Worcester Greenstar Ri Manuel de service télécharger pdf (Page 48)

SERVICE AND SPARES

6 720 644 744b (2011/08)

6.8.2 PRIMARY SENSOR (CH NTC)

Refer to figure 74 for removal.

1. Remove electrical connection by pulling upwards.

Squeeze retaining clip on plastic moulding of sensor

and pull back and up until clear of pocket in heat

exchanger.

2. Pull forward to remove completely.

B Coat new sensor with heat conductive paste and

replace.

6.8.3 OVERHEAT THERMOSTAT

Refer to figure 74 for removal.

B Remove two electrical connectors from thermostat.

3. Slacken and remove fixing screw and thermostat (3).

B When replacing ensure thermostat sits correctly on

surface of the casting with the left hand side of

thermostat sitting up against the shoulder.

Fig. 74 Primary sensor and overheat thermostat

6.8.4 FLUE OVERHEAT THERMOSTAT

(WITH GROMMET)

To remove and replace the thermostat either:

B Using a small terminal screwdriver, prise the

thermostat and grommet from the plastic housing.

Take care not to damage the plastic housing.

-or-

1. Release the flue connection from the sump.

2. Push the flue tube up.

Fig. 75 Lower exhaust section

B Remove electrical connections.

1. Push the flue limit thermostat in from the sump.

B Retrieve the thermostat from the sump well.

Fig. 76 Remove thermostat

To replace, push the thermostat and new grommet

gently back into the opening until contact with the

locating ridge is felt.

To gain access to the following components

the outer case has to be removed:

B Primary sensor

B Overheat thermostat

B Flue limit thermostat

It is essential that the mating surface of the

thermostat is coated with heat conductive

paste.

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Worcester Greenstar Ri Manuel de service Page 48

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