Worcester 24CDi Скачать руководство пользователя страница 24

Страница: 24 / 40

12. Central Heating Sensor.

Refer to Fig. 34.

Remove the inner casing cover as described in Section 15.3, b.
Check that the electricity supply to the appliance is turned off.
Carefully pull off the two leads from the sensor.
Pull off the sensor and spring retaining clip from the pipe.
Fit the replacement sensor in reverse order with a layer of heat
sink compound between the faces. Refit the leads.

13. Domestic Hot Water Sensor.

Refer to Fig. 39.

Check that the electricity supply to the appliance is turned off.
Hinge the facia panel into the servicing position as described in
Section 15.3, c.
Carefully pull off the two leads from the sensor.
Undo and remove the screw, pull off the sensor and spring
retaining clip from the pipe.
Fit the replacement sensor in the reverse order ensuring a layer
of heat sink compound is between the faces. Refit the leads.

14. Circulating Pump.

Refer to Fig. 37.

Check that the electricity supply to the appliance is turned off.
Drain the central heating circuit as described in Section 16.3, a.
Hinge the facia panel into the servicing position as described in
Section 15.3, c.
Undo the two union nuts and the pipe to the expansion vessel,
remove the pump from the pipe-work. Support the pump and
remove the electrical cover.
Disconnect the electrical wires taking note of their positions.
Fit the replacement pump in the reverse order using new sealing
washers.

Alternatively

replace the pump head only by removing the four

Allen screws on the pump, remove the head and support whilst
removing the electrical connections. Refit the new head.
Open the valves and fill and re-pressurise the system as
described in Section 13.2.

NOTE:

The direction of flow should be downwards. The speed

should always be set to maximum.

15. Pressure Relief Valve.

Refer to Fig. 36.

Drain the central heating circuit as described in Section 16.3, a.
Hinge down the facia panel as described in Section 15.3, c.
Remove the bottom panel as described in Section 15.3, d.
Pull  out  the  retaining  clip  and  remove  the  pressure  gauge
connection. Undo the discharge pipe connection and remove the
valve taking care not to distort the pipework.
Fit  the  replacement  valve  in  reverse  order.  Reconnect  the
discharge pipe.
Open  the  valves  and  fill  and  re-pressurise  the  system  as
described in Section 13.2.

16. Expansion Vessel.

Refer to Fig. 38.

Drain the central heating circuit as described in Section 16.3, a.
Hinge the facia panel into the servicing position as described in
Section 15.3, c.
Remove the air pressure switch, gas to water heat exchanger,
water to water heat exchanger and pump as described in 16.4, 2, 5,
14 and 20 and remove the vessel.
Fit the replacement vessel in the reverse order.
Open the valves and fill and re-pressurise the system as
described in Section 13.2

17. Water Diverting Valve Micro Switch Assembly.

Refer to Fig.39.
Check that the electricity supply to the appliance is turned off.
Hinge down the facia panel as described in Section 15.3, c.
Remove the bottom panel as described in Section 15.3, d.
Using  a  pair  of  fine  nosed  pliers,  pull  the  circlip  off  and  remove
the  micro  switch  assembly  from  the  valve.  Remove  the  black
cover  and  carefully  pull  off  the  connections  from  the  terminals
on the micro switches.
Withdraw the switch assembly from the appliance.
Fit the replacement micro switch assembly in the reverse order.

Fig. 37. Circulating pump

Expansion vessel

Unscrew union fittings

Allen screws (4)
remove if changing
pump head only

Pump head

Pump

Electrical
connection
cover

Unscrew union
fitting

Fig. 38. Expansion Vessel

Strap

Cut

Support bar