Typical C450CCU applications
The following examples describe typical applications for the C450CCU.
Application 1: Controlling the temperature of a walk-in freezer
You can use the C450CCU system to control the temperature of a walk-in freezer using a two-speed
evaporator fan, electric defrost, and pump down control
Figure 8: C450CCU system with temperature control, two-speed evaporator fan, active
electric defrost and pump down control
The C450CCU's relay R1 is factory set to control the refrigeration output and relays R2 and R3 are
factory set to control the evaporator fan. Use a high speed for a two-speed evaporator fan. The
condensing unit control module automatically assigns default output numbers that display on the
system setup screens in the control module UI.
Table 16: C450CCU callouts and descriptions
Callout Description
1 Liquid line solenoid valve
2 Two-speed evaporator fan
3 Warm air in
4 Liquid flow metering device
5 Cool supply air out
6 Defrost heater
7 Compressor
8 Sn1: Space temperature sensor
9 Sn2: Defrost termination sensor
10 Sn3: Suction pressure sensor
11 System 450 C450CCU: R1 and R2 (high-speed)
12 System 450 power module
System 450 Series C450CCU Condensing Unit Control System Technical Bulletin34
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