Cuenod C 285 Operating Instructions Manual page 13

Start-up
Description of adjustments
Gas valve / leakage controller
1 Wieland 7P socket
3 Filter element
4 O-ring Ø 10.5 x 2.25
5 Fuse Y 6.3 250V Ø 5 x 20
6 Yellow indicator On :
Leakage test validated
7 Red indicator On :
Leakage test not validated,
manual release
8 Spare fuses magazine
9 pa (p2) pressure take- off Ø 9.
Test pressure : pe + 20mbar
10 Pressure take- off : pe (p1) Ø 9.
Inlet pressure (distribution)
05/2008 - Art. Nr. 13 013 503D
Leakage controller VPS 504 SO2
Optional for C 280, C 285
Operating principle :
Prior to each start-up of burner, the
control unit shall check subsequently for
leaks between safety and main valves
by increasing the distribution pressure.
Electrically, the leakage controller gets
connected serially between the
thermostatic circuit and the control and
safety unit of the burner.
Installation :
Directly on valve.
Program development :
At shutdown, safety and main valves are
closed.
At thermostatic shutdown, the leakage
controller is powered up and the booster
increases distribution pressure by
20mbar.
After no more than 30 seconds of
operation :
- If leakage test is validated, the yellow
light comes on and power is released
to feed the control and safety unit,
which starts its cycle.
- If leakage test is not validated, the red
light comes on and the control and
safety unit is not powered up.
- Control cycles need to be restarted
manually. If fault persists, valve
should be changed.
Adjustment :
The leakage controller requires no on-
site adjustment.
Operating test :
While leakage controller is working :
• Open pressure take-off pa. The
leakage so generated prevents the
super pressure from building up, and
the safety unit locks on after
30 seconds.
• Close pressure take-off pa.
• Release controller safety by pressing
the red indicator light.
The leakage controller restarts and, after
30 seconds, the yellow indicator lights
up and powers up the control and safety
unit, which begins its cycle.
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