Unit Protection Module (UPM) Fault Indications
Each unit includes one Unit Protection Module (UPM) printed circuit board and each UPM has two LED indictor lights.
LED | LED Fault Indication | |
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Lockout Reset
A hard lockout can be reset by turning the unit thermostat off and then back on when the “RESET” dip switch is set to “Y” or by shutting off unit power at the circuit breaker when the “RESET” dip switch is set to “R”.
Green | Power LED indicates | ||
the board |
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| Dual or | # of |
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| Single | Status | |
| blinks | ||
| Compressor |
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| 1 | High pressure lockout |
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| Compressor 1 | |
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| 2 | Low pressure lockout |
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| Compressor 1 | |
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| 3 | High pressure lockout |
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| Compressor 2 | |
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| 4 | Low pressure lockout |
| Dual | Compressor 2 | |
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| Compressor |
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| 5 | Freeze sensor lockout | |
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| (optional item) | |
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| Condensate overflow |
Red |
| 6 | in coil drain pan |
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| (optional item) |
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| Brownout AC voltage |
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| 7 | to R and C terminal |
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| below 18 VAC |
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| 1 | High pressure lockout |
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| 2 | Low pressure lockout |
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| 3 | Freeze sensor lockout |
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| (optional item) | |
| Single |
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| Condensate overflow | |
| Compressor |
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| 4 | in coil drain pan | |
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| (optional item) |
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| Brownout AC voltage |
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| 5 | to R and C terminals |
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| below 18 VAC |
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Intelligent Reset
If a fault condition is initiated, the five minute delay on break time period and the random start timer is initiated and the unit will restart after these delays expire. During this period the fault LED will indicate the cause of the fault. If the fault condition occurs 2 or 4 times (depending on 2 or 4 setting for Lockout dip switch) before 60 minutes, the unit will go into a hard lockout and requires a manual lockout reset. A single condensate overflow fault will cause the unit to go into a hard lockout immediately, and will require a manual lockout reset.
Your UPM board will come from the factory with the following default settings:
Default Settings
Freeze | NO |
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Temp | 35° |
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Lockout | 2 |
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Reset | T |
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Alarm | CONT |
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Test | NO |
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Hot/Dry Alarm | HOT |
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Model