Frank FEM 718 MSE-Z Operating Instructions Manual page 7

3.2.5 Level switch
The tabular radiators in the hot water tank are monitored by the level switch. In case of
lack of water the tabular radiators are switched off automatically. At hot water
operation – programme "HOT" – the level switch protects also the high pressure
pump, which is also automatically switched off in case of lack of water.
3.2.6 Regulating thermostat/heating switch
The thermostat has a regulating function.
Thermostat and heating switch form a unit. Both of them are actuated by a
thermostat spindle and the turning button.
By setting the desired temperature, the heating is switched on.
By turning back the turning button anticlockwise until the limit has been
reached, the heating is switched off.
3.2.7 Pressure switch
The machine is equipped with two identical pressure switches. One of them has the
safety function of a pressure switch. It switches off the machine in the event of the
spray gun being closed.
The second pressure switch starts the machine when the spray gun has been opened,
after the pressure has fallen to approx. 20 bar. The pressure cannot be regulated on
the pressure switches.
3.2.8 Pressure accumulator (pulsation damper)
The pressure accumulator dampens the pulsation of the high-pressure pump and
delays the restarting of the machine in the event of a leakage in the pressure system.
The filling pressure of the accumulator is 20 bar and must not fall below. Faulty
accumulators are to be replaced immediately.
3.2.9 Control cabinet
All electrical components are centrally installed in the control cabinet. A main and
emergency switch is installed in the front door and can be operated from outside
the cabinet.
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Pressure switches are safety devices. Replacement and repair
works may be done by experts only.
Maintenance and repair works may only be carried out by experts
with the main and emergency switch being switched off and
being protected against unintentional starting.