Compressor Replacement; 30Mp Cooler And 30Mpw Condenser; Brazed-Plate Cooler And Condenser Heat Exchanger Replacement; Compressor Location - Carrier AquaSnap 30MPA Series Controls, Start-Up, Operation, Service, And Troubleshooting

Compressor Replacement —
scroll compressors and have two or three compressors. A com-
pressor is most easily removed from the side of the unit or
above, depending on where clearance space was allowed
during unit installation. See Fig. 29.
Remove the junction box cover bolts and disconnect the
compressor power and crankcase heater connections. Remove
the cable from the compressor junction box. Remove the con-
nections from the high-pressure switch. Remove the crankcase
heater. Knock the same holes out of the new compressor junc-
tion box and install the cable connectors from the old
compressor.
The compressors are bolted to rails, which are in turn bolted
to the unit basepan for all sizes. Remove the 4 bolts holding the
compressor to the rail on the basepan. Save the mounting hard-
ware for use with the new compressor. Carefully cut the com-
pressor suction and discharge lines with a tubing cutter as close
to the compressor as feasible. Remove high-pressure switch
and pressure transducer(s) if required for compressor removal.
Lift one corner of the compressor at a time and remove all the
steel spacers. Remove the old compressor from the unit.
Slide the new compressor in place on the rails. Lifting one
side of the compressor at a time, replace all of the compressor
mounting hardware. Using new tubing as required, reconnect
compressor suction and discharge lines. Using hardware saved,
reinstall the mounting bolts and washers through the compres-
sor feet. Using proper techniques, braze suction and discharge
lines and check for leaks. Reconnect oil equalization line.
Re-install the crankcase heater. Reconnect the compressor
power connections and high-pressure switch wiring as on the
old compressor. Refer to Fig. 29. Following the installation of
the new compressor, tighten all hardware to the following
specifications. (See Tables 41 and 42.)
LEGEND
CWFS — Chilled Water Flow Switch
DPT — Discharge Pressure Transducer
EWT — Entering Water Thermistor
HPS — High Pressure Switch
LWT — Leaving Water Thermistor
RGT — Return Gas Thermistor (Optional)
SPT — Suction Pressure Transducer
a30-5049
Fig. 29 — Compressor Location — 30MP015-045 Units (30MPW045 Unit Shown)
All models contain
44
Table 41 — Unit Torque Specification,
30MP015-045
FASTENER
Compressor Mounting
Bolts
Compressor Power
Connections
Compressor Ground
Terminal Connections
Table 42 — Unit Torque Specification,
30MP050-071
FASTENER
Compressor Mounting
Bolts
Compressor Power
Connections
Compressor Ground
Terminal Connections

30MP Cooler and 30MPW Condenser

BRAZED-PLATE COOLER AND CONDENSER HEAT
EXCHANGER REPLACEMENT — Brazed-plate heat ex-
changers cannot be repaired if they develop a leak. If a leak
(refrigerant or water) develops, the heat exchanger must be
replaced. To replace a brazed plate heat exchanger:
1. Disconnect the liquid-in and liquid-out connections at the
heat exchanger.
2. Check that the replacement heat exchanger is the same as
the original heat exchanger. For the condensers, compare
part numbers on the heat exchangers. For the coolers, in-
sulation covers the manufacturer's part number. Make
sure the depths of the replacement and original cooler
heat exchangers are the same.
3. Recover the refrigerant from the system, and unsolder the
refrigerant-in and refrigerant-out connections.
HPS
RECOMMENDED TORQUE
7 to 10 ft-lb (9.5 to 13.5 N-m)
2 to 2.33 ft-lb (2.7 to 3.16 N-m)
1.2 to 1.5 ft-lb (1.6 to 2.0 N-m)
RECOMMENDED TORQUE
7 to 10 ft-lb (9.5 to 13.5 N-m)
3.33 to 3.75 ft-lb (4.5 to 5.1 N-m)
3.33 to 3.75 ft-lb (4.5 to 5.1 N-m)
DPT
RGT
SPT
EWT
(HIDDEN)
CWFS
LWT