Lennox CBX40UHV Series Unit Information page 49

B−ECB40−2.5, 4, 5 AND ECB40−4CB, 5CB 208/230V SINGLE PHASE − SEQUENCE OF
OPERATION
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.
CBX40UHV
1
1
Page 49
2