Hamworthy Wessex 100 M100 Installation, Commissioning And Servicing Instructions page 29

noting the position for re-assembly. Check condition
of igniter assembly and probe for damage, clean as
required.
8) Check the burner and clean using a soft brush if
required (if possible use compressed air to blow out
the dust inside the burner tube).Alternatively the
burner tube can be washed using a soapy water
solution. Tap the burner flange firmly downwards on
a block of wood to dislodge any residual debris from
inside the burner tube. A damaged or cracked
burner should be replaced. (Fit the igniter and probe
to the burner flange to check the respective
positions - See Figure 14.1 p25).
9) Remove the pressure sensing pipes from the air
pressure switches noting the relative positions, blow
through the tubes to check that they are clear and
refit.
10) Check the position of the heat exchanger baffles
and springs using a mirror and torch by removing
the cleaning access door from the front panel below
the heat exchanger. Should the baffles and springs
need replaced, the heat exchanger assembly will
have to be removed as described in Section 13.3.1.
Re-assemble in reverse order checking for damage
to gaskets (replace if necessary) and renew the gas
pipe sealing washer (refer to Figure 14.5 p26).
Refer to Section 11, Commissioning and Testing
(p15), and test all gas joints broken or disturbed for
soundness before firing.
Carry out a combustion check by testing the flue gas
CO and CO levels as detailed.
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13.3 Two Year Service
Repeat the annual service as previously described
but do not refit any components to the heat
exchanger.
To clean the heat exchanger, the use of a high
pressure water hose (40-80 psi) is recommended.
Refer to Section 13.4.
13.3.1 Should a high pressure hose not be
available, the respective heat exchanger will have to
be isolated from the flow and return water pipework,
drained down and all fittings removed from the G1½
inlet nipples. Each module holds approximately 5
litres of water and weighs 60kg. It is recommended
that a minimum of two people are on hand to
remove the heat exchanger. Remove the securing
back nuts and withdraw the assembly by sliding it
out on the internal runners.
HAMWORTHY HEATING LTD
13.3.2 Take the module to a bench, unhook the
stainless steel springs and remove the 16 stainless
steel baffle plates to expose the finned tube bank.
Wire brush both sides of the baffles to remove any
deposits.
Thoroughly wire brush the finned tubes.
Re assemble in reverse order and refit heat
exchanger module (Renew the self adhesive sealing
strip around the casings heat exchanger mounting
hole, and the two sealing washers on the heat
exchanger nipples) Re connect system pipework
and check for soundness.
Re assemble the fan/swirler/burner assembly and
refit in reverse order. Test all gas joints broken or
disturbed for soundness before firing. Re-light
the boiler using instructions mounted on the top of
the control panel. Check and adjust, the low fire and
high fire gas pressures, refer to Figure 11.4.3 (p18)
for correct settings. If necessary, refer to Section
11.4, Commissioning The Boiler (p16), for correct
procedures.
13.4 Using the high pressure hose, insert the
cleaning nozzle into the opening in the centre of the
heat exchanger casting. Switch on the pump and
traverse the full length and circumference of the
heat exchanger to remove any deposits. All water
should discharge through the appliance drain.
Remove the cleaning access door from the front
panel below the heat exchanger and remove all
deposits.
Re assemble the fan/swirler/burner assembly and
refit in reverse order.
Test all gas joints broken or disturbed for
soundness before firing.
Re-light the boiler using instructions mounted on the
top of the control panel. Check and adjust, the low
fire/start gas and high fire gas pressures, refer to
Figure 11.4.3 (p18) for correct settings. If necessary,
refer to Section 11.4, Commissioning The Boiler
(p16) for correct procedures.
Note the gas pressure and exhaust gas readings
and compare with Figure 2.2 (p4) for Natural Gas or
Appendix 'A' (p30) for LPG Propane, adjust as
required. Ensure no gas leaks are evident from the
gas connections, see Figure 5.6 (p7) for procedure.
Check thermostat settings and adjust if required.
Re-fit door and tidy floor around boiler as necessary.
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WESSEX 100 M 500001080/F