Kärcher HWE 4000 Gas Manual Download

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DANGER

Immediate danger that can cause severe injury or even death.

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WARNING

Possible hazardous situation that could lead to severe injury or
even death.

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CAUTION

Pointer to a possibly dangerous situation, which can lead to minor
injuries.

ATTENTION

Pointer to a possibly dangerous situation, which can lead to prop-
erty damage.

The hot water generator HWE 4000 is a ready-to-use preinstalled
once-through tankless water heater for stationary high-pressure
cleaning units with a top-fired fan burner for natural gas "H".

Note:

It is prohibited to use any other fuels!

The HWE 4000 is designed for three operating modes (also see
chapter "Function“):
– Pressure-side hot water generation for stationary nozzle sys-

tems (for e.g. internal cleaners).

– Generation of saturated steam for cleaning purposes (up-

grade kit for steam stage only).

– Pressure-side hot water generation for operating the spray jet

with reduced flow quantity (upgrade kit for spray jet operation
only).

Note:

There is an important connection between temperature,

pressure and flow quantity in the 3 operating types. It is prohibited
to use components or attachments other than those listed in the
operating instructions.
This basically concerns:
– All nozzles.
– Pump module and attachments.
– Burner and attachments.

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DANGER

Risk of injury! Follow the respective safety regulations when op-
erating at gas stations or other dangerous areas.

The plant drawing shows the appliance with a high pressure
pump module and all attachment sets connected in a series for a
specific purpose.
It is possible to operate in 3 modes through the physical relations
between pressure, flow quantity and temperature:
– Operating with hot water
– spray jet operation (with upgrade kit spray jet only)
– Steam operation (with upgrade kit for steam stage only)

(see system schematic)

When you start the appliance, the pump module (1) transports
the entire flow rate through the once-through boiler (2) to the noz-
zles (22) with the half load solenoid valve (16) being closed. The
burner ignites after approx. 10 seconds. By means of the temper-
ature controller (10) the water temperature is regulated to the set
desired value.

Features of this operating type:

– Flow rate: maximum

(at least 2000 l/h - With water volumes under 2000 l/h the
switching head 6.635-077.0 (9) must be used for safety rea-
sons.)

– Pressure: maximum
– Temperature range: up to 95 °C

(see system schematic)

After starting, the pump module (1) transports a lesser quantity
(on account of smaller nozzle opening) through the pass boiler
(2) to the spray jet (23). The burner ignites after approx. 10 sec-
onds. Due to a signal of the switching head (9) reduced power is
available, large burner capacities are disabled. Hence, the warm-
ing up phase is a little longer. If there is constant use, the temper-
ature also levels up at a constant value (physical balance).

Features of this operating type:

– Flow rate: minimum
– Pressure: maximum
– Temperature range: below 100 °C

(see system schematic)

After the start, the pump (1) transports 50% of the flow rate with
the half-load solenoid valve (16) being opened; 50% flow back to
the water inlet of the pump, through the once-through boiler (2) to
the steam nozzle (24) without pressure. The burner ignites after
approx. 10 seconds. The steam level is reached due to the tem-
perature controller (10).
The size of the steam nozzle is designed in such a way that the
steam jet lies between 1.2 MP and 2 MPa. This helps in fulfilling
2 important conditions:
– HWE 4000 is a fired pressure device of category III.
– No steam is generated in the piping system.

Features of this operating type:

– Flow rate: 50%
– Pressure: minimum
– Temperature: 140 °C

Danger or hazard levels

Proper use

Please do not let mineral oil contaminated waste water reach
soil, water or the sewage system. Perform engine cleaning and
bottom cleaning therefore only on specified places with an oil
trap.

Function

Operating with hot water

Spray jet operation (with upgrade kit spray jet only)

Steam operation (with upgrade kit for steam stage

only)