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SERVICING
42
NOTE: The Flushing Method using R-11 refrigerant is no longer
approved by Goodman
®
Manufacturing Company, L.P.
Suction Line Drier Clean-Up Method
The POE oils used with R410A refrigerant is an excellent sol-
vent. In the case of a burnout, the POE oils will remove any
burnout residue left in the system. If not captured by the refrig-
erant filter, they will collect in the compressor or other system
components, causing a failure of the replacement compressor
and/or spread contaminants throughout the system, damag-
ing additional components.
Use AMANA
®
brand part number RF000127 suction line filter
drier kit. This drier should be installed as close to the com-
pressor suction fitting as possible. The filter must be acces-
sible and be rechecked for a pressure drop after the system
has operated for a time. It may be necessary to use new tub-
ing and form as required.
NOTE: At least twelve (12) inches of the suction line immedi-
ately out of the compressor stub must be discarded due to
burned residue and contaminates.
1. Remove compressor discharge line strainer.
2. Remove the liquid line drier and expansion valve.
3 Purge all remaining components with dry nitrogen or car-
bon dioxide until clean.
4. Install new components including liquid line drier.
5. Braze all joints, leak test, evacuate, and recharge system.
6. Start up the unit and record the pressure drop across the
drier.
7. Continue to run the system for a minimum of twelve (12)
hours and recheck the pressure drop across the drier. Pres-
sure drop should not exceed 6 PSIG.
8. Continue to run the system for several days, repeatedly
checking pressure drop across the suction line drier. If the
pressure drop never exceeds the 6 PSIG, the drier has
trapped the contaminants. Remove the suction line drier
from the system.
9. If the pressure drop becomes greater, then it must be re-
placed and steps 5 through 9 repeated until it does not
exceed 6 PSIG.
NOTICE: Regardless, the cause for burnout must be deter-
mined and corrected before the new compressor is started.
S-122 REVERSING VALVE REPLACEMENT
Remove the refrigerant charge from the system.
When brazing a reversing valve into the system, it is of ex-
treme importance that the temperature of the valve does not
exceed 250°F. at any time.
Wrap the reversing valve with a large rag saturated with water.
"Re-wet" the rag and thoroughly cool the valve after each braz-
ing operation of the four joints involved. The wet rag around the
reversing valve will eliminate conduction of heat to the valve
body when brazing the line connection.
The use of a wet rag sometimes can be a nuisance. There are
commercial grades of heat absorbing paste that may be sub-
stituted.
After the valve has been installed, leak test, evacuate and re-
charge.