5
11. After 15 to 70 sec, the gas valve
permits gas to flow to the main
burners where it is ignited. Hot
flames begin to warm the
furnace’s heat exchanger. After
a time delay of approximately
45 sec, the furnace blower is
switched on.
12
13
14
15
16
17
18
19
NOTE:
If the main burners fail to
ignite, the furnace control system will
go through 3 more ignition cycles. If
burners still fail to ignite, the system
will lockout. (Under some circum-
stances the furnace may reset from
lockout and attempt to ignite if a call
for heat still exists.) If lockout occurs
or the blower does not come on, refer
F
F
O
ON
O
P
E
N
O
F
F
2
3
1
M
P
ON
O
F
F
C
ON
OFF
OR
O
F
F
2
3
1
M
P
ON
O
F
F
C
ON
OFF
OR
