PVI Industries FIREPOWER PV500-9 - Manual (Page 6)

PV500-9 04-2000 (6) Section 9
AIR ADJUSTMENT
FIXED AIR BURNERS
Loosen the locking screw and move the arm (B) along
the scale (C) to the position wanted and tighten the
screw. Check the air adjustment by making a flue gas
analysis.
Figure 9-4
AIR ADJUSTMENT
VARIABLE AIR BURNERS
Adjust first air shutter by loosening locking screw
and move arm (B) along scale (C) to give best
flame signal strength and most consistent light-off
with pilot pressures set. Set second shutter linkage
by installing linkage rod into ball joints of
modulating motor and air damper shaft arm. With
damper closed and modulating motor in full down
position, set ball joints secured. Observe
combustion reading through full range of
modulation. Adjust as needed to obtain proper
combustion efficiencies with carbon monoxide-free
combustion. Make all adjustments with linkage in
the low fire position. CAUTION: Do not allow the
modulating motor to push the air damper past
the full open or full closed position while
making adjustments. Damage will occur. Record
damper positions from indicator dials and hold
linkage rod in ball joint with fingers as motor
actuates to eliminate this risk. After correct damper
movement is determined, tighten ball joint screws.
Figure 9-5
BURNER MOTORS
No routine service is necessary on the blower system other than cleaning the blower wheel or oiling the motor when
necessary. Blowers using three-phase motors will run in either direction depending on the connection of the power supply.
On new installations, motor replacement or power supply disturbance, the rotation must be checked. Corrections can be
made by interchanging any 2 wires of the three-phase power supply.
NOMOGRAPH FOR DETERMINING FLUE LOSSES FROM CO
2
AND FLUE TEMPERATURE FOR NATURAL GAS
(STEADY STATE EFFICIENCY CAN BE DETERMINED FROM THE FLUE LOSS)