HAMWORTHY HEATING LTD
WESSEX-HE 200 BOILER
500001008/K
17
13.4.7
Remove module baffles by unhooking the
stainless steel retaining springs. Brush the baffles
and tube bank assembly and continue service in
accordance with paragraphs 13.3.2 (c), (d) and (e).
(Two Year Service).
13.4.8
a) Remove the 12 x M12 bolts securing the front
header plate to the front tube plate and separate the
plates.
b) Remove the 18 x M12 bolts securing the rear cover
plate to the rear tube plate and separate the plates.
c) Clean and descale the internal surfaces of the
tubes and also the waterways in the tube plates and
covers. Chemical descaling is preferred for the tube
bank assembly, using suitable proprietary solutions.
Follow chemical manufacturer’s instructions for
solution strength, method of application, safety and
handling precautions.
13.4.9
Clean up mating surfaces and re-assemble
covers to tube plates with new gaskets lightly greased
before assembly. Torque the M12 bolts down evenly
to 81Nm.
13.4.10
a) Re-assemble baffles to module etc. in accordance
with procedure in paragraph 13.3.4.
b) Renew ceramic rope seal or silicon rubber self-
adhesive strip and replace module in casing by
reverse of either method (a) or (b) described in
paragraph 13.4.6.
c) If necessary replace boiler "in line" with its
associated pipework and reconnect flow and return
connections and flue duct, clean up flanges and
renew gaskets.
NOTE:
Fit flange bolts to flow and return elbows so
that nuts are uppermost on flow connection, and
underneath on return connection. This is important to
avoid controls cover fouling bolts.
13.4.11
a) Replace gas controls assembly, ensuring correct
orientation.
b) Reconnect main gas union to manual shut-off
valve.
13.4.12
Continue with re-assembly in accordance
with procedure for annual service: paragraphs 13.2.7
to 13.2.10.
