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installed without a cooling coil, it is recommended that a remov-
able access panel be provided in the outlet air duct. This opening
shall be accessible when the furnace is installed and shall be of
such a size that the heat exchanger can be viewed for visual light
inspection or such that a sampling probe can be inserted into the
air stream. The access panel must be made to prevent air leaks
when the furnace is in operation. When the furnace is heating, the
temperature of the return air entering the furnace must be between
55°F and 100°F.
FILTERS - READ THIS SECTION BEFORE INSTALLING THE
RETURN AIR D UCTWORK
Filters must be used with this furnace. Discuss filter maintenance
with the building owner. Filters do not ship with this furnace, but
must be provided by the installer. Filters must comply with UL900
or CAN/ULCS111 standards. If the furnace is installed without fil-
ters, the warranty will be voided.
On upflow units, guide dimples locate the side return cutout
locations. Use a straight edge to scribe lines connecting the
dimples. Cut out the opening on these lines.
NOTE: An undersized opening will cause reduced airflow.
Refer to Minimum Filter Area tables to determine filter area re-
quirements.
600 800 1000 1200 1400 1600 2000
040_3BXA
0453BXA
194* 194* 240 288 --- --- ---
060_3BXA
0703BXA
--- 324* 324* 324* 336 --- ---
0704CXA --- --- 291* 291* 336 384 ---
0904CXA --- --- 432* 432* 432* 432* ---
080_5CXA
0905DXA
--- --- --- 388* 388* 388* 480
100_5DXA
1155DXA
--- --- --- 486* 486* 486* 486*
Input__Airflow
COOLING AIRFLOW REQUIREMENT (CFM)
*Minimum filter area dictated by heating airflow requirement.
Permanent Minimum Filter Area (sq. in)
[Based on a 600 ft/min filter face velocity]
600 800 1000 1200 1400 1600 2000
040_3BXA
0453BXA
388* 388* 480 576 --- --- ---
060_3BXA
0703BXA
--- 647* 647* 647* 672 --- ---
0704CXA 583* 583* 672 768
0904CXA --- --- 863* 863* 863* 863* ---
080_5CXA
0905DXA
--- --- --- 777* 777* 777* 960
100_5DXA
1155DXA
--- --- --- 971* 971* 971* 971*
Input__Airflow
COOLING AIRFLOW REQUIREMENT (CFM)
*Minimum filter area dictated by heating airflow requirement.
Disposable Minimum Filter area (sq. in)
[Based on 300 ft/min filter face velocity]
UPRIGHT I NSTALLATIONS
Depending on the installation and/or customer preference, differ-
ing filter arrangements can be applied. Filters can be installed in
the central return register or a side panel external filter rack kit
(upflows). As an alternative a media air filter or electronic air cleaner
can be used as the requested filter.
The following figure shows possible filter locations.
FILTER
AIR FLOW
CENTRAL
RETURN
GRILLE
FILTER
SIDE RETURN
EXTERNAL FILTER
RACK KIT
(EITHER SIDE)
FILTER
FILTER
AIR FLOW
FILTER
ACCESS
DOOR
CENTRAL
RETURN
GRILLE
RETURN
DUCT
FILTER
FILTER
SUPPORT
BRACKET
(PROVIDED)
Possible Upright Upflow Possible Upright Counterflow
Filter Locations
NOTE: Internal filter retention is not provided on this furnace. If an
internal installation is desired, an internal filter retention kit is avail-
able as an accessory. Please see your distributor for details.
HORIZONTAL I NSTALLATIONS
Filters must be installed in either the central return register or in the
return air duct work.
XIV. STARTUP PROCEDURE & ADJUSTMENT
Furnace must have a 115 VAC power supply properly connected
and grounded. Proper polarity must be maintained for correct op-
eration. In addition to the following start-up and adjustment items,
refer to further information in Section XVI, Operational Checks.
HEAT ANTICIPATOR S ETTING
The heat anticipator in the room thermostat must be correctly ad-
justed to obtain the proper number of cycles per hour and to pre-
vent “overshooting” of the setting. Set the heat anticipator setting to
0.7 amps. Follow the thermostat manufacturer’s instructions on
how to adjust the heat anticipator setting.
DRAIN TRAP PRIMING
The drain trap must be primed prior to furnace startup. To prime, fill
the drain trap with water. This ensures proper furnace drainage
upon startup and prohibits the possibility of flue gases escaping
through the drain system.
FURNACE OPERATION
Purge gas lines of air prior to startup. Be sure not to purge lines
into an enclosed burner compartment.
Check for leaks using an approved chloride-free soap and water
solution, an electronic combustible gas detector, or other approved
method. Verify that all required kits (propane gas, high altitude,
etc.) have been appropriately installed.
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.
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