Carrier 38MVC, 38MVQ, 40MVC, 40MVQ CHART 3 -- COMPRESSOR OVERCURRENT PROTECTION

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CHART 3 -- COMPRESSOR OVERCURRENT PROTECTION
Is unit running in outdoor
ambient higher than
125 °F?
Beyond operating range
Outdoor coil clean? Clean coil.
Problem persists? Problem solved
Check connections from
OD board. Corrosion, or
high resistance
Outdoor fan Ok?
Connect gauges to unit.
pressures ok?
Check amp draw to
compressor? Values within
range?
Replace outdoor board
Replace compressor
Clean/repair connection
Problem persists? Problem solved
Change outdoor motor
High head, high suction? High head, low suction?
Unit is overcharged.
Reclaim charge and weigh
in correct charge.
Yes
Yes
Yes
Yes
Yes
No
No
No
No No
No
No
Yes
Yes
No
No
Yes
Yes
Restriction in refrigeration
circuit.
Is unit running in outdoor
ambient higher than
125 °F?
Beyond operating range
Outdoor coil clean? Clean coil.
Problem persists? Problem solved
Check connections from
OD board. Corrosion, or
high resistance
Outdoor fan Ok?
Connect gauges to unit.
pressures ok?
Check amp draw to
compressor? Values within
range?
Replace outdoor board
Replace compressor
Clean/repair connection
Problem persists? Problem solved
Change outdoor motor
High head, high suction? High head, low suction?
Unit is overcharged.
Reclaim charge and weigh
in correct charge.
Yes
Yes
Yes
Yes
Yes
No
No
No
No No
No
No
Yes
Yes
No
No
Yes
Yes
Restriction in refrigeration
circuit.
A08168
38/40MVC, MVQ