Worcester GREENSTAR 25Si Instruction Manual page 40

A
D
F
C
2
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 25Si/30Si
8 716 115 165a (06/2008)
1
J
I
E
H
G
B
INSPECTION AND SERVICE
Setting Boiler to Maximum.
NOTE: When running in the service mode, the
boiler will operate both the Central
Heating and DHW circuits. This is to
allow sufficient time for setting
procedure.
It will be necessary to run water through the
DHW circuit to ensure that the boiler will not
cycle on low heating demands.
A - On/off button
B - On/off and fault indicator (BLUE)
C - Central heating temperature control
D - Burner indicator (GREEN)
E - Reset button
F - Service button
G - DHW and pre-heat temperature
control
H - ECO button
I - System pressure gauge
J - Cover or optional programmer
1 Press and HOLD service button (F) for 10
seconds and set Central Heating temperature
to maximum.
• The service button will illuminate continually
and the blue power indicator will flash quickly.
• The boiler will stay in this mode for 15
minutes unless the service button is pressed
again.
2 Pull the cover off and connect a manometer
to the fan pressure test point.
After measurement replace test point cover.
Pressure will read negative and be greater
than:
Natural gas
25Si - 3.3 mbar 25Si - 3.7 mbar
30Si - 4.5 mbar 30Si - 5.2 mbar
• Pressures measured below these figures
will indicate that the heat exchanger will
require cleaning.
INSPECTION AND SERVICE
LPG
39