Carrier 38QB - Manual (Page 9)

Table 6 — Service Data Table 7 — Compressor Data (60 Hz)
UNIT 38QB 015 018 024 030 036 042 048; 060
R-22CHG (lb) 40 6 2 7 2 7 3 7 8 8 5 8 6 8 0
AccuRator-'-' (Bypass iypo)
COOLING CYCLE CHARGING CHART
METHOD
1. Operate unit a minimum of 10 minutes be­
fore checking charge, and after each charge
adjustment.
2. Measure suction pressure by attaching a gage to
outdoor unit suction service port. (See Fig. 6
for correct service port location on cooling cycle.)
3. Measure outdoor (coil inlet) air dry-bulb tem­
perature with service thermometer.
4. Using a sling psychrometer, measure wet-bulb
temperature of air entering indoor unit.
5. Refer to correct Charging Chart. Locate on
curves where outdoor air dry-bulb and indoor
air wet-bulb temperature lines intersect.
6. From intersect point, project vertically down­
ward to chart suction pressure line. Compare
chart suction pressure to unit suction pressure
(Step 2).
7. If unit suction pressure is lower than chart pres­
sure, add refrigerant to system until chart
pressure is reached. If unit suction pressure is
higher than chart pressure, remove refrigerant
until chart pressure is reached.
Unit Single-Phase Compressors
COMPRESSORS OF THE SPLIT CAPACITOR
(PSC) TYPE require an equalized system pressure
to start. When supply voltage is within nameplate
limit and compressor does not start, give compres­
sor a temporary capacitance boost. See Carrier
Standard Service Techniques Manual, Chapter 2,
for details.
Compressor Removal — See Table 7 for com­
pressor information and Fig. 7 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.
UNIT
38QB
V/PH
PRODUCTION COMPRESSOR
Model*
015 REK3-0125-PFV 20 1
018 CRA1-0150-PFV 51 1
024 208-230/1 MD2314GE 44 i
030 MD3214GE 44 j
036 MD3514GE 44 1
042 PC4616BD 64
048 230/1 PC5016BD 64 1
060 PC6016BD 64 1
036 MF3513GE 44
042
048
208-230/3
PY4616AD
PY5016BD 64
64
060 PY6016BF 64 1
036 MH3513GE 44 i
042
460/3
PH4616AD 64 !
048 PH5016BD 64
060 PH6016BF 64
Oil Recharge
Ounces
‘Refer to Service Parts Catalog for replacement compressor
model numbers
STRAINER VAPOR REVERSING
LINE VALVE
ECOIL ACCUMULATOR
MUFFLER SOLENOID HOT GAS
COIL DISCHARGE LINE
COMPRESSOR
Fig. 7 — Component Location
Follow safety codes. Wear safety glasses and
work gloves. Have quenching cloth available.
1. Remove top cover as described in Installation,
Step 1.
2. Disconnect high- and low-voltage field wiring
and fan motor leads from capacitor and
contactor.
3. Remove screws holding discharge grille in place.
Lift grille from unit.
4. 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