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G−ECB40−8, 10 AND ECB40-15CB − 208/230V THREE PHASE − SEQUENCE OF OPERATION
FIRST−STAGE HEAT
1. W1 of the thermostat provides a W1 demand to the AHC. The AHC outputs a 22VDC signal to the K32 relay. K32−1 closes.
2. Assuming the N.C. primary (S15) and secondary (S20) limit switches are closed, electric heat element HE1 is energized.
SECOND−STAGE HEAT (remove jumper between W2 and R)
3. When K32-1 closes, the unit is ready for a second stage heat demand. W2 of the thermostat provides a W2 demand
to the AHC. The AHC outputs a 22VDC signal to the K33 and K34 relays.
4. When K33-1 and K34−1 close, assuming the N.C. primary (S15) and secondary (S20) limit switches are closed,
electric heat elements HE2 and HE3 are energized.
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CBX40UHV
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