Pressure Switch Adjustments; System Control Check Out Procedures; Trouble Shooting Hints; Maintenance - Field Controls 46304000 Manual

PRESSURE SWITCH ADJUSTMENTS

With the venter air flow set and the appliance operating at the best operating
efficiency, adjust the pressure switch by rotating the adjustment screw
clockwise until the burner shuts off, then rotate the adjustment screw
counterclockwise until the burner fires. Rotate the adjustment screw an
additional 1/4 turn counterclockwise to ensure proper switch setting. (See
Figure 6)

SYSTEM CONTROL CHECK OUT PROCEDURES

1. Adjust the thermostat to call for heat and observe the power venting
system for proper operation sequence (Repeat if necessary).
a. Thermostat calls for heat.
b. Relay is energized and venter motor starts.
c. Pressure switch closes and burner starts.
d. Thermostat is satisfied, burner stops and venter motor should operate for approximately 3 to 5 minutes.
2. While system is operating, disconnect power to the venter motor. This should open the pressure switch contacts and stop
burner operation.
3. (If WMO-1 switch is installed) Allow vent system to cool. Disconnect the vent pipe between the venter inlet and the
appliance outlet. Block the vent pipe with a noncombustible material. Activate the heating system with the main burner
operating. Allow approximately 2 minutes or less for the secondary safety switch to deactivate the burner. Reset safety
switch and repeat.

TROUBLE SHOOTING HINTS

1. Main burner does not fire when thermostat calls for heat with venter operating.
a. Check pressure switch adjustment.
b. Check fuel flow.
c. Check wiring connections between pressure switch and burner.
d. Check pressure switch for continuity across terminals, during venter operation.
2. Venter does not activate when thermostat calls for heat.
a. Jump wire the terminals L1 and M to ensure motor operation.
b. Check wiring.
3. Flue gas odor.
a. Check system draft.
b. Check post purge venting time.
c. Check for negative pressure in building.

MAINTENANCE

1. Motor: Inspect motor once a year; the motor should rotate freely.
2. Wheel: Inspect venter wheel annually, for oil fired heating systems, clear any soot, ash or coating, which inhibits either
rotation or air flow. Remove all foreign material before operating.
3. Vent System: Inspect all vent pipe connections annually for looseness and for evidence of flue gas leakage. Seal or
tighten pipe connections if necessary.

INSTALLATION INFORMATION

MODEL NO.:_____________________________________________________________
INSTALLER'S NAME:______________________________________________________
INSTALLER'S COMPANY:__________________________________________________
INSTALLER'S PHONE NO.:_________________________________________________
DATE OF INSTALLATION: _________________________________________________
CK-
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Figure 6
P/N 46304000 Rev C 04/01