andrews SUPAflo EVO SF60 EVO, Installation And Service Manual

Page: 30 / 48

Commissioning
30
Check functionality of safety devices
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 temperature sen -
sor, water return temperature sen -
sor, fluegas temperature sensor and
ionisation electrode.
These devices can be checked as de -
scribed below.
Flow temperature sensor (1)
Disconnect the plug from the sensor
while the boiler is switched on. This
should result in a lockout no. 20.
The lockout should disappear as
soon as the plug is placed back in
position, the boiler will restart.
Return temperature sensor (2)
Disconnect the plug from the sensor
while the boiler is switched on. This
should result in a lockout no. 40.
The lockout should disappear as
soon as the plug is placed back in
position, the boiler will restart.
Flue gas temperature sensor (3)
Disconnect the plug from the sensor
while the boiler is switched on. This
should result in a lockout no. 28.
The lockout should disappear as
soon as the plug is placed back in
position, the boiler will restart.
4
2
4
Ionisation electrode (4)
Remove electrical connection from
the ionisation electrode while the
boiler is running, the boiler will go
in lockout no.
128. The boiler will try to restart.
With the electrical connection re -
moved, the restart will result in lock -
out no. 133.
When the connection is already
mounted, the restart will be suc -
cessful. Measuring the ionisation
current can be done by mounting a
multi-meter (set to μA) in between
the ionisation electrode and its elec -
trical connection.
1
2
1
3
The ionization current in normal
conditions will be between 4.4 -
10.6 μA
The minimum ionization current is:
• 1.51 μA (Type 150/200/300)
• 2.5 μA (Type 250)
• 3.2 μA (Type 400/500/570)