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(i)
Using the DHW and HEATING control thermostats switch the
boiler from HIGH to LOW and back several times to ensure
correct gas pressures. Replace the plastic cap
'C'.
9.
Position the Operating Switch to OFF, or, if a programmer is
fitted, set select button toOFF. Disconnect the pressure gauge
and retighten the test point screw. Test for gas soundness around
screw.
1 0. Check the operation of the flame failure device to ensure that
it will shut off the gas to the main burner within 60 seconds. To
do this, switch off the electricity supply at the mains and turn
off the gas supply at the gas cock. After 60 seconds, check for
the correct operation of the flame failure device by turning the
gas back on at the gas cock and attempting to re-light the pilot
without depressing the gas valve button. If the pilot can be lit
in this way, turn off the gas supply and contact Worcester Heat
Systems Ltd. Service Dept.
11 . Position the Operating Switch to HEATING
&
WATER or, if a
programmer is fitted, set select button to OFF. Re-light the
appliance and allow it to operate, venting as necessary.
NOTE: It will take about 15 minutes for the heat bank to be
satisfied before the central heating system will receive heat.
Check for water soundness.
Important: The complete appliance must be checked for water
leaks. Should any leaks be found they must be rectified before
proceeding further. Check for spillage from the down draught
diverter outlet at the right hand side of the appliance. Refer to
BS 5440, Part 2, 1978.
12. Position the Operating Switch to OFF, or, if a programmer is
fitted, set select button to OFF. Switch the electrical supply off
at mains. Turn the pilot gas off at the gas valve as described
in paragraph 5. While the water is still hot, drain the water at
the drain points on the appliance and in the system.
1 3. Refill the appliance and system (see Instruction
1)
and repeat
Instructions 2 and 3.
14. Light the pilot (see Instruction 5) and repeat Instruction 7.
15. Check for correct operation of the user controls including the
room thermostat (if fitted) and leave set to the customers
requirements.
16. Refit the cabinet front panel.
15. USERS INSTRUCTIONS
Hand the Users Operating Instructions to the user or purchaser for
retention and instruct in the efficient and safe operation of the
appliance and the heating and hot water system.
Advise the user or purchaser of the precautions necessary to pre-
vent damage to the heating and hot water system and to the
building in the event of the heating system remaining inoperative
during frost conditions.
Inform the user of the system pressure on a sealed system instal-
lation and advise them not to operate the unit if a significant drop
in pressure is observed on the pressure gauge indicating a loss of
water from the system.
Finally advise the user or purchaser that for continued efficient and
safe operation of the appliance it is important that adequate
servicing is carried out at intervals recommended by the Local Gas
Region_
Worcester Heat Systems Limited will be pleased to discuss and
offer a comprehensive maintenance contract.
Set the system controls to the users requirements.
15
16. ROUTINE CLEANING AND
INSPECTION
To ensure continued efficient operation of the appliance, it must
be checked and serviced as necessary at regular intervals. The
frequency of servicing will depend upon the particular installa-
tion conditions and usage, but in general, once per year should be
adequate. It is the law that any service work must be carried out
by a competent person such as British Gas or other Corgi
registered personnel.
1 . The following should be carried out at periods not
exceeding one year.
(a) Carry out a pre-service check noting any operational faults.
(b) Clean the burner.
(c) Clean the burner and pilot injectors.
(d) Inspect the heat exchanger and clean if necessary.
(e) Check the condition of the spark electrode and thermocouple.
(f)
Check the condition of the combustion chamber insulation.
(g) Check that the flue terminal is unobstructed and that the flue
system, including the flue canopy assembly, is sealed cor-
rectly.
(h) If the appliance has been installed in a compartment check
that the ventilation areas are clear.
(i)
Check that the pipe connections throughout the system
remain capable of sustaining a pressure of up to 3 bar. Remake
or replace any fittings which show evidence of water leakage.
SOME OF THE SERVICING POINTS ARE COVERED MORE FULLY IN
THE FOLLOWING INSTRUCTIONS.
2.
PRE-SERVICE CHECK
(a) Remove the cabinet front and top panels as described in
Section 12, paragraphs (a) and (b).
(b) Operate the appliance and system, noting any faults which
may need to be corrected during the service.
WARNING: Disconnect the electrical supply at the mains
before commencing any servicing. Turn off the gas at the gas
service cock. After completing any service work always test for
gas soundness and check the function of the controls.
Fig. 14.
Flue hood 'J' bolt fixings
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