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<MMY-MUP0721*,0961* and 072H1*>
Check items and procedures to follow when checking oil circuit with compressor(s) disconnected
Check item
Location
Leakage of outdoor PMV
Leakage of check valve in
discharge pipe convergent
section
Clogging of SV3D valve
Clogging of oil-return capillary
Clogging of oil-return distributor
Outdoor Unit
Standard 6,8 ton / High heat 6 ton
Model: MMY-MUP0721*, MUP0961*, MUP072H1*
1) With PMV 1, 2 and 4 fully closed, apply pressure to the check joint of liquid pipe with nitrogen, and check the
pressure at the check joint of discharge pipe.
If the pressure at the check joint of discharge pipe increases, there is a leak from PMV1 (A) or PMV2 (B) and
A, B, D
check valve of discharge pipe (D). Replace the troubled parts.
2) If the pressure does not increase, fully open outdoor PMV 1, 2 and check the pressure at the check joint of
discharge pipe again.
If the pressure increases, there is a leak from the check valve of discharge pipe (D). Replace the part.
3) With pressure applied to the check joint of discharge pipe with nitrogen, manually open the SV3D valve. If gas
F
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.
Procedure
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Table of Contents
Troubleshooting
