Carrier 38AH044-134 - Manual (Page 49)

TRANSFORMERS
e
TIMERS
TIME-DELAY
RELAY
FAN CONTACTORS
COMPRESSOR
CIRCUIT
BREAKERS
FAN CIRCUIT
BREAKER
TERMINAL
BLOCKS
OIL PRESSURE
SWITCHES
COMPRESSOR
CONTACTORS
Fig. 48 — Unit Controi Box
TOP OF VENTURI
ON FAN DECK
.
(13 mm)
TOP OF VENTURI
ON FAN DECK
ALL 50-Hz
UNITS
NOTE: Fan rotation is ciockwise when viewed from top of unit.
Fig. 49 — Condenser Fan Adjustment
Required Compressor Modification for 38AH044-
084 Optional Single-Circuit Units, When Com­
pressor A1 is Out — To maintain unit operation, com­
pressor no. 1 must be operable. If it is not operable, the following
temporary modifications must be made to keep the unit
running:
1. Change the oil pressure switch connections from com­
pressor A1 to compressor A2.
2. Connect compressor A2 into the Time Guard® circuit as
compressor A1 was originally.
3. Open compressor A1 circuit breaker.
NOTE: Make sure the crankcase heaters are energized when
compressors are off.
Compressor Removal — Access to the pump end of
the compressor is from the compressor side of the unit. Ac­
cess to the motor end of the compressor is from the inside
of the unit. All compressors can be removed from the com­
pressor side of the unit.
IMPORTANT: All compressor mounting hardware and
support brackets removed during servicing must be re­
installed prior to start-up.
1. Disconnect power to unit; lockout power to compressor.
2. Close suction and discharge service valves.
3. Relieve refrigerant pressure into a refrigerant recovery
system.
4. Remove:
a. Fan-cycling pressure switch (FCPS)
b. High-pressure switch
c. Low-pressure switch
d. Oil-pressure switch
e. Discharge gas temperature switch.
5. Disconnect power wires at terminal box and disconnect
conduit.
6. Disconnect wires from crankcase heater.
7. Disconnect service valves from compressor.
NOTE: On 38AH044-084 optional single-circuit units and
units with 2 compressors per circuit, disconnect both oil
equalizer lines located on the motor barrel and on the oil
pump sump.
8. Units 38AH044-084, 124, and 134:
a. Remove 4 large screws securing compressor mount­
ing pan to unit base rail.
b. Slide compressor (on mounting pan) to outside of unit
frame; support and/or lower to ground.
c. Unbolt compressor from mounting pan and remove.
49