Part Load Cooling Performance

2020

30

40

50

60

70

80

90

100

30 40 50 60

Cooling Capacity (%)

Cooling Water Inlet Temps. A, B, Cat ARI 560-200 Conditions44.6˚F Chilled Water Outlet

CH-MG SERIES

Fue

l Inp

ut (

%)

70 80 90 100

44.6˚F Chilled Water Outlet

ARI 560-2000 Part LoadCooling Water Inlet TemperaturesA (85.0˚F), B (77.5˚F), C (70.0˚F)

C

B

A

TEMPERATURE (˚F) COOLING CAPACITY & HEAT REJECTION (Btu/hr x 1000)

CH-MG150Cooling Capacity

Cooling Capacity

Heat Rejection

Heat Rejection

ChilledWaterOutlet

CoolingWaterInlet

CH-MG200

41.042.844.646.448.241.042.844.646.448.241.042.844.646.448.2

1,5821,7431,8311,8621,8771,4771,6791,8001,8301,8531,3051,5841,7501,7961,836

2,8272,9883,0763,1073,1222,7222,9243,0453,0753,0982,5502,8292,9953,0413,081

2,1102.3242,4422,4832,5031,9692,2382,4002,4402,4701,7402,1122,3342,3952,448

3,7703,9844,1024,1434,1633,6293,8984,0604,1004,1303,4003,7723,9944,0554,108

80

85.1

90

NOTE: Data highlighted is based on standard rated conditions.

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NOTES:1. Fuel Input (%) is gas consumption as percentage of full load rated fuel input.2. Cooling Capacity (%) is percentage of full load rated cooling capacity.3. Broken line indicates part load characteristics at full load rated COP.

Page 9: Gas Fired Double-Effect Chiller-Heater

COOLINGWATER

TEMP (˚F)

COOLINGCAPACITY

(%)

POINT

100755025

ABCD

85.077.570.070.0

C

B

A

20

1.20

1.22

1.24

1.26

1.28

1.30

1.32

1.34

30 40 50 60

Cooling Capacity (%)

CO

P

70 80 90 100

70.0˚F Cooling Water Inlet

77.5˚F Cooling Water Inlet

85.0˚F Cooling Water Inlet

2083.0

84.0

85.0

86.0

30 40 50 60

Fuel Input (%)

Heating OperationCH-MG SERIES

The

rmal

Effi

cien

cy (

%)

70 80 90 100

ARI 560-2000 Integrated Part Load Value (IPLV) is a single number measure of part load cooling performance based on a w e i g h t e d a v e r a g e o f c o m m o n b u i l d i n g t y p e s , operating hours and average U.S.A. weather data.

Part load performance is often expressed as Coefficient of Performance (COP):

IPLV =0.01A+0.42B+0.45C+0.12D

Where A, B, C and D are part load COP’s at the following conditions:

Part Load IPLV Rating

COP = Net Output Net Input

Since the minimum gas input to the chiller-heater is 30%, the corresponding cooling capacity at 70.0˚F cooling water inlet is 33.6%. The equivalent COP at 25% cooling capacity (Point D) is calculated from this conditionto account for cycling.

During part load operation, the heating efficiency of the chiller-heater increases. As the firing rate is reduced, the burner modulates both fuel and air; and the ratio of heat exchanger surface area to fuel input increases.

Part Load Heating Performance

COOLINGWATER

TEMP (˚F)

ARIWEIGHTED

FACTOR

COP WEIGHTEDAVERAGE

COP

COOLINGCAPACITY

(%)

POINT

100755025

ABCD

85.077.570.070.0

1.2001.2831.346*1.300

0.010.420.450.12

0.0120.5390.6060.1561.313IPLV* Calculated as per ARI 560-2000

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NOTE:Fuel Input (%) is gas consumption as percentage of full load rated fuel input.

Page 10: Gas Fired Double-Effect Chiller-Heater

STANDARD JUNCTION BOX (JB) CONNECTIONS

Typical Piping

Typical Field Wiring

OPTIONAL CONTROL BOX (CB) CONNECTIONS

• Power supply.• Chilled/hot water and cooling water pump control.• Thermal overload interlocks from chilled/hot water pump, cooling water pump and cooling tower fan.

• Cooling water flow switch (FS2) input (Flow switch supplied by others).• Freeze protection switch (IF1) input for chilled/hot water (Temp. switch supplied by others).• Freeze protection switch (IF2) input for cooling water (Temp. switch supplied by others).• Exhaust fan control output.• Exhaust fan interlock.• Cooling tower sump level switch (LS).

• Cooling/heating mode status.• Chiller-heater operating status.• Chiller-heater standby status.• Dilution cycle status.• Burner operating status.• General shutdown alarm output.• External fault alarm output.• Main fault alarm output.• Burner flame failure alarm.• External fault interlock (Additional control supplied by others).• Earthquake switch shutdown.• Remote temperature control 4.5˚F setup/setback.

