Flame Rod Adjustment
). Make sure the flame rod
shaft is not shorted against gun discs or pilot burner .
Pilot Location Adjustment
The location of the pilot burner (see
opening through the gun discs can be adjusted by bending the
pilot brackets . Improper adjustments can result in rough light
off. The flame rod must also be adjusted so it does not short
against the gun discs .
Figure 11:
Ignition Electrode and Flame Rod
Figure 12:
Pilot Location
Air Pickup Tube Adjustment
The proper location for the tube is indicated (see
) .
When changes in the pilot air pressure are required, the pilot
air pickup tube can be repositioned . Tipping the tube further
into the airstream (increasing angle M°) will increase the pilot
air . Bending it more perpendicular to the airstream (decreasing
angle M°) will decrease the pilot air . If the tube is kinked or
flattened, pilot air is reduced. This can lead to unstable pilot
operation and nuisance tripping of the flame safeguard. Once
kinked, the tube will probably have to be replaced .
Figure 13: Air Pickup Tube
Gun Assemblies
The Daikin gas burner has an easily removable gun assembly
which includes the complete pilot burner assembly and the
main flame burner head. The position of this assembly within
the burner blast tube determines the shape of the flame.
This is adjusted at the factory and normally does not require
readjustment in the field.
The burner discs must be perpendicular to the blast tube to
have a symmetrical flame. The discs must not be positioned
forward into the conical portion of the blast tube . Moving the
discs toward this conical portion of the blast tube spreads the
flame. Move the discs farther back into the cylindrical portion of
the tube lengthens and narrows the flame.
Figure 14: Gas Burner
.00 to .03
Porcelain
Bushing
Spring
Igition Electrode
Adjustment
.25
.32
Flame Rod
Adjustment
.06
.06
.09
Models 200 thru 250
.06
Flush
Center Pilot
To Cutout
Models 320 thru 2000
CL
A
.38
A
20°
1.00
Pressure Switch Sensing Tube
Pilot Air Pickup Tube
Section A-A
M°
M = 20° Models 020 thru 100
M = 10° Models 110 thru 200
(Dimensions
on Figure 16)
A
Service
www .DaikinApplied .com 17
IM 684-6 • ROOFTOP SYSTEMS
