Supplied By www.heating spares.co Tel. 0161 620 6677
22
221504A
Diagram 10.4
GAS VALVE ADJUSTMENT
BLACK LEAD
MAIN BURNER
FLOW RATE
REGULATOR SCREW
PILOT BURNER
REGULATOR SCREW
3314
Diagram 10.3
Diagram 10.2
COMBUSTION CHAMBER
FLAME LENGTH
AND SPARK GAP
10 Commissioning
FLUE HOOD
WING NUTS
COMBUSTION
CHAMBER
FRONT PANEL
SECURING
SCREW (4)
12 to 14 FLAME LENGTH
SPARK GAP
3 to 4.5
Temporarily disconnect the black cable from the main solenoid
and insulate the connector with tape.
Remove the combustion chamber front panel, securing screws,
see diagram 10.2.
Switch on the electrical supply to the boiler and heating system.
Make sure that any remote controls are calling for heat.
WARNING. The gas valve, fan and control box operate on
mains voltage, terminals will become “Live”.
To complete this test it is necessary to operate the boiler without
its inner case, BUT UNDER ALL OTHER CIRCUMSTANCES
the inner case must be correctly fitted and sealed.
Turn the boiler thermostat knob fully clockwise and the fan will
operate. Sparks will be generated and the pilot burner will light.
Test for gas soundness around the pilot connections using
suitable leak detection fluid.
At this time check that the flame lengths are as shown in diagram
10.3.
The pilot gas rate is preset fully open and no adjustment should
be necessary, but, if required, turn the pilot burner regulator
screw on the gas valve, shown in diagram 10.4 clockwise, to
decrease.
Refer to diagram 10.3 for flame length.
Turn the thermostat knob to “O” and isolate the boiler from the
electrical supply.
Remove the insulation tape and reconnect the black cable
ensuring that the insulating boot is fitted to the main solenoid,
see diagram 10.4.
Refit the combustion chamber front panel, secure the fluehood
securing angle wing nuts and inner case with the screws
previously removed.
For reference attach the self adhesive arrow indicator, from the
fittings pack, to the data badge against the rating the boiler is
going to be set to.
Loosen the main burner pressure test point screw and fit a
suitable pressure gauge, see diagram 10.5.
WARNING. The gas valve, fan and control box operate on
MAINS voltage, terminals will become “Live”.
Note: The neon indicator lights on the control board (PCB) are
an aid to fault finding.
Make sure that any remote controls are calling for heat.
Switch on the electrical supply to the boiler and heating system.
Turn the boiler thermostat knob fully clockwise to the maximum
setting.
The lighting sequence is automatic, as follows:
The fan operates
The spark ignition operates
The pilot solenoid opens
The pilot burner lights
The ignition spark stops,
The main solenoid opens -
and after a short period of time the main burner will light, view
through window, see diagram 10.6.
The main burner will remain alight until switched off, either by the
boiler thermostat or a remote system control.
When the boiler switches “Off”, both the pilot and main burner go
out. The automatic lighting sequence will operate again when
heat is required.
3312
3345
To Next Page
Loading...
