Technical data

13
On reaching maximum temperature, the boiler
should be turned off and the system drained as
rapidly as possible whilst still hot.
• Refill system to a pressure of 1.5 bar and vent as
before.
• Restart boiler and operate until a maximum tem-
perature is reached. Shut down boiler and vent
heating system. If necessary, top up heating sys-
tem and make sure that a pressure of 1.5 bar
is indicated on the pressure gauge when system is
COLD.
Gas pressures
The main burner pressure should be checked dur-
ing commissioning to make sure the correct out-
put is obtained. Proceed as follows:
• Shut down boiler.
• Undo screw on burner pressure test point below
sealed combustion chamber and connect a
suitable manometer, see diagram 15.
• Start boiler as described in 'User Instructions'.
• Set boiler thermostat to maximum and check
that any external controls are calling for heat.
• Check that the reading on the gauge matches
that given in 'Technical Data' for the type of gas
being used.
• Adjust the range rating adjuster screw as neces-
sary to obtain the desired input, see diagram 16.
• Shut down boiler.
• Remove manometer, tighten up test point screws
and check for gas soundness.
• Using a ball point pen, clearly indicate on the
data label the input the boiler is set to.
Note: This adjustment does not affect the domes-
tic hot water output.
If measured burner pressure differs greatly from the
given figure, check the gas inlet pressure as follows:
• Shut down boiler.
• Remove screw from inlet test point on the side of
the gas valve, see diagram 14.
Des 044
Reg 056
• Connect a suitable pressure gauge.
• Start boiler as described in 'User Instructions'.
• Check that the inlet pressure reading matches
that given in 'Technical Data' for the type of gas
being used.
• Shut down boiler.
• Remove pressure gauge, tighten up test point
screws and check for gas soundness.
• If the gas pressure is incorrect, refer to the Fault
Finding section in 'Servicing Instructions'.
• If the inlet pressure is below that given, the gas
supply pipework/meter must be checked and any
fault corrected.
• In the case of an LPG installation, check the stor-
age tank or cylinder, regulator and pipework.
Diagram 15
Diagram 16
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.
In case of power supply failure
The boiler no longer operates.
As soon as power supply is restored, the boiler will
be automatically restarted.
Overheat safety
In the event of a problem, the overheat thermos-
tat causes safety shutdown of the boiler. Should this
occur, reset the thermostat by pressing the red
button. The overheat thermostat is located on the
RHS of the heat exchanger.
Important notice: A central heating system cannot
operate satisfactorily unless it is properly filled with
water and unless the air initially contained in the
piping systems has been properly bled off. If these
conditions are not satisfied, air noise will occur
within the system.
The COMBITEK F 23 E boiler has a built in frost pro-
tection device that protects the boiler from freez-
ing. If the boiler is to be left and there is a risk of
frost, ensure that the gas and electrical supplies are
left connected and the summer/winter switch is in
the position. The frost protection device will light
the boiler when the temperature of the boiler wa-
ter falls below 6°C. When the temperature reaches
16°C, the boiler stops.
Note: This device works irrespective of any room
thermostat setting and only protects the boiler.
ADJUSTMENTS
INSTALLATION INSTRUCTIONS