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Operations

1. Disconnect the machine from the power source.

2. Remove the chassis front panel to gain access to

the gas valve.

3. Turn the gas valve ON/OFF knob to the OFF

position.

4. Use pipe thread sealing compound at all hose

connections and at gauge port pipe plugs to
prevent leaks.

DO NOT

use teflon plumbing tape.

5. Attach a 3/4" inside minimum diameter LP gas

hose to the inlet port of the machine.

Make sure

you use a hose that is suitable for LP gas.

6. Install the gas pressure gauge or manometer into

the gas valve inlet pressure tap. The reading at this
location will indicate the incoming gas pressure
from your gas bottle primary regulator.
It is very important that the incoming gas pressure
be between 12.0-14.0 water column inches (.43 -
.50 PSI).

WARNING: Maximum inlet pressure to machine
14.0 water column inches (.50 PSI).

To control the pressure from the LP bottle you must
have a primary regulator. If you purchase a regulator
from Hotsy, Part Number 860178, it will be preset from
the manufacturer and should not require adjustment. If
your primary regulator does not produce the correct
pressure range contact your local Hotsy Service Repre-
sentative. After connecting the gas hose to your regu-
lator, install the regulator on the bottle. The regulator
860178 has a POL fitting which will screw directly into
an LP Vapor fuel bottle.

7. The gas pressure coming out of the regulator and

going to the burner ring has been factory set for
elevations of 0 to 2000 ft. Altitudes greater than
2000 ft will require adjustments to the gas manifold
pressures. Consult your local service dealer for
high altitude adjustments. In Canada, certification

for installation at altitudes over 4500 feet above
sea level is the jurisdiction of local authorities. You
should not readjust the burner ring gas pressure. If
you replace your gas valve, you will need to adjust
the new valve. Refer to your machine’s

specifica-

tion plate

for the correct pressure setting. Follow

the installation and adjustment instructions
provided with your replacement valve.

NOTE:

Air for combustion and ventilation along

with exhaust flue sizing must conform to methods
outlined in current American Standard (ANSI-
Z223.1) National Fuel Gas Code or National
Standard of Canada CSA-149.1 and CSA-149.2
“Installation Code for Gas Burning Appliances”.

8. After correct pressures have been established,

remove gauge and replace with pipe plug.

9. Always check new gas line connections for leaks

with soapy water.

10. Reinstall the chassis front panel on the machine.

Converting From LP to Natural Gas Fuel

CAUTION: Have a qualified gas service technician
modify, install and service your equipment.

The Model 771 has been factory built to use LP Vapor
fuel, however this model can be field converted to run
on natural gas fuel.

It is very important to follow these

instructions when converting the unit for natural gas
fuel. Modifications will need to be made to several
components within the washer. Before starting, discon-
nect gas and electrical power supply from the machine.

You will need the following items:

•

Gas pressure gauge or gas manometer

•

10" Adjustable wrench

•

Medium Phillips head screwdriver

•

Large slot head screwdriver

•

3/16" Allen wrench

•