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SEQUENCE
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BOARD
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TO
TO
GAS VALVE GAS VALVE
MAIN
~LOT
Fig. 27. Electrical cable exits from control box.
"
12. Commissioning
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The appliance is dispatched with the controls set to pro·
vide a maximum output for domestic hot water of 24 kW
(82,000 Btu/h) and satisfy a central heating load of 16.1 kW
(54,900 Btu/h).
The controls can be reset to
incr~ase
the heat load capability to
24 kW (82,000 Btu/h). Refer to Section 12.4- Central Heating. It
is not necessary to set the output below 16.1 kW (54, 900
Btu/h) as it is automatically modulated to satisfy lower heat
loads.
Domestic Hot Water System. Check that the mains water sup·
ply has been fully flushed out at installation.
Central Heating System. Check that the central heating system
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.
12.2
APPLIANCE AND CENTRAL HEATING SYSTEM
PREPARATION
Remove the cabinet front panel.
Check that the electrical supply and the gas service to the appli-
ance are off. See Fig 3.
Check that all the water connections throughout the system are
tight.
Open the system valves at the appliance. See Fig 3. Open all the
radiator valves, fill the system and vent each radiator in turn.
On
sealed systems the automatic air vent, (fixed to the flow
manifold) will vent the appliance. Remove the boiler inner casing
cover to check that the air vent cap has been removed. See Figs
15 and 26. Replace the cover immediately.
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 access. Refer to Section 14.3(d).
SEALED SYSTEMS ONLY
Set the Expansion Vessel Pressure
The charge pressure of the expansion vessel as despatched is
0.5 ba1; which is
£:J~]Liival£:Jnt
to a static head of 5 metres
(17ft).
The charge pressure must not
be less
than the static head at the
point of connection. See Fig. 5. A Schraider type tyre valve is fit-
ted 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') and check for water soundness. Release water from the
TO
FAN
18
m
~
MAIN DRIVER BOARD
GJ
Earth MAINS
TO
TO
TO
TO
TO
TO
PUMP
PUMP
WATER
CENTRAL DOMEsnC GAS VALVE
OVER-RUN
DIVERTER
HEATING HOT WATER MODUREG
THERMOSTAT
VALVE
SENSOR.
SENSOR
REGULATOR
MICRO-SWITCH
TO ROOM THERMOSTAT -
'-TO FROST THERMOSTAT
IOPTIONALI
!OPTIONAL)
system using the relief valve test knob until the System Design
Pressure is obtained, up to a maximum of 1 .5 bar.
System Design Pressure in bar
=
Static Head of the System in
bar+ 0.3
Note: 1 bar is equivalent to 10,2 metres (33.5
ft)
of water.
Set the movable pointer
on
the pressure gauge to coincide with
the indicating pointer giving a permanent record of the set sys-
tem pressure.
If the pressure indicated
on
the pressure gauge is greater than
2.6 bar when operating at the maximum central heating tem-
perature, an extra expansion vessel must be fitted to the system
as close as possible to the appliance central heating return
con-
nection.
The appliance (as despatched) can accommodate a system vol-
ume of about 104 litres. Refer to BS 7074 Part
1. If
the system
volume is in excess of that accommodated by the expansion
vessel fitted to the appliance then an extra vessel must be fitted
as close as possible to the central heating return connection of
the appliance.
Any extra vessel fitted must be pressurised to the same figure as
the integral vessel. If the expansion vessel fails then the speci-
fied replacement must be fitted .
12.3 PROGRAMMER
Any programmer fitted
on
the appliance should be set up at this
stage following the instructions sent with the programmer. The
programmer will retain the settmg for up to four weeks following
an interruption in the electricty supply.
Fig. 28. Pressure relief valve.
Test knob
Pressure relief valve discharge pipe
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