Replacing Compressors; Compressor Replacement Procedure (Outline) - Toshiba MMY-MAP0804HT8-E Service Manual

11

REPLACING COMPRESSORS

11-1.Compressor Replacement Procedure (Outline)

Is the outdoor unit the only one in the system?
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 faulty compressor
only or all compressors.)
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) (*2).
Perform a leakage check of the failed outdoor unit.
Perform vacuum drying in the failed outdoor unit.
Refrigerant charging
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START
YES
Recover refrigerant
from the failed unit in
accordance with "10
OUTDOOR UNIT
REFRIGERANT
RECOVERY
METHOD".
YES
END
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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.
NO
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.
*2 The SMMS-i (4 series) and the SMMS (3 series) use different
types of compressors.
Be sure to check the service part code.
NO
Replace the faulty 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) New compressors are charged with 1900cc of oil
per unit.
(2) The amount of oil held by an outdoor unit is as
shown below.
MAP0804 , 1004 , 1204
Amount of oil 4300cc
(3) When a compressor is dismantled, it usually
contains 800-1400cc oil.
The amount of oil held by an oil separator is usually
0-1000cc for MAP0804 , MAP1004 , and MAP1204
and 0-1500cc for MAP1404 and MAP1604 .
255
WARNING
WARNING
MAP1404 , 1604
6700cc