Table 16: C450CCU callouts and descriptions
Callout Description
13 System 450 expansion module two relays: R3 (low speed) and R4 (defrost)
14 System 450 expansion module one relay: R5 (compressor)
15 Power supply path
16 Power return path
Application 2: Controlling the temperature of a walk-in cooler
You can use the C450CCU system to control the temperature of a walk-in cooler using a two-speed
evaporator fan and passive or off-cycle defrost
The following figure shows an off-cycle defrost control system that has the following features:
• Medium temperature with passive defrost
• Space temperature sensor
• Optional System 450 power module
• Optional two-speed evaporator fan motor control
Figure 9: Off‐cycle defrost control system
Table 17: Off‐cycle defrost control system
Callout Description
1 A99 temperature sensor; Sn-1 space temperature sensor
2 Low- voltage input terminal blocks
3 C450CCU condensing unit control module
4 C450YNN power module
5 C450SBN relay expansion module with one relay output
6 OUTR1, 24 VAC to 240 VAC: Controls refrigeration, either compressor or solenoid valve
35System 450 Series C450CCU Condensing Unit Control System Technical Bulletin
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