Emerson AE4-1395 manual Yes

Page 17

Application Engineering

 

 

 

 

B U L L E

T

I

N

AE4-1395

Start

 

 

 

 

 

 

Is the compressor

 

Is the compressor

 

 

WARNING!

 

 

 

Allow time to cool

Disconnect and lockout

 

running?

No

overheated?

Yes

 

 

the power before

 

 

 

 

 

 

proceeding

 

Yes

 

No

 

 

 

 

Observe the compressor

 

Perform troubleshooting

 

 

 

 

 

to determine why the

 

Put the system back into

Remove one wire from

 

suction & discharge

 

 

 

 

compressor isn’t

 

operation and retest

the modulation coil

 

pressures

 

 

 

 

running

 

 

 

 

 

 

 

 

 

 

Are pressures

 

 

 

 

 

 

changing with the

 

Operation

 

 

Measure the resistance

 

modulation

Yes

is normal

 

 

of the coil

 

cycle?

 

 

 

 

 

 

No

 

 

 

 

 

 

Measure the voltage at

 

 

 

 

Coil has continuity

 

the modulation coil

 

 

 

 

 

 

 

 

 

and isn’t grounded?

No

terminals

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Yes

 

Is voltage present,

 

 

 

 

Replace modulation

 

 

Troubleshoot the

 

 

valve, follow valve

 

coinciding with the

 

 

 

 

No

modulation control

 

 

replacement

 

modulation cycle?

 

 

 

 

 

 

 

instructions

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

Figure 10

Modulation Troubleshooting

Replace modulation

coil

Put the system back into

operation and retest

© 2012 Emerson Climate Technologies, Inc.

17

Printed in the U.S.A.

 

Image 17
Contents Assembly Line Procedures SafetyService Procedures IntroductionSafety Icon Explanation Safety InstructionsElectrical Shock Hazard Safety StatementsPressurized System Hazard Burn HazardNomenclature Digital Compressor Operation 410A 22 & R-407CHow it Works Application ConsiderationsSolenoid Valve and Coil Sound CharacteristicsPressure Fluctuations PipingPower Factor Scroll Temperature ProtectionCrankcase Heaters Oil Type and Oil RemovalApplication Tests Modulation ControlOil Level Verification Digital Compressor Retrofit ApplicationsPerformance Modeling Retrofit Applications To AvoidSystem Modifications Compressor Selection & Change-OutAssembly Line Procedures Modulation Troubleshooting Service ProceduresTo 7.5 Ton Modulation Valve Replacement Procedure To 15 Ton Modulation Valve Replacement ProcedureForm No Copeland Scroll Compressor Functional Check50% Loaded 80% Loaded To 15 Ton Digital Scroll Cross Sectional View ZPD34-54K5 22, R-407C, R-410A Operating EnvelopeCompressor Capacity Graph Discharge Thermistors Second Operating Cycle AE4-1395To 7.5 Ton Tandem Yes Foot-Pounds Inch-Pounds Refrigerant Charge Limits Model PoundsPart TBD