REPLACING THE

COMPRESSOR

CONTACTOR

IMPORTANT: Always refer to the wiring dia- grams that came with your chiller to locate spe- cific electrical compo- nents. Illustrations in the User Guide are intended to be representative only.

WARNING: Electrical Shock Hazard

Only qualified service personnel who have been trained on electrical testing and the procedures for avoiding the hazards should diagnose or correct prob- lems that require opening the unit with power on.

The compressor may be located in the compressor electrical enclosure or in the main chiller electrical enclosure, depend- ing on the model of your chiller.

The compressor contactor should be replaced if:

You have checked the amp draw on each of the three-phase legs and discovered a voltage imbalance greater than 10%.

You have checked the continuity and found that ohms at the coil equal zero.

To replace the compressor contactor:

1

Disconnect and lockout the main power.

 

 

2

Open the electrical enclosure. Turn the screw on

 

the front panel counterclockwise to open.

 

 

3

Disconnect the wires from the compressor con-

 

tactor contactor. Label the wires to ensure you can

 

connect them correctly to the new contactor.

 

 

4

Remove and discard the old contactor.

 

Reverse this procedure to install the new con-

5

 

tactor. Make sure the wires are connected correctly.

6-16

TROUBLESHOOTING

microKool Portable Chillers

UGH004/0999

Page 72
Image 72
Conair MPA, MPW manual Replacing Compressor Contactor, Remove and discard the old contactor