Field Controls 46400900 Manual page 7

ADJUSTMENTS
P S A
RESSURE WITCH DJUSTMENTS
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
counterclockwise until the burner fires. Rotate the
adjustment screw an
counterclockwise to ensure proper switch setting. (See
Figure 7)
P P T A
OST URGE IMING DJUSTMENT
To adjust the post purge time, rotate the timer adjustment
on the timer clockwise to increase the operation time. To
decrease the operation time, rotate the timer adjustment
counterclockwise. (See Figure 8) Typical post purge
time should be between 3 to 5 minutes. If running
burner simultaneous with venter, 1-3 minutes is
suggested.
S C C
YSTEM ONTROL HECK
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.
The LED light indicates power to T3. When the
pressure switch closes with a call for heat, the
LED light will come on. This indicates that the
burner should be in a burn cycle. (See Figure
8)
d. Thermostat is satisfied, burner stops and venter
motor should operate for the set post purge time.
The LED should not be on during the post purge.
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 after waiting 15 minutes for WMO-1 to cool down and repeat.
YEARLY MAINTENANCE PROCEDURE FOR POWER VENTER
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.
4. Lubricate motor with SWG Superlube with 6 drops in each oil port hole annually.
rotate the adjustment
additional 1/4 to
O P
UT ROCEDURES
screw
1/2 turn
Post Purge
Adjustment
Location
Page 7
Figure 7
Figure 8
LED
light