19
SAFETY DEVICES
No gas supply
This will be indicated
on the display as a
pictogram of a spark.
To rectify this, pro-
ceed as follows:
Switch off the boiler at the On/
Off push button.
Rectify the gas supply problem.
Restart the boiler by pressing the
On/Off button.
--------------------------
Insufficient system pressure
This will be indicated
on the display as a
flashing warning indi-
cating the system
pressure is low.
To rectify this the system must be re-filled, refer to
'Commissioning'
.
--------------------------
Other faults
These are indicated on the display by a fault code
and a telephone symbol. Further information on the
fault codes can be found in the '
Servicing Instruc-
tions'.
General safety devices
Air flow rate safety device
If an obstruction, even partial, of the flue occurs,
for any reason whatsoever, the built in safety sys-
tem of the boiler will turn the boiler OFF and the
fan will continue to run.
The boiler will be ready to operate when the fault
has been cleared.
Overheat safety
In case of boiler overheating, the overheat ther-
mostat will turn the boiler off. The thermostat, lo-
cated on the heat exchanger flow pipe, will need
to be manually reset.
In case of power supply failure
The boiler no longer operates.
As soon as power supply is restored, the boiler will
be automatically restarted.
Frost protection
The
ISOMAX
has a built in frost protection device
that protects the boiler from freezing. If the boiler is
to be left and there is a risk of frost, ensure that the
gas and electrical supplies are left connected. The
frost protection device will light the boiler when the
temperature of the boiler water falls below 6
°
C.
When the temperature reaches 16
°
C, the boiler
stops.
Note :
This device works irrespective of any room
thermostat setting and will protect the complete
heating system.
➜
I
O
1
0.3
bar
Should it become necessary to change the gas
type, a modification kit will be required.
This modification must only be carried out by a
suitably qualified engineer.
Conversion natural Gas (G20) to G30/G31 Part No.
86216.
CHANGING GAS TYPE
