Safety Devices - Kärcher HWE 4000 Gas Manual Del Usuario

Safety Devices

Safety valve
– The safety valve protects the high pressure system against
excessive pressure.
– This valve is set and sealed in the factory. Do not change the
setting.
Safety switch for water scarcity
When the water supply is scarce, the flow switch switches off the
burner.
Water shortage safeguard
– When the water supply is scarce, the flow switch switches off
the burner.
– Accomodates the switching head during spray jet operations.
Switch head for spray jet operation (with upgrade kit
spray jet only)
– The flow switch (additional switching head) prevents the acti-
vation of large burner capacities during spray lance operation
(below 1,800 l/h) in order to avoid overheating.
– The burner stage 1 is released when there is function failure.
Safety temperature limiter
The safety temperature limiter switches off the burner when the
maximum permissible temperature is exceeded.
Safety valve "steam stage" (upgrade kit for steam
stage only)
– The safety valve "steam stage" protects the installation
against excessive pressure in the steam stage.
– This valve is set and sealed in the factory. Do not change the
setting.
Temperature stop for exhaust gases
The exhaust temperature limiter switches off the burner when the
maximum permissible exhaust temperature is exceeded.
Pressure monitor (upgrade kit for steam stage only)
– When there is a pressure shortfall (1.2 MPa), the pressure
guard switches the operating mode "Operate with steam"
over to "Operate using hot water".
– The operating mode "Operate with steam" is released only
when the minimum pressure (1.4 MPa) is reached.
Main switch
– A main switch that can be locked is to be installed at a safe
and easily accessible place to switch off the entire heating
unit.
– The main switch is to be switched off while carrying out any
repairs or maintenance jobs.
Pump module
If a pump module other than the HDI 38/12 is used, you must
check if this module has a pressure limitation (max. 1.6 MPa). If
this is not the case, you must install an additional safety valve (or-
der no. 6.412-271.0) at the input.
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EN 25