Carrier RBM-Y0613FUL - Page 222

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<MMY-MAP072
∗
, MAP096
∗
and MAP120
∗
>
Check items and procedures to follow when checking oil circuit with compressor(s) disconnected
Check item Location Procedure
Leakage of outdoor PMV
Leakage of check valve in
discharge pipe convergent
section
A,B
C,D
1) Pressure nitrogen from check joint of the liquid pipe under condition that PMV1, 2 and 4 are fully closed,
confirm the pressure using high-pressure check joint.
If pressure of the high-pressure check joint rises, leakage from any of PMV1, 2, 4 (A, B) , check valve (D) and
discharge check valve (C) is considered. Therefore replace all PMV1, 2, 4 (A, B), check valve (D), discharge
check valve (C).
2) If pressure did not rise, open PMV1, 2 fully and then confirm pressure of the high-pressure check joint.
When pressure was up, open fully PMV4 only and confirm pressure of the high-pressure check joint again.
3) When pressure was up, there is leakage from check valve (D) and discharge check valve (C). Therefore
replace them.
If pressure did not rise, there is leakage from discharge check valve. Therefore replace them.
Leakage of check valve in
discharge pipe
E
4) With pressure applied to the check joint of with nitrogen, if gas escapes from the discharge pipe section of the
disconnected compressor, there is a leak from the check valve of discharge pipe (E). Replace the part.
Leakage of check valve in
oil equalization circuit
F
5) With pressure applied to the check joint of with nitrogen, if gas escapes from the oil equalization pipe section
of the disconnected compressor, there is a leak from the oil equalization pipe check valve (F).
Replace the part.
Leakage of SV3A valve G
6) With pressure applied to the check joint of with nitrogen, manually open the SV3B valve. If gas escapes from
the suction pipe section of the disconnected compressor, there is a leak from the SV3A valve.
Replace the part.
Clogging of SV3E valve
Clogging of oil-return distributor
I
8) With pressure applied to the check joint of with nitrogen, manually open the SV3E valve. If gas does not
escape from the suction pipe section of the disconnected compressor, the SV3E valve or oil-return distributor
is clogged. Replace the part.
Clogging of SV3D valve
Clogging of oil-return capillary
Clogging of oil-return distributor
J
9) With pressure applied to the check joint of with nitrogen, manually open the SV3D valve. If gas does not
escape from the suction pipe section of the disconnected compressor, the SV3D valve, oil-return capillary or
oil-return distributor is clogged. Replace the part.
Leakage of SV3B valve H
7) Then manually open the SV3A valve. If gas escapes from the suction pipe section of the disconnected
compressor, there is a leak from the SV3B valve. Replace the part.