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Emerson Copeland Scroll ZR K3 Series, Application Engineering Bulletin

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Emerson Copeland Scroll ZR K3 Series Application Engineering Bulletin Download Page 18

AE4-1312 R2

© 2010 Emerson Climate Technologies

Printed in the U.S.A.

18

Table 7

Approved Start Components for Scroll Compressors

Model

MFD

Volts

Part 

Number

G.E. p/n

Emerson p/n Pick-up 

Volts

Drop-out 

Volts

Coil 

Voltage

ZR16K(x) to 

ZR48K(x)-PFV  88-108 

330  014-0036-03  3ARR3CT3P5  040-0001-79  170-180 

40-90 

332

ZR46K(x) to 

ZR68K(x)-PFV  270-324  330  014-0006-10  3ARR3CT3P5  040-0001-79  170-180 

40-90 

332

x = C, 3, 4 or CE, 3E, 4E (ZR_KA Start components still in development)

Summary of Contents for Copeland Scroll ZR K3 Series

Page 1: ... the high side and the low side of the compressor It is designed to open when the discharge to suction differential pressure exceeds 375 to 450 psid 26 32 kg cm2 When the valve opens hot discharge gas is routed back into the area of the motor protector to cause a trip During developmental blocked fan testing it is sometimes noted that the valve opens but the compressor does not shut off while the ...

Page 2: ...e shutdown sound for acceptability in a particular system Also refer to section on Brief Power Interruption Discharge Check Valve Alow mass disc type check valve in the discharge fitting of the compressor prevents the high side high pressure discharge gas from flowing rapidly back through the compressor This check valve was not designed to be used with recycling pump down because it is not entirel...

Page 3: ...ng the off cycle See Figure 2 and Table 6 Pump down Cycle A pump down cycle for control of refrigerant migration is not recommended for scroll compressors of this size If a pump down cycle is used a separate external check valve must be added The scroll discharge check valve is designed to stop extended reverse rotation and prevent high pressure gas from leaking rapidly into the low side after shu...

Page 4: ... muffler should be located a minimum of six inches 15 cm to a maximum of 18 inches 46 cm from the compressor for most effective operation The further the muffler is placed from the compressor within these ranges the more effective it may be If adequate attenuation is not achieved use a muffler with a larger cross sectional area to inlet area ratio The ratio should be a minimum of 20 to 1 with a 30...

Page 5: ...ls and permanent damage to the scroll tips drive bearings and internal seal See AE24 1105 for proper system evacuation procedures Nomenclature The model numbers of the Copeland Scroll compressors include the approximate nominal 60 HZ capacity at standard operating conditions An example would be the ZR24K3 TFD which has 24 500 Btu hr 7 kw cooling capacity at the ARI high temperature air conditionin...

Page 6: ...s ready for assembly to the unit It is suggested that the larger suction plug be removed first to relieve the internal pressure Removing the smaller discharge plug could result in a spray of oil out of this fitting since some oil would accumulate in the head of the compressor after Emerson test runs the compressor The inside of both fittings should we wiped with a lint free wipe to remove residual...

Page 7: ... could ignite when it escapes and contacts the brazing flame It is important to check both the high pressure and low pressure side with manifold gauges before unbrazing Instructions should be provided in appropriate product literature and assembly line repair areas If compressor removal is required the compressor should be cut out of system rather than unbrazed See Figure 6 for proper compressor r...

Page 8: ...e filter drier recommendations It is highly recommended that the suction accumulator be replaced if the system contains one This is because the accumulator oil return orifice or screen may be plugged with debris or may become plugged shortly after a compressor failure This will result in starvation of oil to the replacement compressor and a second failure Start up of a New or Replacement Compresso...

Page 9: ...igerant flood back To test for repeated excessive liquid flood back during normal system off cycles perform the Field Application Test Obtain a sample compressor with a side sight tube to measure liquid level in the compressor Set the system up in a configuration with the indoor unit elevated several feet above the outdoor unit with twenty five feet 8 meters of connecting tubing with no traps betw...

