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Deliming Coil:
In alkaline water areas, lime deposits can accumulate
rapidly inside the coil pipes. This growth is increased
by the extreme heat build up in the coil. The best pre-
ventative for liming conditions is to use high quality
cleaning detergents. In areas where alkaline water is
an extreme problem, periodic use of Landa Deliming
Powder will remove lime and other deposits before coil
becomes plugged. (See Deliming Instructions for use
of Landa Deliming Powder.)
Periodic coil deliming is recommended.
1. Fill a container with 4 gallons of water, then add
1 lb. of deliming powder. Mix thoroughly.
2. Remove nozzle from spray gun assembly and put
spray gun into container.
3. Attach a short section (3-5 ft.) of garden hose
to machine to siphon solution from an elevated
container or add mixture to the float tank. Turn
pump switch on allowing solution to be pumped
through coil and back into the container. Solution
should be allowed to circulate 2-4 hours.
4. After circulating solution flush entire system with
fresh water. Reinstall nozzle in spray gun.
GAS VALVE REGULATOR
ADJUSTMENT
Adjustment of the built-in regulator isn't normally
necessary, since it is preset at the factory. However,
field adjustment may be accomplished as follows:
1. Attach manometer at pressure tap port.
2. Remove regulator adjustment screw cap.
3. With a small screwdriver, rotate the adjustment
screw clockwise to increase or counterclockwise
to decrease gas pressure.
4. Replace regulator adjustment screw cap
(see Figure 5).
Figure 5
Gas Valve Regulator Adjustment
Lines To
Pilot Light
Inlet
Manifold
Pressure
Adjustment
Screw
Under Cap
16
MAINTENANCE & SERVICE
On/Off
Switch
Gas Valve
Regulator
Adjustment
Outlet View
8.913-939.0 • LANDA VNG • Rev. 5/11
Pressure Relief Valve
Each machine is equipped with a relief valve to re-
lieve pressure in the system when higher than normal
operating pressures are encountered. If operating
pressure of machine is found to be normal and relief
valve continues to leak, repair or replace the valve.
CAUTION: Relief valve can become obstructed by
deposits and must be unscrewed at least once per
year to allow discharge.
PROPANE GAS
General Safety Precautions
Have a qualified gas service person assist in any gas
burner installation or service. Few maintenance people
or mechanics are knowledgeable in gas controls or
related safety practices. Propane gas is heavier than
air; unburned propane gas will gravitate to the floor
rather than rise out of the stack. Hence, adequate floor
space and good ventilation are especially important
with propane systems.
Gas Pressure Requirements
All propane fired machines operate on vapor propane
fuel only. They are designed to operate at a pressure of
11 w.c.i. (between 1/3 and 1/2 of one psi), and are
often operated at even higher pressures when extra
heat is needed.
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
propane 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 tem-
perature can fall to the point at which it cannot provide
vapor gas as rapidly as is needed. In this case, it may
be necessary to warm the propane cylinder by direct-
ing a warm spray, not over 120°F, on the cold cylinder
or by manifolding two propane bottles together to in-
crease 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 desired.
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