13
Operations
If the pressure washer is to be used in an enclosed area,
a flue must be installed to vent burner exhaust to the
outside atmosphere. Be sure the flue is the same size as
the burner exhaust vent on the pressure washer lid. Poor
draft will cause the pressure washer to soot and not
operate properly. When selecting the location for installa-
tion, beware of poorly ventilated locations or areas where
exhaust fans may cause an insufficient supply of oxygen.
Proper combustion can only be obtained when there is a
sufficient supply of oxygen available for the amount of
fuel being burned. If it is necessary to install the machine
in a poorly ventilated area, outside fresh air may have to
be piped to the burner and a fan installed to bring suffi-
cient air into the machine. Locate the pressure washer
so that the flue will be as straight as possible and
protrude through the roof at a proper height and location
to provide adequate draft. The burner air setting must be
adjusted after installation of vent and set to a #2 or better
smoke spot on the Bacharach scale.
This operator's manual indicates this machine is to be
vented through the ceiling using straight pipe or 45°
elbows. It also discourages the use of any 90° venting
elbows which restrict air flow through the burner causing
poor burner conditions.
It is important that the licensed contractor consult local
building codes. Hotsy can only make recommendations
and the selection of the venting must take into account
the type of roof or wall material it contacts which could
change the vent requirement for compliance with local
building codes
Oil Burner
Burner Air Adjustment:
The oil burner on this machine is preset for operation at
altitudes below 500 feet. If operated at higher altitudes, it
may be necessary to adjust the air band for a #1 or #2
smoke spot on the Bacharach scale.
To adjust, start machine and turn burner ON. Loosen two
locking screws found on the air band and close air band
until black smoke appears from burner exhaust vent.
Note air band position. Next, slowly open the air band
until white smoke just starts to appear. Turn air band
halfway back to the previously noted position. Tighten
locking screws.
For higher altitudes, the air band opening may need to
be increased; for lower altitude, the air band may need to
be decreased.
For higher humidity, the air band opening may need to be
increased; for lower relative humidity, the air band may
need to be decreased.
For higher ambient temperatures the air band opening
may need to be increased; for lower ambient tempera-
tures, the air band opening may need to be decreased.
Adjust to your operating location's environment as-
needed for best smoke spot and performance compliant
with local, state, and federal regulations.
CAUTION: If white smoke appears from burner
exhaust vent during start-up or operation, discon-
tinue use and readjust air bands.
NOTE: If a flue is installed, have a professional
serviceman adjust your burner for a #1 or #2 smoke
spot on the Bacharach scale.
It is recommended that the oil burner be serviced yearly
or as needed. Contact your local service center.
Fuel Pressure Adjustment:
To adjust fuel pressure, First install a pressure gage into
the port just after the pump fuel exit. Turn the adjusting
screw (located at the regulator port) clockwise to
increase, and counterclockwise to decrease. Do not
exceed 200 psi or lower the pressure below 130 PSI,
when checked at the post-pump pressure port.
The fuel pressure may need to be adjusted due to
altitude. For every 500 ft altitude above sea level, the
boiling point of water goes down 1 °F. At high altitude
environments, this boiling point change may require the
heat input to be lowered so the water input does not turn
to steam earlier than at the factory settings and activate
the pressure sensors and pressure relief equipment
when the unit is operated and much higher altitudes from
factory settings or local dealer site settings. Check with
your dealer before making local site fuel pressure adjust-
ments.
Also, as ambient temperature changes seasonally, the
fuel temperature in the feed tank and air temperature
inlet can impact fuel flow. In more extreme temperatures,
this local-site adjustment may also require different fuel
nozzles for fuel inlet temperatures that are at seasonal
extremes (higher or lower) in locations where the
temperature changes are beyond moderate tempera-
tures of between 40°F and 90°F. Colder temperatures
will make for a thicker flow and less fine a fuel spray
while hotter temperatures will make for a thinner flow a
more fine spray with the same nozzle. Consider alternate
nozzle configurations from the baseline factory-supplied
nozzle for operating in such temperature extremes if
performance is not meeting needs with air band and fuel
pressure settings alone.
NOTE: When changing fuel pump, a by-pass plug
must be installed in return line port or fuel pump will not
prime
.
MANUAL, OPERATOR, HOTSY, STAT ELECTRIC, OIL 8.916-831.0 - D
