Commissioning The Appliance - Worcester 24i RSF Installation And Servicing Instructions

12. Commissioning The Appliance

Benchmark Water Treatment: For optimum performance after
installation, this boiler and its associated central heating
system should be flushed in accordance with the guidelines
given in BS7593:1992 - Treatment of water in domestic hot
water systems. Full instructions are supplied with proprietary
cleansers sold for this purpose. If an inhibitor is to be used
after flushing, it should be used in accordance with the
inhibitor manufacturers instructions.
Suitable flushing agents and inhibitors are available from Betz
Dearborn Tel: 0151 4209563 and Fernox Tel: 01799 550811.
Instructions for use are supplied with these products.
12.1 SUMMARY
The appliance is dispatched with the controls set to provide a
maximum output for domestic hot water and central heating of
23.4 kW (80,000 Btu/h). The appliance automatically modulates
to satisfy lower heat loads.
Domestic Hot Water and Central Heating Systems. Check that
both the mains water supply and central heating systems have
been fully flushed out at installation.
Fig. 26. Appliance casing and control
equipment fixings.
Inner casing
cover
screws (4)
Bottom facia
panel fixing
screws (3)
Gas Service. The complete system, including the meter, must be
inspected and tested for soundness and purged as indicated in
BS 6891.
12.2 APPLIANCE AND CENTRAL HEATING
SYSTEM PREPARATION
Remove the cabinet front panel.
Check that the electrical supply and the gas service to the
appliance are off.
Check that all the water connections throughout the system are
tight.
Open the system valves at the appliance. Open all the radiator
valves, fill the system and vent each radiator in turn.
Remove the inner casing cover as described in section 14.3(b).
See Fig 26.
The automatic air vent will vent the appliance. Check that the air
vent cap has been removed. See Fig. 27.
Check that the pressure relief valve operates by turning the knob
anti-clockwise until it releases. Water should be expelled from
the discharge pipe. See Fig. 28. Lower the control box to gain
Supplied By www.heating spares.co Tel. 0161 620 6677
Fig. 27. Appliance components and fixings
(upper assembly).
Overheat
thermostat
Combustion
chamber
cover fixing
clips (2)
access. Refer to Section 14.3(c).
Set the Expansion Vessel Pressure
The charge pressure of the expansion vessel as dispatched is 0.5 bar,
Side casing
which is equivalent to a static head of 5 metres (17ft). The charge
fixing
pressure must not be less than the static head at the point of
screws (4)
connection. A Schraeder type tyre valve is fitted to the expansion
vessel to allow the charge pressure to be increased if necessary.
Set the System Pressure
Fill the system until the pressure gauge shows 2.5 bar (37
lb/ins 2 ) and check for water soundness. Release water from the
system using the relief valve test knob until the initial System
Design Pressure is obtained, up to a maximum of 1.5 bar.
Initial System Design Pressure (bar) = Expansion Vessel Charge
Pressure +0.3 (bar).
Facia panel
Note: 1 bar is equivalent to 10.2 metres (33.5 ft) of water.
fixing
Set the movable pointer on the pressure gauge to coincide with
screws (2)
the indicating pointer giving a permanent record of the set
system pressure.
Fig. 28. Pressure relief valve.
Pressure relief
valve.
(Turn knob
anti-clockwise
to test).
16
Flue Gas
Flue hood
Test Point
Burner fixing
screws (2)
Fan assembly
fixing screws (4)
Auto air
vent