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2
REPLACING COMPRESSORS
12-1. Compressor Replacement Procedure (Outline)
NOYES
NO
START
Is the outdoor unit the only one in the system?
Recover refrigerant
from the failed unit in
accordance with “
11
OU
TD
OOR UNIT
REFRIGERANT
RECOVERY
METHOD”.
Manually open PMV1, 3
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.
Remove the troubled compressor.
Check the color of the oil in the troubled compressor.
ASTM grade: Is it 4 or above?
(Judge the condition of the oil against color samples,
and decide whether to replace the troubled
compressor only or all compressors.)
YES
Replace both the troubled compressor and the
normal compressor.
Measure the amount of oil in the normal compressor.
Adjust the amount of oil according to the oil quantity
measurement result(s).
Install the new compressor(s) (*2).
Perform a leakage check of the failed outdoor unit.
Perform
vacuum drying in the failed outdoor unit.
Refrigerant charging
END
Measure the amount of oil in the troubled compressor.
Replace the troubled compressor only.
WARNING
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.
WARNING
When detaching a pipe by heating with a burner at
brazed joint, take care as any oil left in the piping may
burn in a momentary flash of fire when the brazed filler
metal melts.
*
1 The full-opening of PMV1, 3 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.
*
2 The SMMS-e (6 series) and the SMMS-i (4 series) use different
types of compressors.
Be sure to check the service part code.
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:
(1) New compressors are charged with 0.502 gal 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 - 0.370 gal oil.
The amount of oil held by an oil separator is usually
0-0.264 gal for MAP0726∗∗
Model MAP-
0726∗
Amount of oil [gal]
1.136
− 228 -
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