Page 10: ... heat pump heating mode For other applications such as AC only review expansion device to raise superheat A cold sump may result in high refrigerant migration after shut down Liquid Level Drainage In Off Cycle Scroll Accumulator Figure 2 To prevent flooded start damage on 3 phase scrolls due to off cycle migration the accumulator may be configured on some systems to allow free drainage from the co...

Page 11: ...ications Timer Opens 1 Electrical cycle Timer Closes Greater than 5 seconds later 016 sec with 60 HZ operation power is restored or not after power is removed Typical Solid State Timer if used Fuse Discharge Line Thermostat if used Compressor Contactor Condenser Fan Contactor if used Other Protective Devices if used System Operating Thermostat 230 240 VAC C1 C ...

Page 12: ...ections Figure 4 Terminal Fusite Connection 70 80 90 100 110 120 130 140 150 160 170 20 10 0 10 20 30 40 50 60 Condensing Temp C Evaporating Temp C Condensing Temp F Evaporating Temp F R22 Scroll Operating Envelope 20 15 10 5 0 5 10 25 15 70 60 50 40 30 ZR__KA Limited Envelope All Other Scroll Products Figure 5 ...

Page 13: ... braze temperature is attained moving torch up and down and rotating around tube as necessary to heat tube evenly Add braze material to the joint while moving torch around joint to flow braze material around cir cumference After braze material flows around joint move torch to heat Area 3 This will draw the braze material down into the joint The time spent heating Area 3 should be minimal As with a...

Page 14: ...AE4 1312 R2 2010 Emerson Climate Technologies Printed in the U S A 14 Operating Principle of Scroll Figure 7 ...

Page 15: ...uired Not Required Required Required Not Required Required Required Required Other 1 Nominal System Charage 2 Table 1 Scroll Compressor Application Diagram 1 Other includes bleed type TXVs capillary tubes and fixed orifices 2 Nominal System Charge is defined as the design charge for a system Note See text for crankcase heater requirements 120 Times Compressor refrigerant charge limit in Table 5 ...

Page 16: ...onent Description Tubing Configuration Shock loop Service Valve Straight through valve not fastened to unit Suction muffler May be required Acts as dampening mass Table 3 K1 K2 K3 K4 KC ZR18 25µf 370 volt 30µf 370 volt 35µf 370 volt 30µf 370 volt ZR23 30µf 370 volt 40µf 370 volt 35µf 370 volt 35µf 370 volt ZR26 35µf 370 volt 40µf 370 volt 30µf 440 volt ZR28 35µf 370 volt 45µf 370 volt 35µf 440 vol...

Page 17: ...KC 4 ZR16KA ZR34KA 53 018 0052 00 240 40 02 6319 00 21 53 018 0052 01 120 40 02 6319 02 21 ZR18K3 ZR48K3 ZR26KC ZR48KC ZR38KA ZR54KA 63 018 0041 00 240 40 02 6307 00 21 63 018 0041 01 120 40 02 6307 02 21 63 018 0041 02 480 40 02 6307 03 21 63 018 0041 03 575 40 02 6307 06 21 63 018 0041 04 240 40 02 6311 00 48 63 018 0041 05 480 40 02 6311 03 48 63 018 0041 06 240 40 02 6313 00 32 ZR54K3 ZR61K3 Z...

Page 18: ...Model MFD Volts Part Number G E p n Emerson p n Pick up Volts Drop out Volts Coil Voltage ZR16K x to ZR48K x PFV 88 108 330 014 0036 03 3ARR3CT3P5 040 0001 79 170 180 40 90 332 ZR46K x to ZR68K x PFV 270 324 330 014 0006 10 3ARR3CT3P5 040 0001 79 170 180 40 90 332 x C 3 4 or CE 3E 4E ZR_KA Start components still in development ...

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