Carrier 38QF - Manual (Page 12)

Compressor Removal — See Table? for com­
pressor information and Fig. 21 for component
location. Shut off power to unit. Remove refrigerant
from unit using refrigerant removal methods de­
scribed in Carrier Standard Service Techniques
Manual, Chapter 1, Refrigerants.
Be sure system pressure is 0 psig before
proceeding.
Table 7 — Compressor Data (60 Hz)
UNIT
38QF
PRODUCTION COMPRESSOR
V/PH
Model*
Oil Recharge
Ounces
018 230/1 H22B173ABCA 37
024 208-230/1 CRC2-0175-PFV 51
030 208-230/1 CRF1-0250-PFV 51
036 208-230/1 CRG1-0251-PFV 51
042 208-230/1 CRJ1-0301-PFV 51
048 230/1 PC4616CD 66
060 230/1 PC6016BD 66
*Refer to Carrier Service Parts Catalog for replacement com­
pressor model numbers.
STRAINER VAPOR REVERSING
\ LINE VALVE
\
OUTDOOR COIL ACCUMULATOR
MUFFLER SOLENOID
COIL
HOT GAS
DISCHARGE LINE COMPRESSOR
Fig. 21 — Component Location
Follow safety codes. Wear safety glasses and
work gloves. Have quenching cloth available.
CATTIO.N; .'Mumimim tubing is used in unit
coils. Do not o\erlieat or place c.xcessi\c .strain
on lubinii or damce inav result.
1
.
2
.
3
.
Remove top cover as described in Installation,
Step I.
Disconnect high- and low-voltage field wiring
and fan motor leads from capacitor and
contactor.
Remove screws holding discharge grille in place.
Lift grille from unit.
Disconnect compressor leads (crankcase heater,
low-pressure switch, defrost thermostat and
solenoid coil) from electrical components and
pull them thru the wire access opening into the
coil section. Lift fan orifice/control ring after
pinching and pressing down on 3 plastic pins of
tube supports.
5. Remove louvered casing by taking out screws
securing it to the cabinet and sliding it away
from the coil.
Using a midget tubing cutter, cut liquid and
discharge lines on the coil and suction and dis­
charge lines at a convenient place near the com­
pressor for easy reassembly with copper slip
couplings.
C.\LTJO\: F.xcvssivc movement of copper
lines at compressor may cause a break where
lines connect to condenser coil.
6
.
7. After plugging connections, remove condenser
coil by pinching plastic pins of tube supports
that extend into basepan and lift vertically. Set
coil on a clean, flat surface.
8. Remove compressor holddown bolts and slide
out compressor. Remove crankcase heater.
W A R N I N G : For bra/ing and unbrazing
have lire extinguisher and or quenching
cloth available in case oil vapor ignites.
9. Carefully unbraze suction and discharge line
piping stubs from compressor after noting posi­
tion of stubs to assist when reinstalling.
10. Install new compressor, placing crankcase
heater around compressor. Be sure compressor
holddown bolts are in place.
11. Replace coil; braze suction and discharge lines
to compressor piping stubs (at points where cut.
Step 6); rewire compressor and leak test.
12. Replace fan orifice/control ring; connect com­
pressor wires after feeding them thru control
ring; replace fan/grille assembly and rewire;
connect high- and low-voltage power wiring;
and replace louvered casing.
13. Replace top cover by running 4 screws into
orifice loosely (2 on each side of unit) and
tighten when cover is in place. Replace remain­
ing screws.
14. Evacuate and recharge system.
Filter Drier — Install field-supplied filter drier
(Table 3) in system liquid line when refrigerant
system is opened for service as described under
Compressor Removal. Position drier in liquid line
at convenient location.
Pumpdown Procedure — The system may be
pumped down in order to make repairs on low side
without losing complete refrigerant charge.
1. Attach pressure gage to suction service valve
gage port.
2. Frontseat the liquid line valve.
12