Heatcraft Refrigeration Products 25001501 - Manual (Page 2)

BEACON CONTROLLER
2
QUICK GUIDE
Installation, Start-Up, Operation, Troubleshooting
Installation
•Use 18 gauge wire for 24-volt connections between evaporators and condensing unit.
• Remove suction line sensor before brazing; reinstall suction sensor after brazing is completed and suction
line has cooled; insulate with insulation provided.
• If an electric defrost evaporator is being applied in a medium temperature application, have the nozzle size
checked for proper sizing.
Condensing Unit
• Set transformer primary connection for correct supply voltage (208V or 230V).
• Check low pressure switch time delay relay for correct adjustment to 2 minutes.
• Check low pressure switch for correct adjustment to 0 psig cut-out / 10 psig cut-in.
Evaporator
• Check black jumpers for system settings; change to match your application requirements.
• Board are shipped from factory set for 35
°
F medium temperature or -10
°
F low temperature; change resistor
for set-point temperature to match application requirements.
• Check sensor connections on board; confirm that sensors are plugged onto correct terminals.
• Check expansion valve (EXV) connections on board; confirm that wires are plugged onto correct terminals.
• If system has multiple evaporators, check master/slave wiring: Wire multi-out from master to multi-in on
slave, then from multi-out of slave to multi-in of master.
Start-Up
• After system evacuation add correct refrigerant. It may be necessary to adjust time delay relay (TDR) to 10
minutes, temporarily, to allow system charging. Readjust TDR back to 2 minutes when done.
• In ambient above 75
°
F, charge unit to a clear sight-glass. In colder ambients, raise discharge to 105
°
F
condensing and charge to a clear sight-glass.
• At initial start-up, system may cycle off on low superheat. Let system cycle. It may take 4 to 5 cycles for
system to settle out.
• If Smart Controller is used, make sure “Defrost End Temp.” on the Beacon board is set to 50
°
F.
• If multiple evaporators are connected to a condensing unit, the room sensor must be connected to the
master evaporator only. Disconnect the room sensor from all the other boards.
Sequence of Operation
Cooling
• The Beacon system has a built-in 4 minutes hold on / 4 minutes hold off cycle. The system will “run” in
cooling a minimum of 4 minutes and stay “off” a minimum of 4 minutes.
• When power is first applied, the system will not start for 4 minutes.
• After 4 minutes, the expansion valve opens and the compressor contactor circuit is energized shortly after
the valve opens.
• When the system is cooling, the expansion valve is adjusted at 2 minutes intervals to obtain the set
superheat. If the superheat falls too low, the expansion valve is adjusted at a much faster rate to bring the
superheat up.
• When the room temperature is obtained, the expansion valve is closed and the system is pumped down until
the low pressure switch opens or 2 minutes have elapsed.