Replacing Compressors; Compressor Replacement Procedure (Outline) - Toshiba MMY-MUP0961HT6P-UL Service Manual

11. REPLACING COMPRESSORS

11-1. Compressor Replacement Procedure (Outline)

START
Is the outdoor unit the only one in the system?
YES
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.
Measure the amount of oil in 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.)
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
NO
Recover refrigerant
from the troubled unit
in accordance with
"10 OUTDOOR UNIT
REFRIGERANT
RECOVERY
METHOD".
YES
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.
NO
Replace the troubled compressor only.
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. The compressors that are used as service parts are filled
with oil as listed below (per 1 compressor):
Standard 6,8,16 ton
High heat 6 ton
Standard 10,12,14 ton
High heat 8,10 ton
2. The oil volume that was filled in the outdoor unit is listed
as below:
Standard 6,8 ton
High heat 6 ton
Standard 10,12,14 ton
High heat 8,10 ton
Standard 16 ton
3. The removed compressors normally filled with oil as
listed below (per 1 compressor):
Standard 6,8,16 ton
High heat 6 ton
Standard 10,12,14 ton
High heat 8,10 ton
Oil separator's oil volume is normally around 0~1000 cc.
- 265 -
0.502 gal
0.793 gal
0.898 gal
1.321 gal
1.532 gal
0.211 ~ 0.370 gal
0.528 ~ 0.687 gal