24
face to face joint seals are correctly positioned and gas tight.
Re-commission the appliance as described in section 11
checking that all gas and water connections are sound.
8.
Circulating Pump.
Check that the electricity supply to the appliance is turned off.
Remove the cabinet front panel as described in Section 13.3
(a).
Drain the central heating circuit as described in Section 14.3
(a).
Lower the control chassis as described in 14.2.
Disconnect the pump electrical connection by unplugging the
cable from the main control assembly, located at the lower RH
side.
Undo the three union connections on the pump body, flow, return
and connection to the expansion vessel. Remove the pump by
withdrawing forwards and downwards.
Fit the replacement pump in the reverse order ensuring that the
face to face joint seals are correctly positioned and water tight.
Open the valves and fill and re-pressurise the system as
described in Section 11.2.
9.
Diverter Valve
Check that the electricity supply to the appliance is turned off.
Remove the cabinet front panel as described in Section 13.3
(a).
Drain the central heating circuit as described in Section 14.3
(a).
Drain the Domestic Hot Water circuit as described in Section
14.3 (b).
Lower the control chassis as described in 14.2.
Remove the Water Flow Regulator Valve as detailed in section
5 above.
Remove the Gas Control Valve as detailed in section 6 above.
Pull out the retaining clip from the small push-in pipe connection
located at the RH side of the valve body.
Disconnect the electrical connections from the spade terminals
on the valve solenoid.
Undo the four retaining screws holding the valve body to the
back plate which forms the three water connections.
Withdraw the valve from the rear and side water connections.
Fit the replacement valve in the reverse order ensuring that the
O rings in the rear of the valve body are correctly seated.
Following the replacement of all the associated parts open the
valves and fill and re-pressurise the system as described in
Section 11.2.
10.
Gas Solenoid Valve
Check that the gas and electricity supplies to the appliance are
turned off.
Remove the cabinet front panel as described in Section 13.3
(a).
Drain the central heating circuit as described in Section 14.3
(a).
Drain the Domestic Hot Water circuit as described in Section
14.3 (b).
Lower the control chassis as described in 14.2.
Remove the Water Flow Regulator Valve as detailed in section
6 above.
Remove the Gas Control Valve as detailed in section 7 above.
Remove the Diverter Valve as detailed in 9 above, then proceed
as follows
Undo the union connection at the top of the gas service isolating
valve.
Remove the two screws in the gas valve mounting flange which
hold the gas valve to the steel chassis of the boiler. Remove the
single fixing screw from the bracket, located approximately
midway up on the vertical gas inlet pipe and remove the gas
valve and inlet pipe as a unit.
Unplug the electrical connection from the valve solenoid.
Fit the replacement valve in the reverse order ensuring that the
face to face joint are located correctly.
Following the replacement of all the associated parts open the
valves and fill and re-pressurise the system as described in
Section 11.2.
11.
Water to Water Heat Exchanger
Check that the gas and electricity supplies to the appliance are
turned off.
Remove the cabinet front panel as described in Section 13.3
(a).
Drain the central heating circuit as described in Section 14.3
(a).
Drain the Domestic Hot Water circuit as described in Section
14.3 (b).
Lower the control chassis as described in 14.2.
Undo the four union connections at the rear of the unit and
remove.
Fit the replacement heat exchanger in the reverse order ensuring
that the face to face joints are located correctly and water tight.
Open the valves and fill and re-pressurise the system as
described in Section 11.2.
12.
Control Thermostat Sensor
The sensor is located in a pocket attached to the flow pipe from
the heat exchanger, to the left hand side of the gas valves.
Remove and replace the sensor as follows.
Remove the cabinet front panel as described in Section 13.3
(a).
Lower the control chassis as described in 14.2.
Pull off the electrical connections from the spade terminals,
spring off the retaining clip and withdraw the sensor from the
pocket.
Fit the replacement sensor in reverse order and apply heat sink
paste as necessary. Ensure the retaining clip is correctly
positioned.
13.
Gauze Filter
Remove the water flow regulating valve as described in section
6.
Pull out the retaining clip from the valve body and withdraw the
brass housing and filter.
Clean or replace the filter as required.
Reassemble in the reverse order.
14.
Injectors
Check that the electricity supply to the appliance is turned off.
Remove the front casing as detailed in section 13.3a.
Remove the burner assembly as described in section 13.3c.
Remove the burner manifold to expose the injectors. The
injectors can then be removed and replaced as required.
Assemble in reverse order.
15.
Ignition And Flame Sensing Electrodes.
Check that the electricity supply to the appliance is turned off.
Remove the front casing as detailed in section 13.3a.
Remove the burner assembly as described in section 13.3c.
Slacken the clamping screw and slide the Ignition electrode
assembly upwards from the clamp.
Replace in reverse order ensuring that the slots in the front
edge of the ceramic locate correctly on the burner front rail.
Remove the flame sensing electrode in a similar manner, again
ensuring when replacing that the locating grooves in the ceramic
locate on the burner front rail.
16.
Ignition Leads
Check that the electricity supply to the appliance is turned off.
Remove the front casing as detailed in section 13.3a.
Remove the control box cover by slackening the two retaining
screws and lifting clear.
Summary of Contents for 47 311 43
Page 11: ...11 Fig 7 System filling and make up ...
Page 27: ...27 Fig 27 ...
Page 30: ...30 19 Functional Flow Diagrams ...
Page 31: ...31 ...
