To light the pilot, it is important that the electrode be 1/8” (3mm) from the thermocouple. The spark must occur at the point the burner flame hits the thermocouple. The end of the electrode will be red hot with the pilot on.
On a new installation with air in the gas line, it is suggested that a match be used. The match will light the pilot faster than the piezo under this condition.
Proper Pilot Flame
The correct pilot flame (Figure 6) will be blue, extending past the thermo- couple. The flame will surround the thermocouple just below 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. Re- place pilot cover screw to eliminate gas leakage.
LP gas (propane) 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
Figure 6
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
To clean burner port disconnect the gas supply to the valve, and remove the eight screws fastening the burner door. After removing 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
6” (152mm) ANDLP
1 1/2” (38mm) NAT
1/4” (6mm) LP
If fan motor is replaced, the silicone rubber gaskets, see Page 10, In- dex No. 5, Part 712059, 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.
Wiring
The appliance, when installed, must be electrically grounded in accor- dance 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
Thermostat Installation
The thermostat should be installed in the same room as the furnace 4’ (1.2m) to 5’ (1.5m) above the floor and away from another heat source (cooking stove, hot water heater, etc.) including walls and doorways with a heat source in an adjoining room. Do Not Install Thermostat on Out-
side Wall.
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 venting and cause the wall furnace to shut “OFF” by the vent safety switch. To prevent de- layed 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 combusti- bles.
10’(3m) OR
LESS
3’ (.9m) MIN
2’ (.6m) MIN
Figure 7
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 surrounding 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.
Figure 8
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