CSR-20 & CSR-40, September 1999
Electrical, Refrigeration and
µ
P-D Menu Flow Diagrams
Schematic Circuit Tracings
9-21
1
Typical model shown with three evaporator fans.
2
A complex algorithm will typically turn the condenser fan ON when the compressor discharge temperature is above
50 C (122 F) and increasing, or when the condenser temperature is above 35 C (95 F).
3
Evaporator fans operate on low speed when Economy Mode is set to ON in the Program menu of the
µ
P-D controller
and the container temperature is In-range.
4
Warm gas bypass valve pulses ON and OFF when calculated temperature differential is less than 0.6 C (1.0 F).
Modulation Mode
1
— Chill Load (Setpoint at -9.9 C [14.1 F] or Above); Condenser Fan OFF
2
; Economy Mode
ON
3
; Temperature In-range, Warm Gas Bypass Valve ON
4
