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ADJUSTING AIR AND GAS FLOW RATES
3
2
1
Gas Filter (Fig. 31 - 1)
The gas filters remove the dust particles that are present in the gas, and prevent the elements at risk (e.g.: burners, counters and regu-
lators) from becoming rapidly blocked. The filter is normally installed upstream from all the control and on-off devices.
VPS504 Gas proving system (Fig. 31 - 3)
The VPS504 check the operation of the seal of the gas shut
off valves. This check is carried out as soon as the boiler
thermostat TAB gives a start signal to the burner, creating,
by means of the diaphragm pump inside it, a pressure in the
test space of 20 mbar higher than the supply pressure.
When wishing to monitor the test, install a pressure gauge
into the pressure supply point PA.
If the test cycle is satisfactory, after a few seconds the con-
sent light LC (yellow) comes on. Otherwise, the lockout light
LB (red) comes on.
To restart, it is necessary to reset the appliance by pressing
the pushbutton LB.
Servocontrol (Fig. 31- 5)
Two servocontrol models can be provided:
Berger STM30.. (see pag. 28) or
Siemens SQL33.. (see pag. 30).
CIB UNIGAS - M039177CA
4
5
Fig. 31
25
Keys
1
Gas filter
2
Gas proving system
3
Gas valves
4
Adjusting cam
5
Servocontrol
LC
LB
PA
Fig. 32
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