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(h) Reconnect the piezo igniter lead to the electrode.
(i)
Check that all joints are tisht.
(j)
Replace the combustion chamber front plate.
(k) Brush any dust or deposits from the gas control and associated
pipework.
(I)
Reassemble the cabinet in the reverse order to its removal. Do
not fit the boiler inner casing cover, facia or the cabinet front
panel at this stage.
7.
TEST THE APPLIANCE AND INSTALLATION
(a) Turn on the gas at the gas service cock and reconnect the
electrical supply.
(b) Refer to the lighting instructions on the appliance front panel.
(c)
Carefully
light the boiler and check for gas soundness (includ·
ing the burner manifold connectiorr within the combusion
chamber) in accordance with BS 6891. It is necessary to
operate the boiler for a short period with the boiler inner cover
casing removed.
The action must be undertaken with great
care.
Turn off the boiler and replace the boiler inner casing
cover immediately after checking the gas soundness. Check
the main burner through the observation window.
(d) With the central heating off, check that the domestic hot water
operates correctly. When the priority thermostat is satisfied,
switch the central heating on and check that the water
diverting valve operates and supplies hot water to the central
heating circuit.
(e)
Set the Operating Switch (or programmer) to
OFF.
(f)
Loosen the burner pressure test point one turn and connect
a pressure gauge. See Fig. 24. Set the Operating Switch to
WATER & HEATING
(or programmer to
HW-24 hrs, CH-24
hrs).
Set the Hot Water Temperature Control Knob to off and
the Central Heating Temperature Control Knob to maximum.
If necessary, adjust the gas pressure at the governor on the
gas valve. See Section 14-Commissioning the Appliance.
(g) Set the Operating Switch to
WATER
(or programmer to
HW -
ON).
Set the Central Heating Temperature Control
Knob to off and the Hot Water Temperature Control Knob to
maximum. Check the burner pressure. See Technical Data,
Table 1 . Should the pressure require adjustment, contact
Worcester Heat Systems Service Dept.
(h) Set the controls to
OFF.
Disconnect the pressure gauge and
retighten the test point screw. Relight and test for gas
soundness around the test point screw.
(i)
Before leaving the site the service engineer should check that
no flammable material is left inside the appliance casing and
that the ventilation requirements remain at the required
17
Thermocouple
Burner fixing screws (2 off)
standard. See Section
7.
(j)
If the appliance is fitted in a cupboard check that the cupboard
ventilation remains adequate. See Section 6
(k)
Refit the facia, cabinet front panel and top panel.
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