AdjustPilot Burner
The furnace has a pilot flame to light the main burner. The flame
should surround 3/8" to 1/2" of the flame rod. See Figure 24. To
adjust, remove cap from pilot adjusting screw on gas valve. Turn
screw counterclockwise to increase or clockwise to decrease
flame as required. Replace cap after adjusting screw.
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Proper flame
adjustment
Pilot Burner
3/8to 1/2"
Igniter-sensor
I 10-12-12c
ChangingBlowerSpeed
Electrical shock hazard.
Turn OFF power to furnace before changing speed taps.
Failure to do so can result in death, personal injury
and/or property damage.
NOTE: The speed taps that the manufacture sets from the factory
for this product are based on a nominal 400 CFM per ton cooling
and the basic mid range on the temperature rise for heating.
Since the manufacturer cannot establish the static pressure
that will be applied to the unit, it is the responsibility of the
installer deal er/contractor to select the proper speed taps for
the application when the unit is installed.
If it is necessary to change speeds, refer to steps below.
1. Refer to Furnace Wiring Diagram for location of the heating
and cooling speed taps located on the electronic fan control
as well as location of unused blower motor speed leads. Use
the chart (Table 7) to determine the blower motor speed set-
tings.
Main BurnerFlameCheck
Allow the furnace to run approximately 10 minutes then inspect
the main burner and pilot flames. See Figure 25.
Check for the fol!owing (Figure 25):
• Stable and blue flames. Dust may cause orange tips or
wisps of yellow, but flames MUST NOT have solid, yellow
tips.
• Flames extending directly from burner into heat exchanger.
• Flames do NOT touch sides of heat exchanger
If any problems with main burner flames are noted, it may be nec-
essary to adjust gas pressures, or check for drafts.
Main Burner
10-10-78
TemperatureRiseCheck
The blower speed MUST be set to give the correct air temperature
rise through the furnace as marked on the rating plate. Tempera-
ture rise is the difference between supply and return air tempera-
tures.
IN
Blower Speed Chart
Wire Color
Black
Orange*
Blue
Red
Motor Speed
High
Med-High
Medium
low
* Med-High speed may not be provided on all models.
Change the heat or cool blower motor speed by removing the
motor lead from the "Heat" or "Cool" terminal and replace it
with the desired motor speed lead from the "Unused Motor
Lead" location. Connect the wire previously removed from
the "Heat" or "Cool" terminal to the vacated "Unused Motor
Lead" terminal.
If the same speed must be used for both heating and cooling,
remove the undesired motor speed lead from the "Heat" or
"Cooi"terminal and connect that lead to the open terminal at
"Unused Motor Lead" location or tape off. Attach a jumper
between the "Heat" and "Cool" terminals and the remaining
motor speed lead.
Note: When using the same speed on motors with (4) speed
leads, it will be necessary to tape off the terminal of the motor
speed lead removed from the "Heat" or "Cool" terminal with
electrical tape since an open terminal wi!! not be available at
the "Unused Motor Lead" location.
ContinuousFanOperation
A terminal is provided on the electronic fan control located in the
circulating blower compartment for operation of the continuous
fan option. This connection is intended for the low speed motor
tap, and has a lower contact rating (8 amps) than the heat and
cool taps. When the low speed blower lead is connected to this
terminal, this will provide low speed blower operation whenever
the other two speeds (Heat or Cool) are not energized.
Thoroughly check the system after modification to ensure the
proper operation of the circulating air blower in all modes of opera-
tion.
441 012603 02
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