Installation and operating instruction
Combustion manager W-FM 100 und W-FM 200
3 Product description
83054802 1/2018-07 La
13-228
3.2.3 Valve proving
The valve proving gas pressure switch checks if the valves are tight. It signals the
combustion manager if the pressure increases or decreases to an impermissible
level during valve proving.
Valve proving is carried out automatically by the combustion manager:
after every controlled shutdown,
prior to burner start following lockout or power outage.
1. Test phase (function sequence for valve proving valve 1):
Valve 1 remains closed, valve 2 opens,
the gas escapes and the pressure between valve 1 and valve 2 reduces,
valve 2 closes again,
both valves remain closed for 10 seconds.
If the pressure increases to above the value set during these 10 seconds, valve 1 is
leaking. The combustion manager initiates a controlled shutdown.
2. Test phase (function sequence for valve proving valve 2):
Valve 1 opens, valve 2 remains closed,
pressure between valve 1 and valve 2 increases,
valve 1 closes again,
both valves remain closed for 10 seconds.
If the pressure decreases to below the value set during these 10 seconds, valve 2
is leaking. The combustion manager initiates a controlled shutdown.
V1
V2
P
P
3 s
10 s
10 s
3 s
80
81
82
83
A
V1
V2
P
P
V1
V2
P
P
B
C
1
2
4
1
2
4
1
2
4
1
2
3
4
5
1
Valve 1
2
Valve 2
3
Pressure between valve 1 and valve 2
4
Valve proving gas pressure switch
5
Operating phases
A
Direct ignition
B
Ignition gas tube
C
Gas ignition device
