17
Maintenance
The flow of combustion and ventilating air to the burner
must not be blocked or obstructed in any manner.
The area around the pressure washer should be kept
clean and free of combustible materials, gasoline and
other flammable vapors and liquids.
Maintenance And Service
Unloader Valves
Unloader valves are preset and tested at the factory
before shipping. Occasional adjustment of the unloader
may be necessary to maintain correct pressure.
Winterizing Procedure
Damage due to freezing is not covered by warranty.
Adhere to the following cold weather procedures
whenever the washer must be stored or operated
outdoors under freezing conditions.
During winter months, when temperatures drop below
32°F, protecting your machine against freezing is
necessary. Store the machine in a heated room. If this
is not possible then mix a 50/50 solution of anti-freeze
and water in the float tank. Turn the engine on to siphon
the anti-freeze mixture through the machine. If
compressed air is available, an air fitting can be
screwed into the float tank by removing the float tank
strainer and fitting. Then inject the compressed air.
Water will be blown out of the machine when the trigger
on the spray gun is opened.
High Limit Hot Water Thermostat
For safety, each machine is equipped with a tempera-
ture sensitive high limit control switch. In the event that
the water should exceed its operating temperature, the
high limit control will turn the burner off until the water
cools then it will automatically reset itself. The thermo-
stat sensor is located on the discharge side of the
heating coil. The thermostat control dial is located on
the control panel.
Pumps
Before running the pump check the pump crankcase for
a proper oil level. A proper oil level is indicated by the
red dot in the sight glass or between the high and low
marks on the dipstick. Use only SAE 30 non-detergent
oil. Change the initial oil after the first 50 hours and then
change the oil every 500 hours or every three months.
When draining oil, clean inside of crankcase to remove
all impurities.
CAUTION: When operating in damp places or with
high temperature fluctuations oil must be changed
immediately.
ATTENTION: Lorsque l'appareil est utilisé dans des
endroits humides ou où les températures fluctuent
fortement, l'huile doit être changée
immédiatement.
Cleaning of Coils
In alkaline water areas, lime deposits can accumulate
rapidly inside the heating coil. This growth is increased
by the extreme heat build up in the coil. The best
preventative for liming conditions is to use high quality
cleaning detergents. In areas where alkaline water is
an extreme problem, periodic use of Coil Conditioner
will remove lime and other deposits before coil
becomes plugged. (See Deliming instructions for use of
Coil Conditioner.)
Scale Protection
1. Fill container with Kärcher scale inhibitor fluid Rm
110.
2. Obtain water hardness values from local water
authority, or using a water hardness testing kit.
3. Adjust impulse transmitter in electric cabinet
(preset at #5.)
When operating unit without a scale protection, the
heater coil may become scaled.
Rupture Disk
If pressure from pump or thermal expansion should
exceed safe limits, the rupture disk will burst allowing
high pressure to be discharged through hose to ground.
When disk ruptures it will need to be replaced.
Fuel
Use clean fuel oil that is not contaminated with water
and debris. Replace fuel filter and drain tank every 100
hours of operation.
Use No.1 or No 2 Heating Oil (ASTM D306) only.
NEVER use gasoline in your burner fuel tank. Gasoline
is more combustible than fuel oil and could result in a
serious explosion.
NEVER
use crankcase or waste oil
in your burner. Fuel unit malfunction could result from
contamination.
CAUTION: If the fuel pump is allowed to run dry for
any length of time it will be damaged.
ATTENTION: Si la pompe à carburant fonctionne à
sec pendant un certain temps, elle s'endommagera.
Water hardness
(
2
dH)
5
10 15
20
25 30
Impulse transmitter
10
8
7
6.5
6
5.5
Karcher HDS 615-617 Operator’s Manual 9.800-103.0 - V
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