INSPECTION AND SERVICE
Primary Heat Exchanger
There is a special accessory kit availble
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:
NG LPG
12kW - 3.6 mbar - 3.9 mbar
15kW - 5.5 mbar - 5.8 mbar
18kW - 7.4 mbar - 8.0 mbar
24kW - 3.1 mbar - 4.1 mbar
Pressures measured below these figures
will indicate that the heat exchanger will
require cleaning
Setting Boiler to Maximum.
1 Remove the three screws (A) retaining the
control cover.
Clipped inside the cover is a plastic tool
used to change the mode switch setting
(B).
2 Using the tool set the mode switch to
maximum.
The power indicator will flash and the boiler
will stay in this mode for 15 minutes if no
further change is made to the switch.
3 Pull cover off and connect manometer to
the fan pressure test point.
Pressure will read negative and be greater
than:
NG LPG
12kW - 3.6 mbar - 3.9 mbar
15kW - 5.5 mbar - 5.8 mbar
18kW - 7.4 mbar - 8.0 mbar
24kW - 3.1 mbar - 4.1 mbar
After measurement replace test point cover
and return mode switch to normal.
Replace controls cover.
1
A
B
B
2
3
INSPECTION AND SERVICE
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER BOSCH GREENSTAR Ri
8 716 109 699a (05/05)
34
SERVICING
& SPARES
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