Carrier 38SE - Manual (Page 10)

Carrier Standard Service Techniques Manual, Chapter 2, for
details. Use a 130 mfd start capacitor. Connect wires with
insulated probes to each capacitor terminal. Touch probes
to each side of run capacitor or to compressor motor
terminals R and S. Start compressor;
pull probes away after
3 seconds. Discharge start capacitor. Run compressor for 10
minutes, then shut off and allow system pressure to
equalize. Try restarting without boost capacitor. If after 2
attempts (without boost capacitor) the compressor does
not start, add an accessory start capacitor relay package.
Unit Single-Phase Compressors that are equipped with a
compressor start thermistor (PTC device). If compressor
will not start, check the thermistor with an ohmmeter as
follows;
1. Shut off all power to unit and wait 5 minutes for
thermistor to cool to outdoor temperature.
2. Measure resistance of thermistor with ohmmeter.
Normal resistance readings are 50 to 90 ohms at 75 F
outdoor temperature.
3. If ohmmeter resistance reading is 0 or much higher than
90 ohms, the thermistor is defective and must be
replaced.
If start thermistor (PTC device) is good and compressor
will not start, disconnect the thermistor from starting circuit
and give compressor a temporary capacitance boost as
described above. Run compressor for 10 minutes, then shut
off and allow system pressure to equalize. Reconnect start
thermistor and try restarting compressor without boost ca­
pacitor. If after 2 attempts the compressor does not start,
remove thermistor and add an accessory start capacitor re­
lay package.
Compressor Removal
38GR; 38SE002,003,004 UNITS - See Table 9 for
compressor information and Fig. 8 for component location.
Shut off power to unit. Vent refrigerant to atmosphere or
use refrigerant removal methods shown in Carrier Standard
Service Techniques Manual, Chapter 1.
1. Remove unit top cover (grille). Open or remove service
door.
2. Disconnect fan motor leads from control panel located
on service door. See Fig. 7 and refer to Service Door on
page 3. Remove 6 screws holding fan motor orifice
assembly in place and lift assembly from unit.
3. Compressor outer sound shield is fastened to tube sheets
and to base pan. Loosen screws and remove sound shield
by sliding it straight up using tube sheets as guides.
4. (38SE only) — Warp top cover of inner compressor
sound shield upward to clear compressor process tube.
Carefully slide cover over the tubing.
.TOP GRILLE COVER
FAN MOTOR-ORIFICE
ASSEMBLY
SERVICE
DOOR
SUCTION
LINE
COMPRESSOR
5. (38SE only) — Slide inner compressor sound shield
terminal box cover upward and out.
6. Remove compressor terminal box cover, disconnect and
remove compressor power leads.
7. (38SE only) — Lift off inner compressor sound shield.
8. Unsweat suction and hot-gas lines.
9. Remove compressor hold-down bolts. Lift compressor
out thru top of unit.
Table 9 — Compressor Data
COND
V/PH
PRODUCTION OIL RECHARGE
UNIT COMPRESSOR* (oz)
38GR002--- 38GL400324 40.5
38GR002320 MD2723CB 43.2
38GR003--- 38GR400234 31.5
38GR0033I0 MC3423CB 43.2
38GR004--- 230/1* 38GC401564 45.0
38GR0043IO MC4023CB 43.2
38GR045--- PC4Ó26AD 76 0
38GR005--- PC5326AD 76.0
38GR006--- PC6725AB 76 0
38GR003--- RF3522CJ 50.4
38GR0034Í0 MF3423CB 43 2
38GR004--- RF3922CJ 50 4
38GR0044Í0 200/3 MF4023CB 43.2
38GR045--- PF4626AD 76.0
38GR0£)5--- PF5326AD 76.0
38GR006--- PF6725AA 76 0
38GR003--- RG3522CJ 50.4
38GR0035I0 MG3423CB 43 2
38GR004--- RG3922CJ 50.4
38GR0045Í0 230/3 MG4023CB 43.2
38GR045--- PG4626AD 76.0
38GR005--- PG5326AD 76 0
38GR006--- PG6725AA 76 0
38GR004--- RH3922CJ 50 4
38GR0046Í0 MH4023CB 43 2
38GR045--- 460/3 PH4626AD 76.0
38GR005--- PH5326AD 76.0
38GR006--- PH6725AA 76.0
38SE002--- MD2023CB 43 2
38SE003--- MD2723CB 43.2
38SE004--- 230/1 MC3423CB 43.2
38SE045--- PC4Ó26AD 76 0
38SE055--- PC5326AD 76.0
LIQUID VALVE
SERVICE PORT SUCTION VALVE
SERVICE PORT
JCONTROL
»PANEL
COVER
Fig. 8 — 38GR Condensing Unit with Service Door Open
shown italicized 000.
* Refer to Service Parts catalog for replacement compressor model
numbers. The 38GR.SE single-phase compressors include start
assist.
38SE045,055 UNITS
1. Open and remove service door. See Fig. 7 and refer to
Service Door on page 3.
2. Disconnect fan motor leads and crankcase heater leads
from control panel located on service door.
3. Remove cover plate on compressor terminal box and
disconnect all leads.
4. Remove 4 screws holding compressor plastic sound
shield in place. Slide shield upward 6 to 10 inches.
5. Unsweat suction and hot-gas lines at compressor (dis­
connect convenient connection at sight glass or filter-
drier).
6. Remove 3 screws holding coil to base pan.
7. From front of unit (coil-emblem side) hft complete
disconnected coil-fan-top cover assembly off from
compressor-base pan assembly.
10