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| STATUS INDICATOR LED |
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| • | ERRORS | E 1 | - | Room temperature sensor shorted, open or not installed |
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| E 2 | - | Defrost temperature sensor shorted, open or not installed |
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| E 3 | - | Suction temperature sensor shorted, open or not installed |
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| E 4 | - | Suction pressure transducer shorted, open or not installed |
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| E 5 | - | Outdoor temperature sensor shorted |
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| E 6 | - | Low superheat during cooling |
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| E 7 | - | Compressor shutdown |
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| E 9 | - | (high or low refrigerant pressure or low oil pressure) |
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| • | OTHERS | Coo - | Room Temperature sensor open or not connected |
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| Loc - | (Instead of displaying box temperature) |
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| Board is locked. Settings cannot be changed |
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| UnL - | Unlock the board settings |
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Low Ambient Operation
All units are shipped standard with Head Master valves. (Scroll compressor units have a 100 PSI Head Master
valve and all other systems have a 180 PSI head master valve.) Condensing units with multiple condenser fans will have one or more fans cycle on Pressure Fan Cycling
switch.
An adjustable Time Delay relay, factory set at 1 minute, is wired across the Low Pressure switch (LPS). In cold ambient this allows time for the suction pressure to build up and prevent nuisance tripping of the LPS.
Pumpdown
When any of these three conditions occurs the compressor will turn off and not restart until there is a call for cooling or a periodic pumpdown.
Periodic Pumpdown
While in the OFF cycle, if there isn’t a call for cooling (Box setpoint temperature is met) but:
•The evaporator suction pressure has risen to 10 psig
•The low pressure switch has closed
At the end of each cooling cycle, when the box temperature is met, the Beacon system will pump down and shut off the compressor.
To pumpdown, the EEV closes and the compressor runs until one of the following occurs:
•The low pressure switch opens
•The suction pressure at the evaporator is 4 psig
•A total of two minutes has elapsed
The system will initiate pumpdown. This periodic pumpdown will occur at 4 minute intervals when these two conditions are met.
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