19
6. The manifold pressure must be set to the appropriate
value for each installation by a qualifi ed installer,
service agency or the gas supplier.
WARNING:
Do not attempt to drill the gas orifi ces. Use
only factory supplied orifices. Improperly
drilled orifi ces may cause fi re, explosion,
carbon monoxide poisoning, personal injury
or death.
a.) Obtain the manifold pressure setting required for
this installation by referring to Table 8 for Propane
or Tables 10 or 11 for Natural Gas (pages 32-33).
b.) Remove the regulator capscrew (Figure 14) from
the INLET side of the regulator.
c.) Slowly turn the adjustment screw inside the regulator
to obtain the appropriate manifold pressure.
NOTE: Turning the screw clockwise increases
the pressure and turning the screw counter-
clockwise decreases the pressure. To prevent
backing the screw all the way out from the valve,
turn the screw slowly.
d.) Replace and tighten the regulator capscrew over
the adjustment screw.
Verifying and Adjusting Temperature Rise
Confi rm the temperature rise through the furnace is
within the limits specifi ed on the furnace rating plate. Any
temperature rise outside the specifi ed limits could result
in premature failure of the heat exchanger.
WARNING:
To prevent electric shock, personal injury, or
death, disconnect the electric power before
performing any maintenance.
1. Place thermometers in the return and supply air stream
as close to the furnace as possible. The thermometer
on the supply air side must be shielded from direct
radiation from the heat exchanger to avoid false
readings.
2. Adjust all registers and duct dampers to the desired
position and run the furnace for 10 to 15 minutes before
taking any temperature readings. The temperature
rise is the difference between the supply and return
air temperatures.
For typical duct systems, the temperature rise will fall
within the limits specifi ed on the rating plate with the
blower speed at the factory recommended setting. If the
measured temperature rise is outside the specifi ed limits,
it may be necessary to change the speed of the blower.
NOTE:
Lowering the blower speed will increase the
temperature rise and a higher blower speed will decrease
the temperature rise.
The furnace is equipped with a multi-speed motor. Heating,
cooling, and fan speed selection is made by moving the
switch on the integrated control located in the furnace.
Verifying Burner Operation
CAUTION:
The door over the burners may only be open
for inspection purposes only. The door must be
installed during unattended operation.
1. Remove the burner compartment door.
2. Set the thermostat above room temperature and observe
the ignition sequence.
NOTE:
The burner fl ame should
carry over immediately between all burners without
lifting off, curling, or fl oating. The fl ames should be blue,
without yellow tips.
3. After validating the fl ame, change the thermostat setting
to below room temperature.
4. Verify the burner fl ame is completely extinguished.
5. Replace the burner compartment door.
Capscrew
Figure 14. Regulator Capscrew
Example
:
• Time for 1 revolution of a gas meter with a 1
cubic ft dial = 40 seconds.
• From Table 6 read 90 cubic ft gas per hr.
• Local heating value of the gas (obtained from
gas supplier) = 1,040 Btu per cubic ft.
• Input rate = 1,040 x 90 = 93,600 Btuh.
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