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the floor. If you smell gas,
STOP!
Follow “B” in the safety information
above on this furnace label. If you
don’t smell gas, go to the next step.
• If a suspected malfunction occurs
with your gas control system, such as
the burners not lighting when they
should, refer to the shutdown proce-
dures on inside of main furnace door,
or in the “Shutting Down Your Fur-
nace” section and call your dealer as
soon as possible.
CHECK AIR FILTER:
Before
attempting to start your furnace, be
sure the furnace air filter is clean and in
place. See “Performing Routine Main-
tenance” section in this manual.
Then proceed as follows:
STEPS FOR STARTING
YOUR FURNACE
1. Set your room thermostat to the
lowest temperature setting.
(See Fig. 8.)
a
8
9
WARNING
If overheating occurs or the
gas valve fails to shut off the
gas supply, turn off the exter-
nal manual gas valve to the
furnace BEFORE turning off
the electrical supply. (See Fig.
9.) Failure to follow this warn-
ing could result in a fire or ex-
plosion, and personal injury/
death or property damage.
!
®
C
L
O
S
E
10
2. Close the external manual gas
valve. (See Fig. 9.)
3. Turn OFF electrical supply to the
furnace. (See Fig. 10.)
4. Remove main furnace door. (See
Fig. 11.)
5. The gas valve will have a control
switch to turn OFF or ON. Turn
control switch on the gas control to
the OFF position and wait 5 min-
utes. (See Fig. 12 or 13.) Then
smell for gas, including near the
floor. If you smell gas,
STOP!
Fol-
low “B” on furnace label. If you
don’t smell gas, go to next step.
6. After waiting 5 minutes, turn con-
trol switch on the gas valve to the
ON position. (See Fig. 14 or 15.)
7. Replace main furnace door.
(See Fig. 16.)
11
12
For 352MAV and 355MAV
13
14
15
8. Turn ON electrical supply to the
furnace and wait 1 minute.
(See Fig. 17.)
9. Open the external manual gas
valve. (See Fig. 18.)
10. Set room thermostat to a tempera-
ture slightly above room tempera-
ture. This will automatically
signal the furnace to start.
11. When the furnace receives the
start signal, the inducer is started.
When the pressure switch senses
that there is sufficient combustion
air, the hot surface igniter is ener-
gized. After the hot surface igniter
is heated for 17 seconds, the gas
valve permits gas to flow to the
main burners. After ignition and a
time delay of about 60 sec, the fur-
nace blower will start. Variable-
capacity furnaces start at low
speed until the control makes the
ON
OFF
OR
For 340MAV and 350MAV
or
For 352MAV and 355MAV
ON
OFF
For 340MAV and 350MAV
or