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STATUSINDICATORLED
• ERRORS E1 - Room temperature sensor shorted, open or not installed
E2 - Defrost temperature sensor shorted, open or not installed
E3 - Suction temperature sensor shorted, open or not installed
E4 - Suction pressure transducer shorted, open or not installed
E5 - Outdoor temperature sensor shorted
E6 - Low superheat during cooling
E7 - Compressor shutdown
(high or low refrigerant pressure or low oil pressure)
E9 - Multi-in/Multi-out wiring error
• OTHERS Coo - Room Temperature sensor open or not connected
(Instead of displaying box temperature)
Loc - Board is locked. Settings cannot be changed
UnL - Unlock the board settings
LowAmbientOperation
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 multiplecondenserfans
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
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
StatusIndicatorLED
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.
PeriodicPumpdown
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
The system will initiate pumpdown. This periodic
pumpdown will occur at 4 minute intervals when these
two conditions are met.