Worcester 440CDi Instruction Manual page 41

IMPORTANT: AFTER COMPLETING THE APPLIANCE SERVICE THE CO/CO
CHECKED AND SET TO THE LIMITS IN THE SECTION "AIR/GAS RATIO".
3
4
INSTALLATION & SERVICING INSTRUCTIONS
8 716 115 219b (09.2008)
MUST BE
2
2
D
C
B
INSPECTION & SERVICE
Primary Heat Exchanger:
There is a special accessory kit available (No.
840) specifically designed for cleaning the heat
exchanger. If required order 7 719 001 996.
1 Pull the cover off (A) and connect a
manometer to the fan pressure test point.
After measurement replace test point
cover.
Pressure will read negative and be greater
than:
440CDi - 4.1 mbar
550CDi - 5.2 mbar
Pressures measured less than these figures
will indicate that the heat exchanger will
require cleaning.
2 Remove the cleaning access cover (B),
seal (C) and metal plate (D) securing it, if
present.
3 Unscrew the condensation trap cap and
place a suitable container underneath.
To Remove Condensate pump:
Disengage condensate pipe from
condensate pump.
Remove condensate pump from base
panel.
After servicing the heat exchanger, fill
the condensate trap with approximately
1/4 litre of water and refit in reverse order.
To Clean the Heat Exchanger:
4 A Loosen any deposits in the heat
exchanger from top to bottom using the
cleaning blade.
Clean the heat exchanger from top to
bottom using the brush.
Refit the clean out coverplates in reverse
order using a new seal (C) and tighten
screws to a torque of approximately 5 Nm.
After re-assembly check CO/CO
as described in the section "Setting the
air/gas ratio".
INSPECTION & SERVICE
levels
2
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