CSR-20 & CSR-40, September 1999
Electrical, Refrigeration and µP-D Menu Flow Diagrams Schematic Circuit Tracings 9-27
1
Typical model shown with three evaporator fans.
2
Controller stops the compressor. If the condenser fan was ON, it will operate for 30 seconds and then stop.
3
Evaporator fans stop during Null mode when Economy Mode is set to ON in the Program menu of the µP-D con-
troller. During Economy Mode operation, a Null state timer automatically starts and operates the evaporator fans on
low speed for 5 minutes every 45 minutes. The unit remains in Null until the return air temperature increases to 1.0 C
(1.8 F) above setpoint at the expiration of a 45 minute Null state time sequence.
Null Mode
1
— Frozen Load (Setpoint at -10.0 C [14.0 F] or Below); Condenser Fan OFF
2
; Economy Mode ON
3
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