23
221873B
10 Commissioning
If the maximum pressure cannot be obtained, check that the gas
supply of adequate size, refer to Section 1.7.
10.5 Gas Rate Modulation
The burner pressures are factory preset and no adjustment
should be required.
When checked if they are not consistant with the information in
table 1. the following steps should be taken.
Fully open a domestic hot water tap ensure there is no modulation.
Turn the domestic burner pressure potentiometer to minimum
by turnining anticlockwise with the tool supplied (do not force it),
see diagram 10.2.
Carefully turn the minimum stop screw on the gas control valve.
When the correct setting is achieved adjust the potentiometer on
the control board (PCB) until the maximum is achieved. If it is
not possible to abtain the maximum required turn the
potentiometer fully clockwise (do not force it). Removing the
cover screw on the main gas control valve and turn the adjustment
screw until a pressure of 1mbar above the maximum stated in
table 1. is achieved. Refit the cover and adjust the potentiometer
to give the stated maximum setting by turning below the setting,
then slowly increasing upwards.
10.6 Domestic Water Flow Rate
This is factory preset and can not be adjusted.
10.7 Burner Pressure - Heating
The burner pressure is factory preset and no adjustment should
be required.
Check that all remote heating system controls, room thermostats,
integral clock and the like are switched on/programmed and
calling for heat.
Refer to diagram 3 Instructions for Use. Set button “J” to “K”
winter, see diagram 3.
The pump will circulate water through the boiler and the main
burner will light.
Check that the burner pressure, with the heating system cold to
prevent any modulation of the gas pressure, is /-0.2mbar
of 14.3mbar, the central heating pressure.
If the burner pressure is incorrect, it may be adjusted to the
correct setting by turning the central heating gas pressure
adjuster (potentiometer), located on the control board to gain
access remove the two screws securing the controls facia.
Hinge the control facia forward.
Remove the plastic plugs. Using the burner adjusting tool
supplied. (clockwise to increase), see diagram 10.2. Turn the
adjuster slowly, always making adjustment by reducing below
the required pressure then increasing up to the required setting.
Diagram 10.3
7235
SECURING SCREWS
CUTOUT
CASE
BASE
CUTOUT
Diagram 10.4
7021
SIDE
PANEL
SECURING
SCREW (2)
SECURING SCREW (2)
10.8 Ignition Rate
Set the mains electrical switch “B” to 0, located on the controls
fascia, see diagram 3. (Instructions for Use).
Disconnect the sensing lead at the connection, see diagram
10.2.
Set the mains electrical switch “B” to 1. The electrode will
continue to spark for (10 seconds approx.) to enable the ignition
to be set and checked before going to lockout. Check the
ignition rate is set to 6.0 mbar +/-1.0 mbar, adjust if required by
turning the ignition rate setting potentiometer using the
adjustment tool supplied, If this is not achieved before the boiler
goes to lockout the process can be repeated as required by
pressing the rest button “G”, see diagram 3. (Instructions for
Use). When set, switch the mains electrical switch “B” to 0.
Reconnect the sensing lead.
Set mains electrical switch “B” to 1, depress the rest button “G”
if required. Check the appliance operates correctly.
Isolate the boiler from the electrical supply.
Replace plastic plugs, screw cap and adjusting tool.
Disconnect the pressure gauge, tighten the burner pressure
test point screw . Test for gas soundness. Take care not to
splash any of electrical components.
Refit control fascia.
