Commissioning The Appliance; Instructions To The User; Inspection And Service; Replacement Of Parts - Worcester WR325 RSF Installation And Servicing Instructions

11

Commissioning The Appliance

11.1 SUMMARY
Domestic Hot Water System. Check that the mains water supply
has been fully flushed out at installation.
Gas Service. The complete system, including the meter, must
be inspected and tested for soundness and purged as indicated
in BS 6891.
11.2 APPLIANCE PREPARATION
Remove the cabinet casing.
Check that the electrical supply and the gas supplies to the
appliance are off.
Check that all the water connections throughout the system are
tight.
11.3 APPLIANCE OPERATION
Turn off the gas and electricity supplies to the appliance.
Loosen the burner pressure test point screw, located on the
gas supply pipe to the burner manifold (pos. 1) and connect a
pressure gauge.
Turn on the gas and electricity supplies.
Turn on a hot water tap to create a demand for hot water.
A continuous ignition spark will occur until the burner is alight
and sensed by the control circuit. The burner pressure should
be 12,6 mbar for natural gas and 35 mbar for Propane.
If the burner pressure cannot be achieved then check that the
inlet pressure at the appliance is 20mbar for natural gas and
37mbar for propane.
If the appliance does not light, check that it is not in the 'lockout'
state by pressing the lockout reset LED button. See Fig. 20.
Check that fully heated water is available from the tap.
Gradually close the hot tap and check that the burner pressure
drops. Fully open the tap and check that the burner pressure
rises. Fully close the tap and check that the burner goes off.
The fan may continue running until the appliance has cooled to
a preset temperature.
11.4 COMPLETION OF COMMISSIONING
Disconnect the pressure gauge and tighten the test point screw.
Restart the appliance and check for gas soundness around the
test point screw.
Refit the cabinet casing.
If the appliance is being passed over to the user immediately,
refer to Section 12 - Instructions to the User and set the controls
to the users requirements.
If the appliance is to be left inoperative, check that the Operating
Switch is set to OFF. Turn off the gas service cock and switch
off the electricity supply.
If there is any possibility of the appliance and system being left
inoperative for long periods during frosty conditions, drain the
appliance and system.
12

Instructions To The User

12.1 Tell the user how to operate the appliance and hand over
the Users Instructions leaflet.
12.2 Tell the user what to do if the appliance is not to be used
in frosty weather.
12.3 Tell the user of the importance of regular servicing.
Worcester Heat Systems Ltd. offer a comprehensive
maintenance contract.
12.4 Set the controls to the user's requirements.
12.5 Refer to instructions on back page.
Supplied By www.heating spares.co Tel. 0161 620 6677

13 Inspection and Service

13.1 SERVICING
To ensure efficient operation of the heater it must be checked
and serviced as necessary at regular intervals.
The frequency of servicing will depend upon the particular
installation conditions and usage, but once per year should
generally 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.
13.3 PRE-SERVICE INSPECTION
Check that the flue terminal and terminal guard (if fitted) are
clear.
If the heater is in a compartment, check that the ventilation
openings if required in the compartment door or walls are clear.
See section 6-Air supply.
Check the all pipework and remake any joints or fittings which
show signs of leakage.
Operate the heater taking note of any faults.
IMPORTANT
Disconnect the electricity supply at the mains and turn off the
gas service cock before servicing.
13.3 DISMANTLE THE HEATER
To carry out a full and comprehensive service of the heater
remove the following parts to gain access to the components
which need to be checked or serviced.
(a) Cabinet casing
Remove the control knob and unscrew the bezel. Slide up the
upper facia section and remove the two screws. Pull forward
the lower casing and remove by unhooking at the top.
(b) Fan
Disconnect the electrical connections and unscrew the two
screws at the front. Remove the fan by pulling to the left. Inspect
and clean the impeller with a soft brush if necessary.
(c) Burner
Disconnect the electrodes and unscrew the union nut. Turn the
burner over inside the heat exchanger and remove from the
heater. Inspect and clean with a soap and water solution and a
soft brush if necessary.
(d) Heat exchanger
Remove the fan and burner as described above. Cover the
gas supply orifice. Inspect and clean the fins with a soft brush
if necessary.
14

Replacement of Parts

IMPORTANT
Switch off the electricity and gas supplies before replacing any
components. After the replacement of any components, check
for gas soundness where relevant and carry out functional
checks as described in section 11- Commissioning.
14.1 Fan
Check that the electricity supply is turned off. Remove the fan
as described in 13.3 (b). Fit the replacement fan in the reverse
order making sure it is correctly engaged into the seal.
14.2 Limit thermostat
Pull off the two connectors, unscrew the bracket and remove
the thermostat. Fit the replacement thermostat in the reverse
order making sure a good connection with the heat exchanger
is made.
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