2.30 INITIAL LIGHTING
OPERATING SEQUENCE
1. Check that the system has been lled and the boiler is
not air locked - air in the boiler could damage the heat
exchanger. For this reason the air vent located in the left top
side must never be shut off.
2. Check that all the drain cocks are closed and any valves in
the ow and return are open.
3. Check that the GAS SERVICE COCK IS ON.
4. Fill the condensate trap with water before putting the unit
into operation (see Section 3.7 for condensate trap removal).
5. Check the indication on the pressure gauge. If the pressure
is less than 1 bar the installation should be lled up rst
(sealed system only).
6. Switch the electricity supply ON and check that all the
external controls are calling for heat. Check boiler is set for
winter operation - see boiler user interface basic operating
instructions.
7. The boiler will commence the ignition sequence. If after 5
attempts the boiler has failed to light then it will lock out.
Press the reset button to restart the ignition sequence.
8. Operate the boiler for 10 minutes and check the gas
rate (Table 1). You should be able to read at least 90%
of the nominal. If this is not possible contact the boiler
manufacturer.
Flue CO
2
% measurements (hot condition)
30 40 60 80 100 120 150 30P 40P 60P 80P 100P 120P
Max Rate 9.76 10.2 9.4 9.3 9.4 9.6 9.4 10.9 11.2 11.4 11.4 10.8 11.2
Min Rate 8.56 8.6 8.6 8.7 8.6 9.0 8.5 10.3 9.7 10.2 10.8 10.1 10.1
Standby
yes
yes
yes
yes
no
no
no
no
no
noyes
yes
Heat demand on?
Temp. < setpoint?
Demand
off or Temp. >setpoint?
Heat Demand Off?
Fan off. Pump off
Flame detected?
Demand On
& Temp. <Set point & Anti-cycle
done?
Fan On
Fan Pre-purge
Pump On
Spark Generator On
Gas Valve On
3s Ignition Period
Burner Output controlled relative to
Heat Demand by varying Fan Speed
Burner On
Soft Start
Spark Generator Off
1st Stabilisation Period
Gas Valve Off
Pump Overrun
Standby
48
Installation & Servicing
SECTION 2 - INSTALLATION
INSTALLATION
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