Lighting And Adjustment Of The Appliance - Nordyne M2RC-080 Installation Instructions Manual

Reinstallingthe Burner Assembly:
1. Reinstall the gas manifold assembly to
the burner box with the four (4) fasteners,
which were removed earlier.
2. Carefully reinstall the burner box into the
unit. After installing the burner, inspect
the alignment of the burners with the heat
exchanger tubes. The center of the burn-
ers should be aligned with the center of
the tubes.
3. Reconnect the gas piping to the gas
valve.
4. Reconnect the wires to the gas valve
terminals.
5. Reconnect the rubber pressure tubes to
the gas valve and the burner box. Rein-
stall the burner access cover plate.
6. Reconnect the igniter at the 2 position
plug.
7. Reconnect the flame sensor wire to the
burner box.
Pressure Gauge Installation
NOTE: For natural gas installations, the in-
coming 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 be-
tween 11 .O" 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 supplied instructions.
LIGHTING AND ADJUSTMENT OF
THE APPLIANCE
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.
.
7.
Check that the unit ignites and operates
properly. Refer to the installation instruc-
tions provided with your unit for the nor-
mal operating sequence.
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 assembly, the flame color should
be blue with some light yellow streaks
near the outer portions of the flame.
NOTE: Until all of the air is bled out of the gas
line, the hot surface igniter 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 igniter 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.
Adjusting the Manifold Pressure
The manifold pressure can be measured by
installing a pressure gauge or U-tube ma-
nometer to the outlet end of the gas valve as
follows:
1. With a 3/16" Allen wrench, remove the
manifold pressure tap plug located on the
outlet side of the gas valve. Refer to
Figure 3 for more details.
2. A fitting, which has a 1/8" NPT pipe thread
that is compatible with the pressure gauge
or U-tube manometer, must be installed ............
at this point.
3. Install the pressure gauge or U-tube ma-
nometer according to the manufacturer's
supplied instructions.
4. Set the room thermostat to a point above
room temperature to start the furnace.
5. Allow the furnace to operate for three (3)
minutes and then check the manifold
6.
pressure.
Table 10 lists the appropriate manifold
pressures for both natural gas and pro-
pane (LP) gas installations, For the type
of fuel and the altitude of your installation,
23