715-721 • HDS-NG LP • 9.800-160.0 • Rev. 4/10
11
PRESSURE WASHER
OPERATOR’S MANUAL
INSTALLATION
Before turning gas under pressure into piping, all open-
ings from which gas can escape should be closed.
Immediately after turning on gas, the system should
be checked for leaks. This can be done by watching the
1/2 cubic foot test dial for 5 minutes for 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
repaired. 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 com-
pletely, purge the system of air.
DO NOT bleed the air
inside an enclosed room.
During pressure testing of the system at test pres-
sures in excess of 1/2 PSIG, the appliance and its
individual shut-off valve must be disconnected from
the gas supply piping system or damage to the gas
valve will occur.
Gas Pressure:
The ideal incoming gas pressure is 11 water column
inches or w.c.i. (min. 6 wci, max. 14 wci or 1/2 PSIG).
The correct operating manifold pressure for natural gas
is 3.5 wci The operating manifold pressure for propane
gas is 10 wci By adjusting the gas valve pressure
regulator between 3 and 4 wci a side range can be
achieved for natural gas. Propane is 6-10 wci.
If the desired input rating cannot be obtained within the
above manifold pressure adjusting range, then the next
size larger or smaller burner orifice should be used.
CHECK LIST BEFORE
STARTING:
CAUTION! If “NO” is checked on any of the fol-
lowing sixteen questions, do not operate this
machine.
FOR YOUR SAFETY
READ BEFORE LIGHTING
WARNING
If you do not follow these instructions exactly, a fire
or explosion may result, causing property damage,
person injury or loss of life.
A. This appliance has a pilot which must be lighted
by hand. When lighting the pilot, follow these
instructions exactly.
B. BEFORE LIGHTING smell all around the
appliance area for gas. Be sure to smell next to
the floor because some gas is heavier than air
and will settle on the floor.
FOR YOUR SAFETY
“WHAT TO DO IF YOU SMELL GAS”
Do not try to light any appliance.
Do not touch any electrical switch, do no use any
phone in your building.
Immediately call your gas supplier from a neighbors
phone. Follow the gas supplier’s instructions.
If you cannot reach your supplier, call the fire
department.
C. Use only your hand to push in or turn the gas
control knob. Never use tools. If the knob will
not push in or turn by hand, don’t try to repair
it; call a qualified service technician. Forced or
attempted repair may result in a fire or explosion.
D. Do not use this appliance if any part has been
under water. Immediately call a qualified service
technician to inspect the appliance and to
replace any part of the control system and any
gas control which has been under water.
YES NO
Has gas supply been inspected by an
authorized contractor to meet local codes?
Is machine protected from downdraft and
excessive wind?
Is machine shielded from moisture or water
spray?
Is the voltage correct and are the circuit
breaker and supply cord adequate
according to specifications and serial plate
notation?
Is the machine electrically grounded?
Is there ample water supply?
Have all flammable liquids or gases been
removed from installation location?
Is there adequate gas supply for the BTU
rating of the burner?
Is incoming gas supply pressure between
6-14 water column inches or 1/2 PSIG?
Has the proper gas regulator been installed
for pressure and volume?
Is the machine properly vented to allow
adequate air flow?
Are the propane tanks large enough,
according to rating to prevent freezing
(vapor propane machines only)?
Have gas lines been checked for gas leaks?
Have gas lines been checked with local
codes?
Have all operators using this machine been
instructed properly & have they read the
manual?
Has the machine been installed according
to operator’s manual instructions?