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CHA16 Y VOLTAGE
1
2
3
4
5
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.
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