Heatcraft Refrigeration Products II - Manual (Page 16)

16
Beacon II Controller
Initial Power On
At the initial application of power to the system, the compressor and the evaporator fans will be in a 4-minute
hold-off cycle and will not start immediately. When there is a call for COOLING, the expansion valve (EEV)
opens, then the compressor is started. The compressor will then run for a minimum of 2 minutes in the “hold-
on” cycle. (This means that the compressor will run for a minimum of 2 minutes before shutting off even if the
box temperature is met).
The LED alternately displays BOX TEMPERATURE and MORE of operation. On a call for cooling, dLY will
show while the expansion valve is opening. After the compressor starts, the LED will alternately display BOX
TEMPERATURE and Coo .
When the room thermostat setting is satisfied, and if the compressor ran for at least 2 minutes, the EEV will
close and the compressor will pumpdown and shut off. The evaporator fans will continue to run. The LED will
alternately display
oFF and BOX TEMPERATURE .
When the room sensor detects a rise in temperature of approximately 2°F, and the compressor has been off
for at least 4 minutes, the EEV will open to its last position then the compressor will start. The valve is then
adjusted as necessary to obtain the setpoint superheat setting. During this time, the compressor will run for a
minimum 2 minutes “hold-on” cycle.
The 4 minute “hold-off” can be bypassed and the system started immediately by pressing the “Reset” button
on the Beacon II board.
Figure 14. Operating Mode Display
oFF – Off
Coo – Cooling
Pdn – Pumpdown
dEF – Defrost
drn – Draining
dLY – Delay
tSt – Test
SEr – Service