Replacement Of Parts - Worcester GreenStart 25Si Instruction Manual

CAUTION: TURN OFF THE GAS SUPPLY AND ISOLATE THE MAINS
S U P P LI E S B E FOR E STARTI NG ANY WOR K AN D OB S E RVE ALL
RELEVANT SAFETY PRECAUTIONS.
IMPORTANT: AFTER REPLACEMENT OF ANY COMPONENTS ALWAYS
CHECK FOR GAS SOUNDNESS WHERE RELEVANT AND CARRY OUT
FUNCTIONAL CHECKS AS DESCRIBED IN COMMISSIONING.
ANY O -R I NG OR GAS KET THAT APPEARS DAMAG E D M UST B E
REPLACED.
A
41

REPLACEMENT OF PARTS

1.1
A
B
C
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 25Si/30Si
REPLACEMENT OF PARTS
1. Removing outer case
1.1 Undo 4 screws (A) securing boiler casing.
1.2 Pull case forward and remove.
tag on the underside of the tray.
The following components can be
replaced with the outer case
removed:
Primary sensor
1.2
Overheat thermostat
Flue limit thermostat
2. Primary sensor
3. Overheat thermostat
2
D
NOTE: It is essential that the mating surface of
the thermostat is coated with heat conductive paste.
4. Flue overheat thermostat
3
4
To remove bottom tray, pull forward on the
Remove electrical connection (B) by pulling
upwards. Squeeze retaining clip on plastic
moulding (C) and pull sensor (D) upwards
until clear of pocket in heat exchanger.
Coat new sensor with heat conductive
paste and replace.
Remove two electrical connectors from
thermostat.
Slacken and remove fixing screw and
thermostat.
When replacing ensure thermostat sits
correctly on surface of the casting with the
left hand side of thermostat siting up
against the shoulder.
Remove electrical connections.
Unscrew thermostat from flue.
8 716 107 337b (11/05)