FULTON PHW 1000, Installation, Operation And Maintenance Manual

Page: 68 / 94

Fulton Heating Solutions, Inc. -- PHW Manual -- 2010-0713
Page 68
1. The location of the linkage rods and the speed at which the butterfly gas valve
and butterfly exhaust valve opens or closes will determine whether the unit
operates smoothly or not.
e) Gas Butterfly Valve Side
1. The longer the radius on the mod motor pivot arm, the quicker the gas butterfly
valve shuts off. Conversely, the shorter the radius the slower the gas butterfly
valve shuts off. The longer the radius on the gas valve pivot arm, the slower the
gas butterfly valve shuts off. Conversely, the shorter the radius the quicker the
gas butterfly valve shuts off.
f) Exhaust Butterfly Valve Side
1. The longer the radius on the mod motor pivot arm, the quicker the exhaust
butterfly valve shuts off. Conversely, the shorter the radius the slower the
exhaust butterfly valve shuts off.
2. The longer the radius on the exhaust valve pivot arm, the slower the exhaust
butterfly valve shuts off. Conversely, the shorter the radius the quicker the
exhaust butterfly valve shuts off.
3. At High Fire the linkage arms should NOT begin or finish travel in the vertical
position. If this occurs there is a possibility that the gears will bind and cause
damage to the mod motor.
4. The gas pressure regulator is the only means for adjusting High Fire input to the
factory test fire values. After the boiler is operated at High Fire to the desired
settings, proceed to operate at Low Fire.
Note
At high fire, the gas butterfly valve will be full open in the horizontal position.
Exhaust butterfly valve will be full open in the vertical position.
g) 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 fire 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 fire values. 0% represents low fire and 100% represents high
fire.
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 butterfly valve may
also need adjustment. Start by adjusting one valve at a time.
3. The gas butterfly valve should be used to adjust Low Fire input. The exhaust
butterfly valve should be adjusted to set proper combustion. Closing the exhaust
butterfly valve will also decrease input slightly.