START-UP
For Your Safety Read Before Lighting
Pre-Start Check List
Complete the following checks before starting the unit:
1. Check the type of gas being supplied. Be sure it isthe
same as listed on the unit nameplate.
2. Make sure that the vent hood has been properly installed.
To Light Burners:
1. Turn off electrical power to unit.
2. Turn the thermostat to lowest setting.
3. Turn the gas control knob, or slide the gas control
switch, to the "ON" position (see Figure 9).
4. Turn on electrical power to the unit.
5. Set the room thermostat to the desired temperature.
(If the thermostat "set" temperature is above room
temperature, the burners will light after the pre-purge
time expires.)
To Shut Down Burners:
1. Turn off electrical power to unit.
2. Turn the gas control knob, or slide the gas control
switch, to the "OFF" position (see Figure 9).
Post-Start Check List
After the entire control circuit has been energized and the
heating section is operating, make the following checks:
1. Check for gas leaks, using soapy solution, in the unit
piping as well as the supply piping.
2. Check for correct manifold gas pressures (see following
Checking and Adjusting Gas input section).
3. Check the supply gas pressure. It must be within the
limits shown on the rating plate. Supply pressure
should be checked with all gas appliances in the
building at full fire. At no time should the supply
pressure during standby exceed 13" W.C., nor should
it be less than 5" W.C. for natural gas or 11"W.C. for
Page 10
Gas Valves
Regulator Gas
Adjustment Control
Cap Knob
Inlet Pressure Tap Outlet Pressure Tap
1/8" NPT (Manifold Pressure)
1/8" NPT
Regulator
Adjustment Gas Control Switch
Inlet Pressure Tap
1/8" NPT
Outlet Pressure Tap
(Manifold Pressure)
1/8" NPT
Figure 9
propane gas with the burners in operation. If gas
pressure is outside these limits, contact the gas
supplier for corrective action.
4. Adjust temperature rise to be within the range speci-
fied on the rating plate.
Checking and Adjusting Gas input
For purpose of input adjustment, the minimum permis-
sible gas supply pressure is 5" W.C. for natural gas and
11" W.C. for propane.
Gas input must never exceed the input capacity shown on
the rating plate. The furnace is equipped for natural gas
rated inputs with manifold pressure of 3.5" W.C.
The manifold pressure can be measured by shutting off the
gas, removing the pipe plug inthe downstream side of the
gas valve, and connecting a water manometer or gauge. To
adjust the regulator, turn the adjusting screw on the regula-
tor clockwise to increase pressure and inputor counter-
clockwise to decrease pressure and input.The final
manifold pressure should not vary more than 0.3" W.C.
from the above specified pressure. See Figure 9 to assist
in locating the regulator on the gas valve.
# 48111B005
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