Heatcraft Refrigeration Products 25001501 Manuel D’Utilisation

2

•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.

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.

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.