Replacing Compressors; Compressor Replacement Procedure (Outline) - Carrier MMY-MAP0724FT9UL Service Manual

12. REPLACING COMPRESSORS

12-1. Compressor Replacement Procedure (Outline)

START
Is the outdoor unit the only one in the system?
YES
Manually open PMV1, 2
and 4 of the failed unit
(by short-circuiting the
pins of CN30 on I/F P.C.
board and turning off the
power switch), and
recover refrigerant using
a refrigerant recovery
device (*1).
Turn off the power switch of the failed outdoor unit.
Dismantle the faulty compressor.
Measure the amount of oil in the faulty compressor.
Check the color of the oil in the faulty compressor.
ASTM grade: Is it 4 or above?
(Judge the condition of the oil against color samples,
and decide whether to replace the replace to the
failed compressor only or all the compressors in the
failed outdoor unit.)
Replace both the faulty compressor and the normal
compressor(s).
Measure the amount of oil in the normal compressor(s).
Adjust the amount of oil according to the oil quantity
measurement result(s).
Install the new compressor(s).
Perform a leakage check of the failed outdoor unit.
Perform vacuum drying in the failed outdoor unit.
Refrigerant charging
END
NO
Recover refrigerant
from the failed unit in
accordance with "11
OUTDOOR UNIT
REFRIGERANT
RECOVERY
METHOD".
YES
In situations such as indoor unit relocation and
repairs, it is not possible to recover all the refrigerant
held by the system in the outdoor units.
It could cause a serious accident, such as blow out or
injury.
Be sure to perform refrigerant recovery using a
refrigerant recovery device.
When detaching a pipe by heating with a burner a
welded joint, take care as any oil left in the piping
may burn in a momentary flash of fire when the weld
filler metal melts.
*1 The full-opening of PMV1, 2 and 4 via short-
circuiting of the CN30 pins is automatically
undone after 2 minutes, causing the valves to fully
close. To maintain fully open state, turn off the
power switch of the outdoor unit within 2 minutes.
This flowchart only shows the standard compressor
replacement procedure. Since the situation can differ
site by site, perform the task in accordance with the
following judgment criteria:
NO
Replace the faulty compressor only.
(1) New compressors are charged with 0.502gal
(1900cc) of oil per unit.
(2) The amount of oil held by an outdoor unit is as
shown below.
(3) When a compressor is dismantled, it usually
contains 0.211 to 0.370gal (800 to 1400cc) oil.
The amount of oil held by an oil separator is
usually 0 to 0.264gal (0 to 1000cc) for MAP072
and 0 to 0.396gal (0 to 1500cc) for MAP096
∗
MAP120
Amount of oil 1.136gal (4300cc)
– 216 –
WARNING
WARNING
∗ ∗
MAP072 MAP096 , 120
1.770gal(6700cc)
∗
∗
and
∗