Replacement Of Parts 41 ·51 - Worcester Greenstar 12i System Instruction Manual

CAUTION: TURN OFF THE GAS SUPPLY AND ISOLATE THE MAINS
SU PPLIES B EFORE STAR TING A NY WO RK AND OBSERVE ALL
RELEVANT SAFETY PR ECAUTIONS.
IMPORTANT: AFTER REPLACEMENT OF ANY COMPONENTS ALWAYS
CHECK FOR GAS SOUNDNESS WHERE RELEVANT AND CARRY OUT
FUNCTIONAL CHECKS AS DESCRIBED IN COMMISSIONING.
ANY O·RING OR GASKET THAT APPEARS DAMAGED MUST BE
REPLACED.
REPLACEMENT OF PARTS
1.1
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1.2
3
REPLACEMENT OF PARTS
1. Removing outer case
1.1
uooo
4 SC(tmoS (A)
securing boiler casing.
1.2 Pull
case
forwatd aoo remove.
,. To remove bottom tray, pull forward on the
tag
on the underside o f the bay.
The following components can be
r eplaced with the outer case
removed:
Primary sensor
Overheat thermostat
Flue l imit thermostat
2.
Primary sensor
,. Remove electrical oonnection (B) by pulliog
vpvtetrds. Squeeze retaining clip on plastic
mou!di1'9 (C) and pull sensor (D) upwards
until
cleat
of pocket in heat exchanger.
• Coat new sensor vlith heat conductive
paste aoo replace.
3. Overheat thermostat
,. Remove two electrical connectors from
thermostat
,. Slacken and remove fixing screw and
thermostat
,. When rep1ad.ng ensure thermostat sits
correctly on surface of the casting \vith the
left hand side
of tt\e(mostat siting up
against the shoulder.
NOTE:
It is essential that the mating surtace
of
the
thermostat is coated
with heat
conductive paste.
4. Flue overheat thermostat
4.1 Type A (se<ew in
ty~)
• Ren"K)ve electrical connections.
• Unscrew thermostat from flue.
4.2 Type B (with grommet)
• Remove electrical connections.
,. Undo
the flue connection
from
the sump
aoo
push
the
flue
tube
up.
• Push the flue limit thermostat outwards
ffom the sump.