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Proper Pilot Flame
The correct pilot flame (Figure 6) will be blue, extending past the
thermocouple. The flame will surround the thermocouple just be-
low the tip.
Natural Gas pilots require adjusting when the inlet gas pressure
is above 5" w.c. (1.245kPa). Remove the pilot cover screw on the
control valve (Figure 5), and turn the adjustment screw clockwise
to reduce flame. Replace pilot cover screw to eliminate gas leak-
age.
Propane Gas will not require adjustment.
After use, cleaning may be required for the proper flame.
PROPER FLAME ADJUSTMENT
DO MAKE A PERIODIC VISUAL
CHECK OF PILOT & BURNERS
Proper Main Burner Flame
The correct flame will be a short blue inner flame with a much
larger light blue outer flame. The main burner (Figure 7) shows
the approximate height of each part of the flame for each gas. The
burner does not have a primary air adjustment. The flame will be
correct if the factory-set pressure and orifice opening are used.
After the furnace has been operating, the burner ports may be
blocked by foreign matter carried in by combustion air. Therefore,
cleaning of the burner may be needed for proper flame.
To clean burner port disconnect the gas supply to the valve, and
remove the eight screws fastening the burner door. After remov-
ing the burner door from the combustion chamber, remove rear
burner, pilot burner and front burner. With front and rear burners
removed from furnace, force water into the ribbon ports and dry
with air pressure.
4" (102mm)
NAT
AND
6" (152mm)
LP
1 1/2" (38mm)
NAT
1/4" (6mm)
LP
Replacing Fan and Oiling the Motor
The fan motor should be cleaned and oiled once each heating
season. To reach the motor, withdraw the metal shroud surround-
ing the fan blade by removing the screws on each side. Oil holes
are located on the top at each end of the motor. Use a few drops
of #10 motor oil. To clean the motor, blow air through its ventilation
openings with a vacuum cleaner or low pressure air source.
If fan motor is replaced, the silicone rubber gaskets, see page 12,
Index No. 5, Part M147, should also be replaced. The gaskets
must be stretched to fit the motor bolts into the gasket holes and
then the motor and gaskets installed on the motor mounting bars.
Page 8
Figure 6
Figure 7
Wiring
The appliance, when installed, must be electrically grounded in
accordance with local codes or, in the absence of local codes with
the National Electrical Code, ANSI/NFPA70 or Canadian Electrical
Code CSA C22.1, if an external electrical source is utilized. This
appliance is equipped with a three-prong (grounding) plug for
your protection against shock hazard and should be plugged
directly into a properly grounded three-prong receptacle. Do
not cut or remove the grounding prong from this plug. For an
ungrounded receptacle, an adapter, which has two prongs and a
wire for grounding, can be purchased, plugged into the unground-
ed receptacle and its wire connected to the receptacle mounting
screw. With this wire completing the ground, the appliance cord
plug can be plugged into the adapter and be electrically grounded.
A 7/8" (22mm) hole is provided in the junction box for use with a
conduit connector if local codes require this type of protection.
Installing the ON/OFF Device
To install an ON/OFF device (such as a wall switch, remote, toggle
switch, or thermostat), remove the wire nut from the two wires
from the valve. Run additional wire from the valve wires to the ON/
OFF device. Install the ON/OFF device in the same room as the
furnace following the installation instructions supplied with it. In
the absence of instructions, install the ON/OFF device 4 to 5 feet
above the floor on an interior wall not affected by another heating
source (i.e. stove or water heater) or the temperature of an adjoin-
ing room.
To Conserve Gas: Turn off pilot when heater is not in use.
Insulated Vent Enclosure
Vented wall furnaces installed in buildings with flat roofs can have
poor venting. The cold vent pipe will have a delay in proper vent-
ing and cause the wall furnace to shut "OFF" by the vent safety
switch. To prevent delayed venting as well as condensation of flue
products an insulated vent enclosure is recommended.
Use type B vent pipe and maintain at least one inch (25mm)
clearance to combustibles.
Use metal thimble to protect vent pipe as it passes through
combustibles.
10'(3m) OR
LESS
3' (.9m) MIN
2' (.6m) MIN
Figure 8
37406-5-0320
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