inlet flow is too low or if there is air in the water
supply, the pump will run rough, pulsate and lose
pressure. Maximum inlet water temperature is
145°F. Do not restrict inlet water supply. If the
pump is run dry, it can quickly overheat. The water
is filtered by a garden hose adapter screen. Clean
and replace as required or install a large capacity
strainer to insure a clean supply of water.
Direct water feed: Maintain an inlet water pressure
between 25 PSI and 60 PSI using a
⅝” to ¾” I.D.
hose. Install a back flow preventer on your supply
hose if State or Local ordinances require it. Install
a water regulator if your water pressure exceeds 60
PSI.
Float tank water feed: A
float tank is usually used
to regulate the incoming
water supply to the pump
and introduce chemicals into the inlet of the pump.
The float tank and filter (located inside the tank)
should be flushed out if debris accumulates in the
bottom. If the float tank overflows or runs out of
water, adjust or replace the float valve inside the
tank and check the inlet water feed pressure.
Bulk tank water supply: Large capacity water
supply tanks can be used with most units if water is
not readily available at the washing site. Belt
driven, low speed pumps (less than 1750 RPM) can
draw from a tank if you ensure that the vacuum
does not exceed negative 3psi. A 80 mesh, 200
micron strainer and a ¾” I.D. or larger suction hose
must be used to maintain a clean and adequate
water supply. Larger flow (8-10gpm) machines
require 1” feed and filtration. Be sure that the water
supply is free from air or damage to the pump may
result. Periodically you should clean out the
strainer and water supply tank to remove debris
that may accumulate on the bottom. If a water
supply tank and a float tank are both utilized, a
special three way valve can be used to switch
between tanks.
USING DE-IONIZED OR SOFTENED WATER IN
YOUR POWER WASHER: Do not use de-ionized
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 SYSTEM: 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 the burner is out of adjustment
or if it is fired by diesel fuel. This can be cleaned by
removing both end caps on the coil enclosure and
brushing or spraying off debris, or by adding a soot
removal agent (Part #CB200) to the diesel fuel.
Both a diesel fuel pressure gauge and smoke test
device is required for proper burner adjustment,
and must be performed by a qualified technician.
When the water is heated, scale (calcium) will
begin to form on the inside of the coil pipe
depending upon the hardness of the water in your
area. To remove buildup in the coil, use a scale
remover (Part #CB100) available at your authorized
Hydro Tek dealer. Perform this descaling 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. Hot water machines are
equipped with an adjustable thermostat so that the
operator can control the outlet water temperature.
The burner will automatically cycle on and off to
maintain the desired temperature.
STEAM INSTRUCTIONS: If your unit is steam
capable, install the green steam nozzle, turn
thermostat to 250° F.
PRESSURE/FLOW SWITCH: The burner is
equipped with either a pressure switch or a flow
switch to control the burner. When the trigger on
the spray gun is squeezed, water begins to move
through the coil and pressurize. The 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.
DIAGNOSTIC LIGHT: The burner diagnostic light
on the rocker switch (if equipped) can help in
determining problems with the burner. The red light
indicates that power is going to the fuel solenoid
valve. The burner should be firing and heating the
water whenever the red light is on. When the
trigger on the spray gun is released or if the
temperature set point is exceeded, the red light will
go off and the burner will stop firing.
SYSTEM INFORMATION
9
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