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CBX32MV
E ECB40-12.5CB, ‐15CB - 208/230V Single Phase
FIRST-STAGE HEAT
1. W1 of the thermostat provides a W1 demand to the Control. The Control 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)
1. When K32‐1 closes, the unit is ready for a second stage heat demand. W2 of the thermostat provides a W2 demand to
the Control. The Control outputs a 22VDC signal to the K33 and K34 relays.
2. 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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