Pressure Gauge Installation
NOTE: For natural gas installations, the incom-
ing gas line pressure at the gas valve inlet must
be between 4.5" WC and 10.0" WC. For LP gas
installations, the incoming gas line pressure at
the gas valve inlet must be between 11.0" WC
and 14.0" WC. This pressure can be checked
at the inlet end of the gas valve using a pressure
gauge or U-tube manometer, which must be
installed according to the manufacturer's sup-
plied instructions.
LIGHTING AND ADJUSTMENT OF
THEAPPLIANCE
1. Turn ON the gas at the manual valve,
outside of the unit.
2. Check all gas connections for leaks with
a soap and water solution. If the solution
bubbles there is a gas leak which must be
corrected. Do NOT use an open flame to
check for gas leaks.
3. Turn ON the electrical power to the appli-
ance.
4. Move the gas valve lever/knob to the "ON"
position. The lever/knob must be moved
to the end of its range of motion to insure
the valve is completely open. Use only
your hand to push in or turn the gas control
valve. Never use tools.
5. Set the room thermostat to a point above
room temperature to begin the heating
cycle of the unit.
6. Check that the unit ignites and operates
properly. Refer to the installation instruc-
tions provided with your unit for the normal
operating sequence.
7. After the flame ignites, visually inspect the
burner assembly to ensure that the flame
is drawn directly into the center of the heat
exchanger tube, as shown in Figure 23.
The end of the flame will be out of sight
around the bend of the heat exchanger
tube. In a properly adjusted burner assem-
bly, the flame color should be blue with
some light yellow streaks near the outer
portions of the flame.
Type of Fuel Manifold Pressure
in. WC
Natural Gas: 3.5
Propane (LP) Gas: 10.0
Table 7. Manifold Pressure
NOTE: Until all of the air is bled out of the gas
line, the hot surface ignitor may not ignite the
gas. If the ignition control locks out, turn the
thermostat to its lowest setting and wait one
minute then turn the thermostat to a point above
room temperature and the ignitor will try again
to ignite the main burners. This process may
have to be repeated several times before the
burners will ignite. Once the burners are lit,
check all gas connections for leaks again with
the soap and water solution. If the solution
bubbles there is a gas leak which must be
corrected. Do not use an open flame to check
for gas leaks.
Manifold Pressure
The gas valve for the M3 furnace series is
equipped with a special conversion pres-
sure regulator cap. The pressure regulator
cap is factory set. if the gas valve is con-
verted from natural gas to propane gas or
vise versa, the manifold pressure of the gas
valve will be set to pressure listed in Table 7.
COMPLETING THE CONVERSION
1. Affix the gas valve conversion label found
in the package with the orifices to the unit
rating plate.
2. Run the appliance through a complete
cycle to assure proper operation.
CAUTION:
To avoid electric shock, personal
injury, or death, turn off the power at
the disconnect or the main service
panel before making any electrical
connections,
ELECTRICAL WIRING
General
Electrical connections must be made in accor-
dance with all applicable local codes and ordi-
nances, and with the current revision of the
National Electric Code (ANSI/NFPA 70).
For Canadian installations electrical connec-
tions and grounding must be done in accor-
dance with the current Canadian Electrical
Code (CSA C22.1 Part 1) and/or local codes. If
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