heatcraft-refrigeration-p h-im-79d User Manual

•

Check all wiring connections to be sure they are correct and tight.

•

On Condensing unit

-

Check the setting of Time Delay relay. It should be set at 1 minute (the
second marker).

-

Check the Low Pressure switch setting on freezer units. It must be set to 0
PSIG cutout, 10 PSIG cut-in to allow positive start and operation, especially in
cold ambient. This can be changed to a higher value in warmer climates. On
cooler units, the Low Pressure switch has a fixed setting and cannot be
adjusted.

•

Turn power on.

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On MASTER evaporator

-

DO NOT REMOVE the Room Sensor from any evaporator

-

Use the “PROGRAM REVIEW” button to scroll through settings.

-

Check “

rEF” (Refrigerant Type). Factory defaults are: air defrost R-22, electric

defrost R-404A. Change to the refrigerant being used.

-

Check 

“bot” (Box Temperature). Factory defaults are: air defrost 35

°

F and

electric defrost –10

°

F. Change to the desired temperature.

-

Review and change other setting if necessary.

-

See procedures below on how to change settings.

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On SLAVE evaporators. All Beacon II boards are shipped with the factory default as
a “MASTER” evaporator.

- DO NOT REMOVE the Room Sensor from any evaporator
- Each SLAVE Evaporator must be changed to identify it as a SLAVE.  Use the

“PROGRAM REVIEW” button to scroll until 

“SLA” appears, then use the

“SELECT” knob to select “YES” then press “ENTER”.

M = Master Evaporator

S = Slave Evaporator

CU = Condensing Unit