15
Figure 6 - Z120 Cool Mode Refrigeration Diagram
3.2.2 Null
Null mode is when the unit is powered on but reached setpoint. At the time the unit is in null mode. No relays are
activated. The motors, fans, compressors, and solenoid are not activated. The thermostat energizes the power relay
(KMC or K1) at box temperatures higher than set point. The thermostat deenergizes the PR relay when it reaches the
set point. When PR is de-energized the unit does not operate and the unit is in Null mode.
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