Heatcraft Refrigeration Products H-IM-79B - Manual (Page 9)

9
SINGLE SYSTEM with MULTIPLE EVAPORATORS
• 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.
• 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.
• 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
CU
M S
S
S
Start-Up Operation