Friedrich YL24J35A, Service & Parts Manual

Page: 25 / 62

TTJ-0198 (10/97) (Page 25 of 64)
11. Break vacuum by charging system from the high
side with the correct amount of refrigerant speci-
fied. This will prevent boiling the oil out of the crank-
case.
NOTE: If the entire charge will not enter the high
side, allow the remainder to enter the low
side in small increments while operating the
unit.
12. Restart unit several times after allowing pressures
to stabilize. Pinch off process tubes, cut and sol-
der the ends. Remove pinch off tool, and leak
check the process tube ends.
SPECIAL PROCEDURE IN THE CASE OF
MOTOR COMPRESSOR BURNOUT
1. Recover all refrigerant and oil from the system.
2. Remove compressor, capillary tube and filter drier
from the system.
3. Flush evaporator condenser and all connecting
tubing with dry nitrogen or equivalent, to remove
all contamination from system. Inspect suction and
discharge line for carbon deposits. Remove and
clean if necessary.
4. Reassemble the system, including new drier
strainer and capillary tube.
5. Proceed with processing as outlined under her-
metic component replacement.
ROTARY COMPRESSOR SPECIAL
TROUBLESHOOTING AND SERVICE
Basically, troubleshooting and servicing rotary compres-
sors is the same as on the reciprocating compressor
with only a few exceptions.
1. Because of the spinning motion of the rotary, the
mounts are critical. If vibration is present, check
the mounts carefully.
2. The electrical terminals on the rotary are in a dif-
ferent order than the reciprocating compressors.
The terminal markings are on the cover gasket.
Use your wiring diagram to insure correct con-
nections.
REFRIGERANT CHARGE
1. The refrigerant charge is extremely critical. Mea-
sure charge carefully - as exact as possible to the
nameplate charge.
2. The correct method for charging the rotary is to in-
troduce liquid refrigerant into the high side of the
system with the unit off. Then start compressor and
enter the balance of the charge, gas only, into the
low side.
The introduction of liquid into the low side, without
the use of a capillary tube, will cause damage to
the discharge valve of the rotary compressor.
NOTE: All inoperative compressors returned to
Friedrich must have all lines proper ly
plugged with the plugs from the replace-
ment compressor.