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C-ECB29‐8, 8CB 208/230V SINGLE PHASE - SEQUENCE OF OPERATION
1- When there is a call for heat, W1 of the thermostat ener
gizes the electric heat relays K32 and K33 with 24VAC.
2- When K32‐1 closes, the blower is energized on heat
ing speed.
3- When K32‐2 and K32-3 close, assuming N.C. prima
ry (S15) and the secondary (S20) limit switches are
closed, electric heat element HE1 is energized.
4- When K33‐1 and K33-2 close, assuming N.C. prima
ry (S10) and the secondary (S20) limit switches are
closed, electric heat element HE2 is energized.
537816-01
Form
No.
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