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BURNER FEATURES
Operated Automatic Valve
This machine is equipped with an Intermittent Pilot
Ignition System. This system is designed to eliminate
the need for a constant burning pilot. Lighting of the
pilot is accomplished through electronic spark ignition
each time the burner and flow switch call for heat. The
pilot is not burning when there is no call for heat. Do
not attempt to light the appliance manually as a burn
injury or electrical shock may result. The pilot light will
remain on and the main gas valve is turned off when
the spray gun is closed.
Care of Main Burner
Due to condensation from heater coils dripping down
on the burners, scale build-up may occur in the burner
jet orifices.
1. TO REMOVE BURNER MANIFOLD FROM WA-
TER HEATER COIL:
Turn off the gas to the main burner by turning the
knob to the "OFF" position on the gas valve and
the main gas supply.
Disconnect the pilot and ignition lines from the gas
valve. Disconnect union in main burner line below
thermostat. Slide burner manifold out through shell
opening.
2. TO CLEAN BURNER JETS:
Select proper size drill for type gas involved. Use
pin vise to hold drill and ream out each jet orifice.
CAUTION: Do not ream out orifices to a
larger size.
If the water heater will be exposed to freezing weather,
an anti-freeze solution should be circulated through the
coil by whatever means are available for the particular
system the water heater is used on.
MAINTENANCE & SERVICE
8.913-939.0 • LANDA VNG • Rev. 5/11
To Adjust Pressure Regulator
Adjustment of the pressure regulator is not normally
necessary since it is preset at the factory. However,
field adjustment may be accomplished as follows:
1. Manometer attachment may be accomplished at
the pressure tap plug.
2. Remove regulator adjustment screw cap
(see Figure 5, page 14).
3. With small screwdriver, rotate adjustment screw
clockwise to increase, or counterclockwise to
decrease pressure.
4. Replace regulator adjustment screw cap.
17
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