Balluff 17840010, Instruction Manual For Installation, Use And Maintenance

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“VPS 504” VALVE TIGHTNESS CONTROL (IF PRESENT)
It checks the tightness of gas cut-off valves.
This check is carried out as soon as the boiler thermostat authorises
burner operation creating, by means of a membrane pump, an over -
pressure greater than the upstream pressure by 20 mbar in the test
circuit.
If you wish to carry out a check, place a pressure gauge correspon -
ding to the PA pressure plug.
If the test circuit has a positive result, the LC authorisation lamp (yel-
low) switches on after a few seconds.
In order to restart, it is necessary to unlock the equipment using the
LB light button.
The fuse can be accessed using a screwdriver to remove the cover
that is located near the sockets for electrical connection; a spare fuse
is located in the upper part of the tightness control, under the cap.
ENGLISH
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