19
Status Indicator LED (continued)
Status LED Display Description
• 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 Loc Board is locked. Settings cannot be changed
UnL Unlock the board settings
Pumpdown
At the end of each cooling cycle, when the box temper-
ature is met and the minimum hold-on time has been
satised, the Beacon II system will pump-down and shut
off the compressor.
To pumpdown, the EEV closes and the compressor runs
until the low pressure switch opens or 2 minutes has
elapsed. The compressor is then off and remains off until
the start of the next cooling cycle.
While in the off cycle, the system will initiate a short
pumpdown at 4-minute intervals, only if the Low
Pressure Switch closes, to ensure that any refrigerant
leakage will not cause a problem.
For Manual Pumpdown, a single pole, single throw
switch can be used to connect “SERVICE” and
“Com”. This can be done at the Beacon II board on the
evaporator or at the terminal board in the condensing
unit. This will cause the system to pump down and shut
off.
Note: The system will not restart until the switch has been
opened. The Beacon II board will display “SEr”.
or
The system can be pumped down by pressing the
“SERVICE” button twice. To restart the system, press the
“CLEAR” button.
or
The system can be pumped down for service by closing
the liquid line service valve on the receivers in the
condensing unit, then closing the suction line service valve
when the system trips on the low pressure switch.
Beacon II Controller
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