P P T

T

T

T

F

T P T P

M

P P

COOLING TOWERCWV

CHILLER-HEATER

CHILLED/HOT WATER PUMP

COOLING WATER PUMP

Supply Return

IF1(Optional)

IF2 (Optional)

Drain

Water Supply

CTS

CWTS

GasInlet

FlushValve

Drain

LS (Optional)LS (Optional)

Water Supply

P FT

SYMBOL DESCRIPTIONSYMBOL DESCRIPTIONSYMBOL DESCRIPTIONSYMBOL DESCRIPTIONSYMBOL DESCRIPTION

Temp. gauge

Expansion joint

Pressure gauge

Strainer

Gas meter

Relief valve

Reducing valve

Expansion tank

Check valve

Manual valveAIR

HANDLINGUNIT

FAN COILUNIT

FAN COILUNIT

Drain

Drain

Air VentFlushValve

Drain

Chilled/Hot Water Outlet

Chilled/Hot Water Intlet

Cooling Water Inlet

Cooling Water Outlet

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OPTIONAL JUNCTION BOX (JB) CONNECTIONS• Remote cooling/heating mode selection.• Remote start/stop selection.• Cooling tower fan control output (Alternative to CTS).

COOLING WATERPUMP

COOLING TOWER

SYMBOL DESCRIPTION SYMBOL DESCRIPTION

IF1

IF2

CWTS

Chilled/hot water freeze switch CTS Cooling tower switch

Cooling water temperature switch CWV Cooling water control valve

Cooling water freeze switch LS Level switch

CWV

CHILLER-HEATER

IF1 (Optional)

IF2 (Optional)

CTS

CWTS

Power Supply(208V or 230V, 60Hz, 3ph)

POWERBOX

(Suppliedby

Others)

FUSED DISCONNECTS

LS (Optional)LS (Optional)

WIRING (Number of Conductors)

M

CHILLED/HOTWATERPUMP OPTIONAL

JUNCTION BOXCONNECTIONS

OPTIONALCONTROL BOXCONNECTIONS

CB

JB

Page 11: Gas Fired Double-Effect Chiller-Heater

Dimensions (CH-MG Series)

All dimensions in inches

12.9

14.313.87.7

62.262.276.8 8.78.3

8.7 88

.2 (

H)

20.6

2.02.0

87.6

45.4 16.3

17.7144.2 (L) 2.3

3.5

73.3

(W

)

75.6

34.7 13

.0

50.6

11.8

13.8

37.7

17.4

Cooling wateroutlet 5 flange

Chilled/hot wateroutlet 4 flange

Chilled/hot waterinlet 4 flange

REAR VIEW

EXHAUST VENT FLANGE DETAILS

Connect Class B venting system to exhaustvent flange for indoor installations

Cooling waterinlet 5 flange

Gas inlet 2 flange

Condensatedrain 1/2 tube

TOP VIEW

RIGHT SIDE VIEW

Vent CapExhaust vent flange

Field wiringjunction box

CH-MG150

NOTES:1. All pipe connections are ANSI Class 150 flanges.2. indicates anchor bolt location.3. Ensure that minimum clearance space is provided for chiller-heater maintenance (length 40 in., above 40 in. and sides 28 in.).4. Provide maintence clearance for tube removal in front (preferred) or rear of chiller-heater.

FRONT VIEW

56.0

SIDE

Front

Rear

Left

Right

CLEARANCE (IN)

115 (Note 4)

40

28

28

15.7 10 holes10 mm dia.

62.262.280.7 8.78.3

8.7 97

.6 (

H)

20.5

2.02.0

89.6

39.1 16.3

15.7

17.7147.0 (L) 2.3

3.5

77.2

(W

)

58.5 11

.8

13.8

7.7

25.6

13.0

13.018.0

3.328.1

55.9

37.8

85.3

TOP VIEW

RIGHT SIDE VIEWFRONT VIEW REAR VIEW

EXHAST VENT FLANGE DETAILS

Vent CapExhaust vent flange

Field wiringjunction box Connect Class B venting system to exhaust

vent flange for indoor installations

Cooling waterinlet 6 flange Cooling water

outlet 6 flange

Chilled/hot waterinlet 5 flange

Gas inlet 2 flange

Condensatedrain 1/2 tube

NOTES:1. All pipe connections are ANSI Class 150 flanges.2. indicates anchor bolt location.3. Ensure that minimum clearance space is provided for chiller-heater maintenance (length 40 in., above 40 in. and sides 28 in.).4. Provide maintence clearance for tube removal in front (preferred) or rear of chiller-heater.

CH-MG200

Chilled/hot wateroutlet 5 flange

SIDE

Front

Rear

Left

Right

CLEARANCE (IN)

115 (Note 4)

40

28

28

10 holes10 mm dia.

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Page 12: Gas Fired Double-Effect Chiller-Heater

YAZAKI SALES REPRESENTATIVE/DISTRIBUTOR

For information concerning sales, operation, applicationor technical assistance, please contact your

Yazaki Sales Representative/Distributor or the following:

YAZAKI ENERGY SYSTEMS, INC.701 E. PLANO PARKWAY, SUITE 305,

PLANO, TEXAS 75074Phone: 469-229-5443

Fax: 469-229-5448Email: [email protected]

Web: www.yazakienergy.com

Yazaki reserves the right to discontinue, or change at any time,

specifications or designs without notice and without incurring obligations.SB-MGUL-1107