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The clock operation can be set by the selection switch, which has three positions:
1.
I (Up) position: The boiler is controlled by the function switch (3, Figure 18) and
operation is independent of the clock tappets.
2.
(Mid) position: The boiler is controlled by both function switch and clock tappets.
3.
(Down) position: The boiler is off independent of the function switch.
13.6 Service Mode Function: Turn the thermostat control knob 2 Figure 18 to minimum.
Turn selector control knob (4 Figure 18) from OFF to On (Heating Mode) three times each
within a two second interval. A wrench symbol will be displayed in the LCD window and the
boiler will ignite at minimum rate. The boiler is now in service mode and will stay there for
15mins, to obtain maximum rate simply turn the C/H control knob to max.
14. Commissioning
14.1 The boilers have been tested and pre-set at the factory and is dispatched with its on
board controls set to provide mid range central heating output. Consequently, once all
the connections have been made and the boiler has been fi lled with water to the designed
system operating pressure, the boiler may be fi red prior to adjusting it's on board controls to
suit the demand of the system.
14.2 Prior to fi ring, the condensate trap must be fi lled with water and plastic discharge
pipe connected to drain before operating the boiler, see section 10.9 for details, check that
the electrical supply to the boiler is 'On' (Indication is shown on the LCD display) and the gas
service cock is in the open position.
•
Set the boiler's central heating and domestic hot water temperature controls
to maximum by turning them fully clockwise.
•
Set the external room thermostat (if fi tted) to maximum and set thermostatic radiator
valves to maximum.
14.3 Switch the boilers function switch to the central heating and domestic hot water
position. The boiler's control unit will now automatically carry out pre-ignition safety checks
before igniting the burner.
14.4 On burner ignition check the integrity of the boiler's fl ue for tightness and correct
operation.
14.5 Check the boiler for correct domestic hot water operation by opening and closing
the household domestic hot water draw-off taps.
14.6 Restart the boiler and again allow the central heating system to reach maximum
operating temperature. Check that all the water connections throughout the system are
sound and bleed each of the heating systems radiators and purpose made air release points
in turn.
23
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