Lennox ELITE 10 CB29M Series User Manual

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F–ECB29-20CB – 208/230V SINGLE PHASE – SEQUENCE OF OPERATION
FIRST STAGE HEAT
1- When there is a call for heat, W1 of the thermostat
energizes the electric heat relays K32 and K33
with 24VAC.
2- When K32-1 closes, the blower is energized on
heating speed and economizer heat relay K43 is
energized (see 208/230VAC CB schematic).
3- When K32-1 and K32-2 closes, assuming the N.C.
primary (S15) and secondary (S20) limit switches
are closed, electric heat elements HE1 and HE3
are energized.
4- When K33-2 closes, assuming the N.C. primary
(S15) and secondary (S20) limit switches are
closed, electric heat element HE4 is energized.
SECOND STAGE HEAT
(remove jumper between W2 and R)
5- When K33-1 closes, the unit is ready for a second
stage heat demand. W2 of the thermostat sends a
second stage heat demand, energizing the electric
heat relay K34 with 24VAC.
6- When K34-1 closes, the blower (if not energized) is en-
ergized on heating speed and economizer heat relay
K43 is energized (see 208/230VAC CB schematic).
7- When K34-2 closes, assuming the N.C. primary
(S15) and secondary (S20) limit switches are
closed, electric heat element HE2 is energized.

Lennox ELITE 10 CB29M Series Specifications

General

Brand	Lennox
Model	ELITE 10 CB29M Series
Category	Air Handlers
Language	English