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7.8
REPLACEMENT OF PARTS
CAUTION: TURN OFF THE GAS SUPPLY AND ISOLATE
THE MAINS SUPPLIES BEFORE STARTING ANY WORK
AND OBSERVE ALL RELEVANT SAFETY PRECAUTIONS.
NOTICE: REPLACEMENT OF COMPONENTS.
▶ After replacement of any components always check
for gas tightness where relevant and carry out
functional checks as described in Commissioning.
Damaged O-rings or gaskets must be replaced.
7.8.1 REMOVING THE OUTER CASING
▶ Remove bottom tray by pressing the tabs (2) in, at the front underside
of the boiler.
▶ Lower the panel.
▶ Pull the panel forward, off the retaining ledge (1) at the back of the
boiler.
1.
2.
Fig. 66 Remove bottom panel
1. Undo the two screws securing the top of the boiler casing.
2. Undo the two screws securing the bottom of the boiler casing.
▶ Pull case forward and remove.
2.
Fig. 67 Remove outer case
Greenstar Ri
ErP
- 6 720 813 283 (2016/07)
1.
2.
6720644744-34.1Wo
7.8.2 PRIMARY SENSOR (CH NTC)
To gain access to the following components the outer
case has to be removed:
▶ Primary sensor
▶ Overheat thermostat
▶ Flue limit thermostat
Refer to figure 68 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.
▶ Coat new sensor with heat conductive paste and replace.
7.8.3 OVERHEAT THERMOSTAT
Refer to figure 68 for removal.
▶ Remove two electrical connectors from thermostat.
3. Slacken and remove fixing screw and thermostat (3).
▶ When replacing ensure thermostat sits correctly on surface of the
casting with the left hand side of thermostat sitting up against the
shoulder.
It is essential that the mating surface of the thermostat is
coated with heat conductive paste.
2.
1.
Fig. 68 Primary sensor and overheat thermostat
SERVICE AND SPARES
3.
41
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