26
Figure 31 shows possible filter locations.
FILTER
AIR FLOW
CENTRAL
RETURN
GRILLE
FILTER
SIDE RETURN
EXTERNAL FILTER
RACK KIT
(EITHER SIDE)
Possible Upright Upflow
Figure 31
HORIZONTAL INSTALLATIONS
Filters must be installed in either the central return register
or in the return air duct work.
STARTUP PROCEDURE & ADJUSTMENT
Furnace must have a 115 VAC power supply properly connected
and grounded. Proper polarity must be maintained for correct
operation. In addition to the following start-up and adjust-
ment items, refer to further information in Operational Checks
section.
DRAIN TRAP PRIMING
The drain trap MUST be primed prior to furnace startup. To
prime, fill both sides of the drain trap with water. This
ensures proper furnace drainage upon startup and prohibits
the possibility of flue gases escaping through the drain sys-
tem.
FURNACE OPERATION
Purge gas lines of air prior to startup. Be sure not purge lines
into an enclosed burner compartment.
Check for leaks using an approved chloride-free soap and wa-
ter solution, an electronic combustible gas detector, or other
approved method.
CAUTION
T
O
PREVENT
UNRELIABLE
OPERATION
OR
EQUIPMENT
DAMAGE
,
THE
INLET
GAS
SUPPLY
PRESSURE
MUST
BE
AS
SPECIFIED
ON
THE
UNIT
RATING
PLATE
WITH
ALL
OTHER
HOUSEHOLD
GAS
FIRED
APPLIANCES
OPERATING
.
FURNACE STARTUP
1. Close the manual gas shutoff valve external to the
furnace.
2. Turn off the electrical power to the furnace.
3. Set the room thermostat to the lowest possible setting.
4. Remove the burner compartment door.
NOTE: This furnace is equipped with an ignition device
which automatically lights the burner. Do not try to light
the burner by hand.
5. Move the furnace gas valve manual control to the OFF
position.
6. Wait five minutes then smell for gas. Be sure check
near the floor as some types of gas are heavier than
air.
7. If you smell gas after five minutes, immediately follow
the Safety Considerations section of this manual. If
you do not smell gas after five minutes, move the
furnace gas valve manual control to the ON position.
8. Replace the burner compartment door.
9. Open the manual gas shutoff valve external to the furnace.
10. Turn on the electrical power to the furnace.
11.Adjust the thermostat to a setting above room
temperature.
12. After the burners are lit, set the thermostat to desired
temperature.
CAUTION
T
O
PREVENT
UNRELIABLE
OPERATION
OR
EQUIPMENT
DAMAGE
,
THE
INLET
GAS
SUPPLY
PRESSURE
MUST
BE
AS
SPECIFIED
ON
THE
UNIT
RATING
PLATE
WITH
ALL
OTHER
HOUSEHOLD
GAS
FIRED
APPLIANCES
OPERATING
.
FURNACE SHUTDOWN
1. Set the thermostat to the lowest setting.
The integrated control will close the gas valve and
extinguish flame. Following a 15 second delay, the induced
draft blower will be de-energized. The indoor blower
will shut down when the time delay expires.
2. Remove the burner compartment door and move the
furnace gas valve manual control to the OFF position.
3. Close the manual gas shutoff valve external to the furnace.
4. Replace the burner compartment door.
GAS SUPPLY PRESSURE MEASUREMENT
GAS PRESSURE TEST
The line pressure supplied to the gas valve must be within the
range specified below. The supply pressure can be measured at
the gas valve inlet pressure tap or at a hose fitting installed in
the gas piping drip leg. The supply pressure must be measured
with the burners operating. To measure the gas supply pressure,
use the following procedure.
1. Turn OFF gas to furnace at the manual gas shutoff valve
external to the furnace.
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