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3.1 Commission the Boiler
Open Vented Systems - Remove the pump
and flush the system thoroughly with cold
water. Re-fit the pump. Fill and vent the system
then check for leaks.
Sealed Systems - The system can be filled
using a sealed system filler pump with a break
tank or by any other method approved by the
Local Water Authority. Refer to Section 1.6,
'The System' on Page 11 of these instructions.
Remove the pump and flush the system
thoroughly with cold water. Re-fit the pump.
Fill and vent the system until the pressure
gauge registers 1.5 bar (21.5 lbf/in²) and check
for leaks.
IMPORTANT: A pressure relief valve should
not be used as the method to attain the correct
cold fill pressure, unnecessary operation of this
value could cause debris in the system to foul
the valve
Step by Step Commissioning
1
The whole of the gas installation must be
checked for soundness and purged in
accordance with BS 6891.
2
Ensure the system has been flushed, is full of
water and that the pump, radiator and any
other isolating valves are open.
3
On Gravity DHW systems check that the
overheat thermostat is fitted correctly. See
Fig. 19, page 19.
4
Check the water system for leaks and rectify
as necessary.
5
Re-fit the front cover, plinth, top cover and
controls panel (see Fig. 24, page 26).
6
Set the rotary boiler switch on the user controls
to 'O' Stand-by.
7
If a programmer is fitted, set both DHW & CH
to the 'Off' position.
8
Turn the boiler gas service cock to the 'On'
position and then turn On the main gas supply.
9 Preliminary electrical system checks must be
carried out. They are:- Earth Continuity,
Short Circuit, Polarity & Resistance to Earth.
10 Switch On the main electricity supply at the
isolating switch or plug and socket.
Publication No. 5102977
(tick box when done)
11 If a programmer is fitted set both DHW & CH to
the 'On' position and check that the room and
cylinder thermostats, where fitted are set to
high temperatures.
12 The fan will be energised and after a short
period the automatic spark will light the pilot.
When the pilot flame is established the main
burner will ignite and the Green 'Flame' led on
the control panel will illuminate.
Note: On initial lighting, pilot ignition may be
delayed due to the presence of air in the gas
supply.
13 With the main burner running, check for gas
soundness around the boiler using leak
detection fluid.
14 Allow the system to reach maximum working
temperature and examine for leaks. Set the
boiler switch to 'O' and drain the system
whilst still hot.
Note: Should the boiler fail to operate correctly
refer to the Fault Finding Guide on Page 32, and
the boiler wiring diagram on Page 30 for further
information.
15 Re-fill and vent the system making a final
check for leaks.
On sealed systems adjust to the correct cold
fill pressure. Set the pressure gauge pointer
to the system design pressure.
If a by-pass circuit is fitted the by-pass valve
should be adjusted with the boiler operating
under minimum load conditions to maintain
sufficient water flow through the boiler to
ensure that the overheat thermostat does
not operate under normal conditions.
3.2 Final Adjustments
1
Use a pressure gauge to check the inlet and
burner pressures. See the Data Badge for
figures.
2
Turn the boiler on and allow to run for 10
minutes.
3
Check that the inlet pressure is 20mbar with
the boiler running.
4
Check that the burner pressure is in accordance
with the information on the boiler data badge.
Commissioning
23
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