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Replace any components removed from the appliance in the
reverse order using new gaskets/O-rings/sealant where
necessary. Always check that any electrical connections are
correctly made and that all screws are tight.
Remove casing and cover panels and lower the facia, as
necessary, to gain access to the controls. Refer to Clause
14.3.1.1-7.
15.4.1.
Gas valve
Disconnect or unplug the electrical connections at the valve.
Remove the bottom panel. Unscrew the four flange screws at the
top and the union connection at the bottom manifold and
remove the assembly. Use the new O-rings provided when fitting
the new valve. Refer to Fig 40.
Set the gas valve:
1. Connect a pressure gauge to the burner pressure test point on
the gas valve. Refer to Fig. 40.
2. Switch on the gas and electrical supplies. Check for gas
tightness at the gas valve inlet.
3. Carefully pull off a connection from the Modureg adjuster on
the gas valve. Fully open a hot water tap. The burner will light
and operate at the minimum pressure.
4. Remove the cap from the Modulator.
5. Adjust the Modulator with a 3mm hexagonal key to give the
minimum pressure appropriate to the gas, clockwise to increase,
and counter-clockwise to decrease the pressure. 1.5 mbar for
natural gas (G20) or 6 mbar for propane (G31). Refer to Fig. 46.
6. Switch the appliance off. Refit the electrical connector to the
Modulator. With the hot water tap fully open, turn on the
appliance. The burner will light at the minimum pressure, and
then quickly increase to the maximum pressure. Adjust the
Modulator with a 2mm hexagon key to give the maximum
pressure appropriate to the gas, clockwise to increase and
counter-clockwise to decrease the pressure. 14.2 mbar for
natrural gas (G30) or 34.7 mbar for propane (G31).
NOTE:
if there is any difficulty in achieving these pressures then
check the inlet pressure at the gas valve. Refer to Section 9.3.
7. Turn off the hot water tap.
8. Replace the Modulator cap.
9. Run the appliance in each mode to check the setting
pressures. Central heating, 8.3mbar for natural gas (G20) or
19.2mbar for propane (G31). Refer to Section 15.4.11 if
necessary, to set the central heating pressure.
10. Switch off the appliance and disconnect the pressure gauge.
11. Relight the appliance and check for gas soundness.
15.4.2.
Spark Electrode
Remove the inner casing cover.
Carefully pull off the leads at the electrode assembly. Unscrew
the two screws and remove the spark electrode assembly from
the burner. Refer to Fig 43.
15.4.3.
Flame Sensing Electrode
Remove the inner casing cover.
Separate the electrode lead in-line connector. Release the locknut
on the support bracket and remove the sensing electrode from
the burner. Refer to Fig 44.
15.4.4.
Burner and Manifold
Remove the electrodes.
Remove the burner support brackets.
Remove the combustion chamber cover. Unscrew the two blade
assembly fixing screws and loosen the two locating screws. Lift
the blade assembly from the manifold. Remove the two
extended screws and lift out the manifold assembly. Do not omit
the O-ring when fitting the new burner. Refer to Fig 45.
15.4.5.
Combustion Chamber Insulation
Remove the combustion chamber cover.
Slide out the side insulation pads and then lift out the rear pad.
Fit new insulation pads in the reverse order. Remove and replace
the pad from the combustion chamber front cover. Refer to
Fig 47. To avoid the risk of fine particles dampen the pads before removal.
15.4 6.
Pressure Gauge
Drain the primary system. Refer to 15.3.1. Lower the facia and
unclip the gauge. Pull out the clip from the manifold and remove
the capillary. Refill and pressurise as described in Section 12.4-8 -
Commissioning. Refer to Fig 27 and 48.
15.4.7.
Relief valve
Drain the primary system. Refer to 15.3.1. Lower the facia.
Disconnect the relief valve drain pipe. Undo the union
connection and remove the relief valve. Refill and pressurise as
described in Section 11 - Commissioning. Refer to Fig 27.
15.4.8.
Flow Regulator
Drain the hot water circuit. Refer to 15.3.2. Lower the facia.
Remove the bottom panel.
Slacken the inlet water pipe at the manifold. Disconnect and
remove the flow switch. The flow regulator and its associated
plastic retaining collar are located in the outlet of the flow switch
body. Note the orientation of the regulator inside the flow switch
body, remove the regulator and collar. Ensure the new regulator
is correctly aligned and then insert the plastic collar. Ensure the
flow switch is refitted with the arrow pointing upwards.
Refer to Fig. 49.
21
Fig 46-Burner Pressure Adjuster (Modulator)
2
1
3
4
5
6
7
1. Modulator
2. Connections
3. Min/Max Pressure Adjuster
4. 2mm Hexagonal Key
(Maximum Pressure
Adjustment)
Fig 47-Combustion Chamber Insulation
1
2
3
4
3
1. Flue Hood Clamp Location Slots
2. Combustion Chamber Casing
3. Side Insulation Pads
4. Rear Insulation Pad
5. 3mm Hexagonal Key
(Minimum Pressure
Adjustment)
6. Modulator Cap
7. Burner Pressure Test Point
