Filter
Top Products
5
14
16
18
19
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 fur-
nace blower is switched on.
NOTE:
If the main burners fail to ig-
nite, the furnace control system will go
through 3 more ignition cycles. Then, if
burners fail to ignite, the system will
lockout. If lockout occurs, or the blower
doesn’t come on—shut down your fur-
nace and call your dealer for service.
12. Set your thermostat to the tempera-
ture that satisfies your comfort re-
quirements. SUGGESTION:
Setting the thermostat back a few
degrees—and compensating for the
difference with warmer clothing—
can make a big difference in your
fuel consumption on extremely
cold days. The few degrees at the
top of your thermostat “comfort
level’’ are the most costly degrees
to obtain.
When the room temperature drops
below the temperature selected on
the thermostat, the furnace will be
switched on automatically. When the
room temperature reaches the degree
selected on the thermostat, the furnace
will be switched off automatically.
Some thermostats have a “fan’’ mode
with 2 selections: AUTO or ON. When
set on AUTO, the furnace blower cy-
cles on and off, controlled by the ther-
mostat. In the ON position, the furnace
blower runs continuously except for a
45-sec delay at the “call for heat.’’ This
keeps the temperature level in your
home more evenly balanced. It also
continuously filters the indoor air.
SHUTTING DOWN
YOUR FURNACE
Should you ever suspect a malfunction
in your furnace, you will need to turn
the furnace off. The following proce-
dures must be followed:
1. Set your room thermostat to
the lowest temperature setting.
(See Fig. 20.)
2. Close the external manual gas
valve. (See Fig. 8 on page 4.)
3. Turn OFF the electrical supply to
your furnace. (See Fig. 21.)
4. Remove the control access door on
your furnace. (See Fig. 10 or 11.)
On upflow furnaces, removing the
blower access door is not required.
O
P
E
N
ON
13
15
O
F
F
2
3
1
M
P
O
N
O
F
F
C
ON
OFF
OR
O
F
F
2
3
1
M
P
ON
O
F
F
C
ON
OFF
OR
17