Worcester Greenstar 12i System Instruction Manual page 38

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INSPECTION AND SERVICE
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INSPECTION AND SERVICE
Setting B oller to M aximum.
NOTE: When running in the set'Vice mode, the
boiler wiD operate both the Central Heating and
OHW circuits. This is to allow sufficient time for
the setting procedure.
WHEN RUNN ING IN SERVICE MODE
NOTE: When fitted with the optional
diverter valve (not supplied) and
running in service mode, the boiler
will operate both central heating and
hot water circuits.
If fitted to an S or Y plan system, the
system must only be run In central
heating mode.
It will be necessiry to run
w;~~ter
through the
OHW circ.uit to ensure that the boiler will not
cycle on low heating demands.
A· On/off button
B · On/off and
fou~
indicator (BLUE)
C · Central heating temperature control
0 • Burner indicator (GREEN)
E • Reset button
F • Set'Vice button
G · Not used
H • System pres.&ure gauge
I· Cover or optional progtammer
1 Press and HOLD service button (F) for 10
&eoond&
and
&at
temperature to maximum.
The
S«Mvice
button wiU iUuminate continually
and the blue power indicator will flash quickty.
, The boiler
will
stay in
th~-s
mode for 15
t
mfnutes unless the service button is pressed
~
again.
~
2 Pull
the cover off and connect
a
manometer
1
to tha fan pressur& test point
I
~
Aft&r maasurement replace test poinl cover.
Pressure
wilt
read negative and be greater
than:
Natural gas
12i System - 3.1 mbat
24i System - 3.1 mbar
LPG
1 2i System - 4.9 mbar
24i System - 4.1 rrbar
Pressures measured below these figures
will indicate that the heat exchanger wilt
require cleaning, .
There is a special accessory kit available
specifically designed for cleaning the
heat exchanger.
tf
required Qfder
7 7 1 6 192 312.
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