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CHA16 P VOLTAGE
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2
3
4
5
6
4
SEQUENCE OF OPERATION
Cooling:
1- Line voltage energizes transformer T1. Transformer T1 provides
24VAC power to all unit controls and thermostat.
2- Cooling demand energizes Y1 and G in the thermostat. Y1 energizes
compressor contactor K1 and G energizes indoor blower relay K3.
3- K1-1 closes to energize compressor and condenser fan.
4- K3-2 switches to energize blower on high speed. K3-1 switches to
power the economizer (if equipped). Dampers open to minimum posiĆ
tion.
Heating:
5-Heating demand initiates at W1 in the thermostat and passes through to
ECH16.
See Electric Heat Sequence of 0peration.
Units equipped with reciprocating compressors:
6-As compressor gains speed, compressor terminal S is powered by start
capacitor C7. When compressor nears full speed potential relay K31 is
energized and the start capacitor is taken out of the circuit. K31 reĆ
mains energized during compressor operation.
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