19
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 15,5 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. 26.
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.
Central Heating
The appliance is dispatched with the controls set to provide a
maximum output for Central Heating of 14 kW.
Check that all the radiator valves are open.
Set the CH temperature control knob to MAXIMUM and check
that the boiler is switched on.
A continuous ignition spark will occur until the burner is alight
and sensed by the control circuit. The burner pressure should
be 5,7 mbar for natural gas and 14,2 mbar for propane.
Set the room thermostat and the Central Heating Temperature
Control to maximum.
On sealed systems check that the system is pressurised and
set to the required pressure as indicated on the gauge.
Check the system to ensure that all the radiators are heating up
evenly.
Balance the system so that the required temperature difference
across the central heating flow and return pipes is obtained.
Set the room thermostat, if fitted, to minimum and check that
the burner goes out. Reset the room thermostat to maximum
and the burner will re-light and follow the normal operating
procedure.
Check for proper ignition of the burner after a break in the gas
supply. Turn off the gas service cock and wait for 60 seconds.
The burner will go out but sparking from the electrode will
continue for 10 seconds when the appliance will enter a lockout
state. Carefully open the gas service cock, press the lockout
reset button and observe the burner re-light and follow the
normal sequence of operation.
Set the Operating Switch to OFF.
Turn off the gas service cock and the electrical supply to the
appliance.
Drain the system while the appliance is still hot.
Refill, vent and, with a sealed system, re-pressurise as described
in Section 11.2.
Domestic Hot Water and Central Heating
Turn on the electricity supply to the appliance and open the gas
supply cock at the appliance.
Set the Operating Switch (and Programmer) to HEATING &
WATER. If a programmer is fitted set the domestic hot water to
Continuous or 24 Hrs and the central heating to ON. Open a
tap, the burner will light and heat will pass into the system hot
water is discharged. Close the tap and the burner will go off.
The appliance will then return to the central heating mode and
automatically balance with the system requirements.
Set the Operating Switch to OFF and the burner will go out.
11.5 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.
11
Commissioning The Appliance
11.1 SUMMARY
Domestic Hot Water System. Check that the mains water supply
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.
11.2 APPLIANCE AND CENTRAL HEATING SYSTEM -
PREPARATION
Remove the cabinet casing and lower the control assembly
chassis, if necessary.
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.
Open the system valves at the appliance. Open all the radiator
valves, fill the system and vent each radiator in turn.
The automatic air vent positioned on the expansion tank at the
top rear of the appliance will vent the appliance. Check that the
air vent cap has been loosened. See Fig. 1.
Check that the pressure relief valve, located at the lower RH
corner of the appliance, operates by turning the knob anti-
clockwise until it releases. Water should be expelled from the
discharge pipe.
Set the Expansion Vessel Pressure
The charge pressure of the expansion vessel as dispatched is
0.5 bar, which is equivalent to a static head of 5 metres (17 ft).
The charge pressure must not be less than the static head at
the point of connection. See Fig. 7. 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/
in
2
) and check for water soundness. Release water from the
system using the relief valve test knob until the system design
pressure is obtained, up to a maximum of 1.5 bar.
Initial system design pressure (bar) = Expansion vessel charge
pr 0.3 bar.
NOTE: 1 bar is equivalent to 10.2 metres (33.5ft) of water.
If the pressure indicated on the pressure gauge is greater than
2.6 bar when operating at the maximum central heating
temperature, then an extra expansion vessel must be fitted to
the system as close as possible to the appliance central heating
return connection. Refer to BS 7074 Part 1.
Any extra vessel fitted must be pressurised to the same figure
as the integral vessel. If the expansion vessel fails then the
specified replacement must be fitted.
11.3 PROGRAMMER
Any programmer fitted on the appliance should be set up at this
stage following the instructions sent with the programmer.
If a facia mounted programmer is to be fitted follow instructions
with the programmer. Remove the facia bottom panel as
described in section 14.3 (c)
11.4 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.
Domestic Hot Water.
Set the CH temperature control knob to the MINIMUM position.
Set the water flow selector clockwise.
Set any programmer to HEATING & WATER
Summary of Contents for 47 311 43
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