Fulton Pulse HW (PHW) Fully Condensing Hydronic Boiler - Manual (Page 41)

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SECTION 3
PHW-IOM-2013-0214
OPERATION
3-5
6. Check combustion at high fi re. Make adjustments to air
fl apper, and incoming gas. Air fl apper adjustments are
to be made at high fi re only.
NOTE: At high fi re, the gas and exhaust butterfl y valve will be
full open in the horizontal position.
LOW FIRE SETTINGS
1. Manually adjust the temperature controller on the front
of the boiler to read 50% input. At 50% check to see if
the unit is within test fi re values. Proceed to step the
boiler down to 40%, 30%, 20% 10% and 0% each time
checking to see if the unit is within test fi re values. 0%
represents low fi re and 100% represents high fi re.
2. If you are unable to reach 0%, you will need to make
adjustments on the gas valve to either increase or
decrease fuel input. The exhaust butterfl y valve may
also need adjustment. Start by adjusting one valve at a
time.
3. The gas butterfl y valve should be used to adjust Low
Fire input. The exhaust butterfl y valve should be
adjusted to set proper combustion. Closing the exhaust
butterfl y valve will also decrease input slightly.
4. At Low Fire the linkage arms should NOT begin or fi nish
travel in the vertical position. If this occurs there is a
possibility that the gears will bind and cause damage to
the mod motor.
PROCEDURE TO ZERO AND SPAN THE MODULATION MOTOR
The following steps are performed on each modulation (mod)
motor at the factory. It may be necessary to do in the fi eld
in the event the mod motor requires replacement or the
mod motor linkage is moving up or down the range when
there is no change in the operating or setpoint temperature
diff erence.
1. Turn switch to Off position and power down the boiler.
2. Disconnect (-) and (+) from the mod motor. Tape or wire
bug the loose electrical wires.
3. Using a 4-20 mA source, connect (+) lead to (+), and (-)
lead to (-) on the mod motor.
4. Adjust the start potentiometer fully clockwise
(maximum zero) and the span potentiometer fully
counterclockwise (minimum span).
5. Reapply power to the boiler.
6. Set the 4-20 mA source to 4 mA to drive the motor to
the closed position.
7. Turn the start potentiometer slowly counterclockwise
until the motor begins to open. This is defi ned as the
start or zero position.
8. Set the 4-20 mA source to 20 mA to drive the motor to
the fully open position. The motor will open.
9. Turn the span potentiometer clockwise until the motor
starts to close. The diff erence between the fully open
span position current and the zero position current is
defi ned as the operating span.
10. Recheck the start and readjust the span potentiometer
if necessary. Turn the start potentiometer clockwise to
increase the zero position.
11. Recheck the span and readjust the span potentiometer
if necessary. Turn it clockwise to increase the full span
position.
12. Power down 4-20 mA source and boiler.
13. Remove 4-20 mA source, and rewire the mod motor.
14. Power boiler up, and turn switch to On.
If the Boiler Doesn’t Start
Proceed as follows:
1. Adjust blocked air intake switch (BIS)
2. Screw the switch fully in. Do not over tighten the screw.
3. With the boiler running in manual and 100% high fi re,
back the switch out until the boiler switches off .
4. Turn the BIS in one full turn.
5. Re-start the boiler.
NOTE: Do not change the Flame Pressure Switch settings.
6. Check that the temperature control is set higher than
water temperature in the boiler. Check for tripped
circuit breaker or blown fuse.
7. Check for possible restrictions (foreign objects, snow,
rags, leaves, etc.) in either the air supply inlet or the
exhaust outlet on the outside of the building. Check for
proper water level in the boiler (low water cutoff ).
8. If the boiler still does not operate, follow these