Worcester GreenStart 25Si Instruction Manual page 37

1.
A
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 25Si/30Si
8 716 107 337b (11/05)
1.1
B
2.1
C
2.2
INSPECTION AND SERVICE
1.2
Component Access
1. Removing outer case
1.
Remove bottom panel by pulling it forward
and off.
1.1 Undo and remove 2 screws (A) securing
boiler casing at the top of the appliance.
1.2 Undo but do not remove the 2 screws
(B) securing boiler casing at the bottom of
the appliance.
1.3
1.3 Pull case forward and remove.
2. Adjusting boiler control to
service position
2.1 Remove screw (C) securing control.
2.2 Gently pull forward until it comes to
rest in service position.
Primary Heat Exchanger
There is a special accessory kit available
specifically designed for cleaning the
heat exchanger. If required order
7 716 192 312.
3 Check fan pressure at the test point next to
the fan using an electronic manometer
The boiler must be run at maximum output.
Pressure will read negative and be greater
than:
Natural gas
25Si - 3.3 mbar
30Si - 4.5 mbar
Pressures measured below these figures
will indicate that the heat exchanger will
require cleaning
INSPECTION AND SERVICE
LPG
25Si - 3.7 mbar
30Si - 5.2 mbar
36
3