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Check the Furnace Input Rate
(if required)
IMPORTANT:
The furnace input rate must not exceed the input rating on
the furnace rating plate.
This furnace is equipped for rated input at manifold pressures
of 3.5 in. W.C. for natural gas and 11.0 in. W.C. for propane
gas.
At altitudes above 2,000 ft the furnace input rate must not
exceed that on the unit rating plate reduced by 4 percent for
each 1,000 ft above sea level.
1. For natural gas, check the furnace rate by observing the gas
meter, making sure all other gas appliances are turned off.
The test hand on the meter should be timed for at least one
revolution.
BTU/HR
= Cubic feet per Revolution x 3600 x Heating
INPUT
# Seconds per Revolution
2. The actual heating value of your gas can be obtained from
your local utility company.
Check Manifold Pressure
1. Remove the burner access panel.
2. Move the gas control knob to the OFF position. Use only your
hand to move the gas control knob; tools are not required.
3. Remove the outlet pressure tap plug on the gas control valve
and connect pressure gauge to the ¹⁄₈ in. NPT outlet pressure
tap.
4. Be sure the gas control knob has been in the OFF position for
at least 5 minutes before starting the unit.
5. Move the gas control knob to the ON position.
NOTE: This furnace is equipped with an ignition device,
which automatically lights the burner. This furnace cannot be
lighted manually. Do not try to light the burner by hand.
6. Turn on the electrical power to the furnace.
7. Set the room thermostat to a point above room temperature
to light the main burners.
8. Observe the pressure reading on the pressure gauge.
9. Refer to the rating plate for the correct manifold pressure. If
necessary, remove the regulator adjusting cap on the gas
valve and turn the regulator adjusting screw clockwise to
increase pressure, or counterclockwise to decrease pressure.
IMPORTANT: If the manifold pressure cannot be adjusted to
the value on the unit rating plate, contact your gas supplier.
10. Move the gas control knob to the OFF position.
11. Disconnect the pressure gauge from the ¹⁄₈ in. NPT outlet
pressure tap.
12. Replace outlet pressure tap plug and the regulator adjusting
cap on the gas valve.
13. Move the gas control knob to the ON position.
14. Replace the burner access panel.
15. Set the room thermostat to the desired temperature.
Complete Installation
IMPORTANT: Do not use this furnace if any part has been under
water. Immediately call a qualified person to inspect the unit and
to replace any part of the control system and gas control which
has been under water.
1. Check to be sure you have all of your tools.
2. Dispose of all packaging materials.
3. Check the furnace in its final location. Be sure the exhaust
vent is not blocked.
Measure Temperature Rise
1. After 20 minutes of heating operation, measure the furnace
temperature rise. Take air temperature readings in both the
return air ducts and the heated air ducts.
NOTE: If more than one run of return or heated air ducts is
used, air temperature measurements should be taken in each
duct. These measurements can be converted to an average
to obtain the temperature rise of the whole system.
2. If the furnace doesn't maintain temperature rise within the
range shown on the furnace rating plate, adjust the blower
speed.
Adjust Blower Speed
Value
Disconnect power before servicing.
Replace all parts and panels before operating.
Failure to do so can result in death or electrical shock.
NOTE: See the "Wiring Connection Diagram" while performing
the following procedure.
Blower Speed Tap Change
To Select the Same Speed for COOL and HEAT
At the Blower Motor Connector
1. Disconnect power.
2. Remove blower access panel.
WARNING
Electrical Shock Hazard
1
Red
LOW
Blue
MED
White
HIGH
COM
Red
UNUSED
Violet
HEAT
Blue
COOL
1. Blower motor connector
2. Control board
3. Jumper wire
2
3
11
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