Commissioning
Check functionality of safety devices
Gas tightness check
Boiler shut down
26
Water flow temperature sensor (1)
Disconnect the plug from the sensor
while the boiler is switched on. This
should result in a lockout no. 12.
The lockout should disappear as soon
as the plug is placed back in position,
the boiler will restart.
Water flow switch (2)
Close (slowly!) the valve in the flow
connection to the system while the boi-
ler is running on minimum load.
When the valve is almost closed and
the water flow is insufficient, the water
flow switch will switch off and the
boiler will go in lockout 40. Open the
valve. A manual reset is necessary.
Minimum gas pressure switch (4)
Close the gas cock when the boiler is in
standby position (
K
). Open the test
point on the gas valve (3) while meas-
uring the gas pressure on the test point
of the gas pressure switch (5).
The boiler will go in lockout no. 2 when
the switch off setting is achieved. Close
both test points and open the gas cock.
Check functionality of safety devices
All safety devices have to be checked
on good functioning. Safety devices on
a standard boiler are a water flow tem-
perature sensor, water flow switch,
minimum gas pressure switch and ioni-
sation electrode. These devices can be
checked as described below.
Ionisation electrode (6)
Remove electrical connection from the
ionisation electrode while the boiler is
running, the boiler will go in lockout
no.5. The boiler will try to restart. With
the electrical connection removed, the
restart will result in lockout no. 4. When
the connection is already mounted, the
restart will be successful.
Measuring the ionisation current can
be done by mounting a multi-meter (set
to µA) in between the ionisation elec-
trode and its electrical connection. The
ionisation current should always be
above 1.2 µA, in normal conditions it
will be 6 µA and above.
Gas tightness check
Check the gas tightness of all sealed
connections with an approved soap or
electronic gas analyzer, for example:
Test points
Bolt connections
Gaskets of mixing system, etc.
Boiler shut down
When the boiler will not be used for
longer periods, shut down the boiler by
following procedure:
Switch the boiler in standby operation
(
K
)
Switch off the boiler with the on/off
switch (7)
Disable power supply to the boiler by
deactivating the mains isolator switch
in the boiler room
Close the gas supply to the boiler.
7
1 2
6
5
4
3
