7
9. Open external manual gas valve. (See Fig. 15.)
10. Set the room thermostat to a temperature slightly above room temperature. (See Fig. 16.) This will automatically signal the
furnace to start.
14
15
16
11. When the furnace receives the start signal, the hot surface igniter at the main burners is automatically heated for 15 to 20 sec. When
the microprocessor control veri
fi
es that there is suf
fi
cient heat to ignite, the gas valve permits gas to
fl
ow to the main burners. After
ignition and a time delay of approximately 60 sec, the furnace blower starts.
NOTE:
If the burners fail to ignite after 4 attempts, the furnace control system will lock out. If lockout occurs, the main burners fail
to light, or blower does not come on, shut down the furnace and call your dealer for service.
12. Set your thermostat to the temperature that satis
fi
es your comfort requirements.
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. 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 continuously. Continuous fan keeps the temperature level in your
home more evenly balanced. It also permits the indoor air to be continuously
fi
ltered.
SHUTTING DOWN YOUR FURNACE
Should you need to shut down your furnace for service or maintenance, you will need to turn the furnace off.
17
18
19
The following procedures must be followed:
1. Set your room thermostat to the lowest temperature setting. (See Fig. 17.)
2. Close the external manual gas valve. (See Fig. 18.)
3. Turn off electrical supply to the furnace. (See Fig. 19.)
4.
Remove main furnace door. (See Fig. 10.)
5. Turn control switch on the gas control to OFF position. (See Fig. 20.)
20
OP
E
N
<
<
<
<
CL
O
S
E
ON
O
F
F
M
P
C
1
3
2
