Bryant 345MAV, User'S Information Manual

5

Wait 5 minutes to clear out any 
gas. Then smell for gas, including near 
the floor. If you smell gas,

 STOP! 

 Fol-

low “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 the inside of main furnace 
door, or in the “Shutting Down Your 
Furnace” 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 low-

est temperature setting. (See Fig. 6.)

6

7

WARNING

If overheating occurs or the
gas valve fails to shut off the
gas supply, turn off the man-
ual gas valve to the furnace
BEFORE turning off the elec-
trical supply. (See Fig. 7.) Fail-
ure to follow this warning
could result in a fire or explo-
sion, and personal injury/
death or property damage.

!

®

CL

O

S

E

8

2. Close the external manual gas 

valve. (See Fig. 7.)

3. Turn OFF electrical supply to the 

furnace. (See Fig. 8.)

4. Remove the main furnace door. 

(See Fig. 9.)

5. 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. 10.) Then smell for 
gas, including near the floor. If you 
smell gas, 

STOP! 

Follow operating 

instructions on main furnace door.

6. After waiting 5 minutes, turn con-

trol switch on the gas control to the 
ON position. (See Fig. 11.)

7. Replace main furnace door. 

(See Fig. 12.)

8. Turn ON electrical supply to the 

furnace and wait 1 minute. 
(See Fig. 13.)

9. Open the external manual gas 

valve. (See Fig. 14.)

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 ignitor is energized. 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 
approximately 60 sec, the furnace 
blower starts.

9

10

NOTE: 

If the burners fail to ignite after 

4 attempts, the furnace control system 
will lock out. If lockout occurs, main 
burners fail to light, or blower does not 
come on, shut down the furnace and 
call your dealer for service.

11

12. Set your thermostat to the temper-

ature that satisfies your comfort 
requirements. 

SUGGESTION: Setting the ther-
mostat back a few degrees and 
compensating for the difference 
with warmer clothing can make a 
big difference in your fuel con-
sumption.  The few degrees at the 
top of your thermostat “comfort 
level” are the most costly degrees to 
obtain.

When room temperature drops 
below the temperature selected 
on the thermostat, the furnace 
will be switched on automatically. 
When room temperature reaches 
the temperature selected on the 
thermostat, the furnace will be 
switched off automatically.

Some thermostats have a FAN 
mode with 2 selections, AUTO 
and ON. When thermostat is set 
to AUTO, the furnace blower 
cycles on and off. In ON mode, the 
furnace blower runs continu-
ously. Continuous fan keeps the 
temperature level in your home 
more evenly balanced. It also per-
mits the indoor air to be continu-
ously filtered.