Landa VNG4-2000 Operator'S Manual Download Page 17

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96-610 • LANDA VNG/VLP • REV. 9/05

PRESSURE

ASHER

OPERA

OR’S MANU

MAINTENANCE & SERVICE

Exterior regulators are needed to control the system.
Propane bottles are not included with the machine. A
high pressure regulator should be installed on the pro-
pane bottle and a low pressure regulator attached to
the pressure washer.

Propane Cylinder Capacity

An important consideration with propane systems is
the capacity of the supply cylinder relative to the needs
of the burner. The burner operates on propane as a
vapor gas. As gas is used from the propane cylinder,
the liquid in the cylinder boils to maintain vapor gas
pressure. This boiling process cools the liquid, and in a
heavy, continuous-demand situation, the liquid tempera-
ture can fall to the point at which it cannot provide va-
por gas as rapidly as is needed. In this case, it may be
necessary to warm the propane cylinder by directing a
warm spray, not over 120°F, on the cold cylinder or by
manifolding two propane bottles together to increase
total vaporization capacity. It is recommended that a
minimum 100 lb. vapor propane bottle be used on the
machine, depending on the length of running time de-
sired.

BURNER FEATURES

Operated Automatic Valve

This machine is equipped with an Intermittent Pilot Ig-
nition 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 re-
main 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.

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 Fig-

ure 5, page 14).

3. With small screwdriver, rotate adjustment screw

clockwise to increase, or counterclockwise to de-
crease pressure.

4. Replace regulator adjustment screw cap.