Toshiba MMY-MUP0801HT7JP, Service Manual

Page: 262 / 309

11. REPLACING COMPRESSORS
11-1. Compressor Replacement Procedure (Outline)
NO YES
NO
START
Is the outdoor unit the only one in the system?
Recover refrigerant
from the troubled unit
in accordance with
“10 OUTDOOR UNIT
REFRIGERANT
RECOVERY
METHOD”. Manually open
PMV1, 2 and 3 of the
troubled unit and
recover refrigerant
using a refrigerant
recovery device (*1).
(Refer to 7-7-6 for
operation method)
Turn off the power switch of the troubled 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 troubled outdoor unit.
Perform vacuum drying in the troubled 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 PMV 1, 2, 3 via rotary switch 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-u and the SMMS-i and SMMS-e use
different types of compressors. Be sure to check
the service part code.
1. The compressors that are used as service parts are filled
with oil as listed below (per 1 compressor):
8, 10, 12, 14, 22, 24HP 1900 cc
14A,
16, 18, 20HP
3000 cc
2. The oil volume that was filled in the outdoor unit is listed
as below:
8, 10, 12, 14HP 3400 cc
14A,
16, 18, 20HP 5000 cc
22, 24HP 5800 cc
3. The removed compressors normally filled with oil as
listed below (per 1 compressor):
Oil separator's oil volume is normally around 0~1000 cc.
8, 10, 12, 14, 22, 24HP 800~1400 cc
14A,
16, 18, 20HP 2000~2600 cc
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:
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