Service Manual

Table Of Contents

A. Refrigeration Circuit Service Information

WARNING

• Repairs requiring the refrigeration circuit to be opened must be performed by

properly trained and EPA-certied service personnel.

• Use an electronic leak detector or soap bubbles to check for leaks. Add a trace

of refrigerant to the system (if using an electronic leak detector), and then raise

the pressure using nitrogen gas (140 PSIG). Do not use R-290 as a mixture with

pressurized air for leak testing.

NOTICE

• Always recover the refrigerant and store it in an approved container. Do not

discharge the refrigerant into the atmosphere.

• Do not leave the system open for longer than 15 minutes when replacing or

servicing parts. The Polyol Ester (POE) oils used in R-290 appliances can absorb

moisture quickly. Therefore it is important to prevent moisture from entering the

system when replacing or servicing parts.

• Always install a new drier every time the sealed refrigeration system is opened.

Do not replace the drier until after all other repair or replacement has been made.

Install the new drier with the arrow on the drier in the direction of the refrigerant

ow.

• When brazing, protect the drier by using a wet cloth to prevent the drier from

overheating. Do not allow the drier to exceed 250°F (121°C).

Refrigerant leaks must be repaired as soon as they are discovered. If not, refrigerant

charge should be recovered from the system until the leak can be repaired.

When repairing a leak:

• Repair the leak properly – Remove the refrigerant, examine the leak source, determine

the reason for the leak, and carry out the proper course of action.

• Before repairing the leak, ensure that the refrigerant has been recovered and the

system purged with nitrogen when brazing.

• Be sure to remove piercing valves attached to the system after repairs are made.

1. Refrigerant Recovery

Using proper refrigerant practices, place piercing valves toward the end (crimped area)

of the high and low-side process tubes, then recover the refrigerant into an approved

container or device.