COZY HEDV254A Installation And Operating Instructions Manual page 13

HEDV SEQUENCE OF OPERATION
0Q
r_ STEP #
-- 1)
L;O
2)
3)
4)
5)
6)
7)
s)
9)
lO)
11)
12)
13)
closes pro_h_g __
indt_cer
NO
4 Sec
Thermostat calls tbr heat.
Draft Inducer turns on.
Pressure switch closes.
Spark ignition beans.
Gas flow-to burner.
Burner ignition proven.
Circulating Blower on.
Heater bums through heating cycle.
Thermostat satisfied.
Gas flow off to burner.
Draft inducer off:
Circulating Blowers oft:
Heater in stand-by.
val,
gas f
to bur
i i1_ __ _3(3 Sec. 18(I Sec
_s [31oxlei
)w
NOTE: IF THERE IS A MALFUNCTION IN STEPS 3, 5, 6 THE OPERATION SEQUENCE WILL STOPAT THAT
POINT. FOR STEPS 5 OR6, IF AFTER 2 ADDITIONALATTEMPTS MALFUNCTION STILL OCCURS, THE CON-
TROL WILL LOCK OUT FOR ONE HOUR. FOR PURPOSE OF TESTING, THE ONE HOUR LOCKOUT CAN BE
OVERRIDDEN BY RESETTING TIlE THERMOSTAT OR INTERRUPTING THE ELECTRICAL POWER.