Bryant 541A - Manual (Page 14)

E. Oil Charge (Table 1)
Allow unit to run for about 20 minutes. Stop unit and check
compressor oil level. Add oil only if necessary to bring oil into
view in sight glass. Refer to Preliminary Oil Charge section
on page 12. Use only approved compressor oil.
F. Check Operation
Ensure operation of all safety controls. Replace all service pan-
els. Be sure that control panel cover is closed tightly.
IX. RESTART
Manual reset of the 24-v control circuit is necessary if unit
shutdown is caused by automatic reset devices (including IP
[internal compressor overcurrent protection], HPS [high-
pressure switch], and LCS [loss-of-charge switch]) or if
shutdown is caused by manual reset devices (including OPS
[oil pressure switch] and compressor circuit breaker protec-
tion). To restart the unit when IP, HPS, or LCS has tripped
(after device has reset automatically), open and then close the
thermostat contacts. Opening and then closing thermostat con-
tacts interrupts and restores 24-v power to the compressor
lockout (CLO), which resets the circuit.
It is necessary to manually reset the compressor circuit breaker
and OPS at the unit if either of these safeties should shut
down the unit.
IMPORTANT: If OPS trips, it must be reset first before mak-
ing and breaking the thermostat contacts to reset CLO. If this
procedure is not followed, the CLO cannot reset.
X. CAUSES OF COMPLETE UNIT SHUTDOWN:
• interruption of supplied power
• open compressor overtemperature protection (IP)
• compressor electrical overload protection (CB)
• open high-pressure or loss-of-charge safety switches
• open oil pressure switch
• open crankcase heater lockout (CLO2)
• open control circuit fuse (FU1 or FU2)
SERVICE
I. COMPRESSOR REMOVAL
See Table 1 for compressor information and Fig. 2 for com-
ponent location. Follow safety codes and wear safety glasses
and work gloves.
1. Shut off power to unit. Remove unit access panel (front
of unit).
2. Recover refrigerant from system using refrigerant
recovery methods described in Training booklet GTAC
II, Module 5, and in accordance with local and na-
tional standards.
3. Disconnect compressor wiring at compressor terminal
box.
4. Remove bolts from suction and discharge service valves.
5. Remove 2 bolts and 2 screws from compressor mount-
ing plate.
CAUTION: Excessive movement of copper lines at
compressor may cause higher levels of vibration when
unit is restored to service.
6. Remove crankcase heater from compressor base.
7. Remove compressor from unit.
8. Remove compressor holddown bolts and lift compres-
sor off mounting plate.
9. Clean system. Add new liquid line filter drier.
10. Install new compressor on compressor mounting plate
and position in unit. Connect suction and discharge lines
to compressor. Secure mounting plate with compressor
to unit. Ensure that compressor holddown bolts are in
place. Connect wiring. Install crankcase heater.
11. Evacuate and recharge unit.
12. Restore unit power.
Fig. 12 — Cooling Cycle Charging Chart,
541A120
Fig. 13 — Cooling Cycle Charging Chart,
541A180
—14—