Hydro Tek HG SERIES, Operation & Maintenance Manual

Page: 9 / 24

SYSTEM INFORMATION 9
runs out of water, adjust or replace the float valve inside
the tank and check the inlet water feed pressure.
WATER TREATMENT: The inlet water can be deion-
ized for spot free rinse or softened to make detergents clean
more effectively. Do not use deionized water through the
coil on a hot water machine or coil corrosion will result.
Water softeners, however, will reduce coil scale deposits
and should be installed if your water is especially hard.
HEATING SYSTEM:
COIL/HEAT EXCHANGER SYS-
TEM: The heat exchanger contains a
continuous coil of pipe which forms a cold
water jacket around the outside of the
heating area. It is double wrapped with
ceramic blanket insulation and a stainless steel cover.
The inside of the coil assembly can become covered with
soot if it is fired with diesel fuel and the burner is out of
adjustment. This can be cleaned by removing both end caps
of the heat exchanger enclosure and brushing or spraying
off debris or by adding a soot removal agent (Part # CB200)
to the diesel fuel.
When the water is heated, scale (calcium) will begin
to form on the inside of the coil pipe depend-
ing upon the hardness of the water in your
area. The coil can be DESCALED by using
a scale remover (Part # CB105) available at
your authorized Hydro Tek dealer. It is necessary
to perform this service only when a noticeable pressure drop
is detected across the coil. Follow directions to avoid damage.
Wear safety glasses.
TEMPERATURE SWITCH: The burner is equipped
with a high temperature limit switch which will shut off the
burner when the water temperature becomes too hot. Some
units come with an adjustable thermostat.
STEAM INSTRUCTIONS:
If your unit is steam - capable, install the green steam nozzle,
turn thermostat to 250° F.
PRESSURE/VACUUM/FLOW SWITCH: The burner is
equipped with either a pressure switch, flow and/or a vacuum
switch to control the burner. When the trigger on the spray gun
is squeezed, water begins to move through the coil and
pressurize. The vacuum/flow/pressure switch turns the burner
on and begins to heat the water. Whenever the water spray
stops or if the water is shut off, the burner will shut off.
WARNING: Burner should fire only when the trigger
is squeezed and spraying water, if it comes
on at any other time, shut off machine and
have it serviced.
DIESEL FIRED BURNER: The diesel
fired burner is a forced draft pressure atomizing
burner. Diesel fuel is sprayed out of an atom-
izing nozzle, mixed with air, and ignited by a high voltage spark.
The flame is directed towards the coils of pipe which, in turn,
heats the water flowing through it. Use clean #2 DIESEL
FUEL for the burner or substitute #1 diesel, light fuel oil, or
Kerosene if diesel is not available.
AIR BAND adjustments may need to be made to compen-
sate for higher elevations, or if more than a trace of smoke is
observed in the burner exhaust. The ELECTRODES may
need to be cleaned and adjusted periodically. These adjust-
ments have to be made precisely and should be performed only
by qualified personnel. Set between #1 & #2 on smoke gauge.
The FUEL PUMP is a self priming, low volume pump which
is propelled by the burner motor. The fuel pump pressure is
typically set at 100 PSI but can be turned as high as 140 PSI during
the winter when the incoming water temperature is lower.
Before adjusting the fuel pressure, connect a fuel pressure gauge
and an outlet water temperature gauge, turn the pump and burner
on, and turn the fuel pressure screw clockwise until the desired
water temperature is obtained. Be sure not to exceed the
recommended specifications of the machine.
The FUEL FILTER will need to be cleaned often if the
diesel fuel quality is poor. A fuel filter with a water separator is
recommended if the fuel quality is consistently poor.
The FUEL SOLENOID is an electric fuel valve
which shuts off the fuel whenever the trigger on
the spray gun is released or if the set temperature
on the heat switch is exceeded.
The IGNITION TRANSFORMER provides a high voltage
spark which travels down the electrodes to ignite the diesel fuel.
Disconnect all power before servicing.
The 12 VOLT BURNER operates from the battery on the ST/
SM/SR Series. The engine has a 15 to 16 amp charging system
which keeps the battery charged which runs the burner. The
burner motor and transformer stops when the trigger gun is
released. Its best to release the trigger gun periodically, and also
cool down the burner before shutting off the engine to keep the
battery fully charged. Shut off burner & engine switch when
unattended.
PRESSURE DELIVERY SYSTEM:
TRIGGER GUNS: The trigger gun is merely a valve that turns
water spray on and off. If it begins to leak or fails to shut off,
replace or repair the valve assembly.
Never lock the gun in
the on position or point it at any person or any part of the
body.
Machines that spray steam only are equipped with an
open gun that does not shut off the water spray.
SPRAY WAND: Wands are available in 2 to 6 foot
lengths for various cleaning applications. If the unit is
equipped with a dual wand you can adjust the pressure by
turning the knob on the valve to divert part of the water
through the low pressure nozzle.
NOZZLES: The spray nozzle is a precisely machined orifice
made of hardened stainless steel. The orifice size is matched to the
BF020
BF025
BF015