Inspecting & Testing Gas Piping; Gas Pressure; Warning And Check Lists - Landa VNG/VLP3-11021D Operator's Manual

VNG/VLP SERIES PRESSURE WASHER
Inspection and Testing Gas Piping:
The building structure should not be weakened by install-
ing the gas piping. The piping should not be supported by
other piping, but should be firmly supported with gas hooks,
straps, bands or hangers. Butt or lap welded pipe should
not be run through or in an air duct.
Before turning gas under pressure into piping, all open-
ings from which gas can escape should be closed. Imme-
diately after turning on gas, the system should be checked
for leaks. This can be done by watching the 1/2 cubic foot
test dial and allowing 5 minutes to show any movement,
or by soaping each pipe connection and watching for
bubbles. If a leak is found, make the necessary repairs
and repeat the above test.
Defective pipes or fittings should be replaced and not re-
paired. Never use a flame or fire in any form to locate gas
leaks, use a soap solution.
After the piping and meter have been checked completely,
purge the system of air. DO NOT bleed the air inside an
enclosed room.
The appliance and its individual shut-off valve must be
disconnected from the gas supply piping system during
the pressure testing of that system at test pressure in
excess of 1/2 psig or damage to the gas valve will occur.

Gas Pressure:

The ideal incoming gas pressure is 11" wc (water column)
(minimum 6" wc, maximum 14" wc or 1/2 psig). The cor-
rect operating manifold pressure for natural gas is 3.5"
wc. The operating manifold pressure for propane gas is
11" wc. The gas valve pressure regulator can be adjusted
between 3" and 4" wc natural gas or 6" and 11" wc for
propane.
If the desired input rating cannot be obtained within the
above manifold pressure adjusting range, the next size
larger or smaller burner orifice should be used.
WARNING & CHECK LIST
WARNING
1. Installation or servicing of gas appliances and con-
trols must only be performed by qualified personnel.
After installation or servicing, test manual valve, op-
erating valves, pressure regulation, and automatic
shut-off valve for proper operation.
2. Install in a suitable dry location. The unit must be lo-
cated in an area properly protected from the weather.
3. Shut off gas and electricity before starting installation
or service. Turn gas back on to test or operate.
4. DO NOT connect pressure washer before pressure
testing gas piping. Damage to gas valve may result
(6" - 14" W.C.P . or 1/2 psig).
5. DO NOT insert any object other than suitable pipe or
tubing in the inlet or outlet of the gas valve. Internal
damage may occur and result in a hazardous condi-
tion.
6. DO NOT grip gas valve body with a pipe wrench or
vise. Damage may result causing gas leakage. Use
inlet or outlet bosses or a special body wrench.
7. DO NOT short the gas valve terminals.
8. DO NOT allow any flame to impinge on the regulator
vent tubing if supplied. It may clog and cause gas valve
malfunction.
9. DO NOT use the gas cock to adjust the gas flow.
10. In case main burner fails to shut off, turn off gas supply.
11. Keep all combustible materials away from gas appli-
ances. DO NOT allow lint or dust to collect in burner
area.
12. Dials must only be operated by hand. Never use pli-
ers, wrenches or other tools to turn dials.
13. Leak test with a soap solution after installation or ser-
vice with the main burner on. Coat pipe and tubing
joints, gaskets, etc. Bubbles indicate leaks.
14. If the unit is installed in an enclosed room, care should
be taken to ensure that an adequate supply of air is
available for combustion and ventilation (1 sq. inch
per 1000 BTU).
OPERATOR'S MANUAL
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