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16
Maintenance
Fuel Control System
These machines utilize a fuel solenoid valve located on
the fuel pump to control the flow of fuel to the combus-
tion chamber. This solenoid valve, which is normally
closed, is activated by a flow switch when water is
flowing through it. When an operator releases the
trigger on the spray gun, the flow of water through the
flow switch stops, turning off the current to the fuel
solenoid. The solenoid then closes, shutting off the
supply of fuel to the combustion chamber. Controlling
the flow of fuel in this way allows for an instantaneous
burn or no burn situation, thereby eliminating high and
low water temperatures, and combustion smoke
normally associated with units incorporating a spray
gun.
CAUTION: Periodic inspection is recommended to
insure that the fuel solenoid valve functions
properly. This can be done by operating the
machine and checking to see that when the trigger
on the spray gun is in the off position, the burner is
not firing.
Fuel Pressure Adjustment
To adjust fuel pressure, turn the adjusting screw
clockwise to increase, counterclockwise to decrease.
Do not exceed 200 psi.
NOTE:
When changing fuel pump, a bypass plug must
be installed in return port or fuel pump will not prime.
Electrode Setting
Burner Nozzle
Keep the tip free of surface deposits by wiping it with a
clean, solvent-saturated cloth, being careful not to plug
or enlarge the nozzle. For maximum efficiency, replace
the nozzle each season.
Electrode
Periodically Check Wiring Connections. If Necessary
To Adjust Electrodes, Use Diagram.
Landa PGDC Operator’s Manual 8.916-596.0 - P
KNA Burner Gauge
SERVICE HO
TLINE 1-800-833-1600
C
E
L
Z
Z
O
N
L
ELECTR
O
DE POSITION
1/8 FOR A
C
CONE
8.922-740.0
ELECTR
O
DE GAP
1/8 MIN 5/32 MAX
ELECTR
ODE POSITION
3/16 FOR DC CONE
3/16” FOR
DC CONE
1/8” FOR
AC CONE
1/4” Above
Nozzle Center