Empire Products FAW-55IP Checking Manifold Pressure, High Altitudes, Proper Pilot Flame

INSTALLATION

Checking Manifold Pressure

Both Propane and Natural gas valves have a built-in pressure regulator in the gas valve. Natural gas models will have a manifold pressure of approximately 3.5” w.c. (.871kPa) at the valve outlet with the inlet pressure to the valve from a minimum of 5.0” w.c. (1.24kPa) for the purpose of input adjustment to a maximum of 10.5” w.c. (2.615kPa) Propane gas models will have a manifold pressure approximately 10.0” w.c. (2.49kPa) at the valve outlet with the inlet pressure to the valve from a minimum of 11.0” w.c. (2.739kPa) for the purpose of input adjustment to a maximum of 13.0” w.c. (3.237kPa).

A 1/8” (3mm) N.P.T. plugged tapping, accessible for test gauge connection, is located on the outlet side of the gas control.

The built-in regulator comes on at approximately 1/4th pressure and full on in 10 seconds.

Figure 5

High Altitudes

For altitudes/elevations above 2,000 feet (610m), input ratings should be reduced at the rate of 4 percent for each 1,000 feet (305m) above sea level. Canadian High Altitudes for locations having an elevation above mean sea level between 2,000 feet (610m) and 4,500 feet (1370m), the manifold pressure is to be decreased from 3.5” w.c. (.871kPa) to 2.8” w.c. (.697kPa) for Natural Gas and from 10.0” w.c. (2.49kPa) to 8.0” w.c. (1.992kPa) for Propane Gas.

Proper Pilot Flame

The pilot flame (Figure 6) going to the spark must be large enough to completely cover the sparking area. With the proper flame, only 2 or 3 sparks will occur. More sparks indicate a small pilot flame and no ignition with spark stopping after approximately 90 seconds generally means not enough flame.

To adjust pilot flame 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 leakage.

The pilot flame will appear large. A blue nearly horizontal flame is proper. The spark gap must be 1/8” (3mm) . A larger gap can result in the spark occurring some other place. The pilot flame and the spark gap are factory checked and tested.

After use, cleaning may be required for the proper flame.

Safety Lockout

S8600H module provides 100 percent shutoff, orsafety lockout. If the pilot fails to light within 90 seconds, the control system will shut down. The control system must be reset by setting the thermostat below room temperature for one minute or by turning off power to the module for one minute.

Figure 6

Electrode and pilot must be kept clean. Clean through pilot access hole with a small brush (toothbrush) and water.

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 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) LP

1 ½”(38mm) NAT 1/4” (6mm) LP

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.

If fan motor is replaced, the silicone rubber gaskets, see page 14, Index No. 5, Part No. 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.

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