12.1 Lift off the cabinet front panel. .
Check that the electricity and gas supplies to the appliance are
turned off and that all the water connections throughout the
system are tight.
Open the system valves at the appliance. Refer to Fig 16. Open
all the radiator valves. Remove the automatic air vent cap. Refer
to Fig 35.
Fill the system.
Remove the bottom panel to gain access to the filling loop.
Insert the bayonet end of the filling key into the corresponding
cut-outs in the filling loop housing and twist to lock the key in
place. Refer to Fig. 8
Turn the grey knob anti-clockwise to allow water to fill the
system until the pressure gauge shows 2.5bar.
Turn the grey knob clockwise to stop the water flow and remove
the filling key by lining up the bayonet end of the key with the
cut-outs in the filling loop housing and withdraw the key.
Note: The key must always be removed from the filling loop
housing after the system has been filled to prevent accidental
filling and to comply with the Water Regulations.
Check for water soundness throughout the system.
Vent each radiator in turn.
Remove the cap from the pump and turn the shaft about half a
turn. Replace the cap. Refer to Fig. 36.
Lower the facia and check that the relief valve operates by
turning the knob anti-clockwise until it releases. Refer to Fig. 37.
12.2 Set the Expansion Vessel Pressure
The charge pressure of the expansion vessel as dispatched is
0.5bar, which is equivalent to a static head of 5m [17ft].
The charge pressure must not be less than the static head at the
point of connection. A Schraeder type valve is fitted to the
expansion vessel to allow the charge pressure to be increased if
necessary. Refer to Fig. 52. The expansion vessel must be
charged to 0.3bar less than the initial system design pressure.
Note: 1bar = 10.2m = 33.5ft of water.
12.3 Set the System Pressure
Fill the system through the filling loop until the pressure gauge is
at 2.5bar and check for leaks.
Release water through the relief valve until the required system
pressure is obtained, up to a maximum of 1.5bar.
Set the pointer on the pressure gauge to record the set system
pressure.
If the pressure indicated on the gauge is greater than 2.6bar
when operating at the maximum central heating temperature,
12. Commissioning The Appliance
19
Fig 34 - Programmer Connection - Facia Position
4
3
1
2
1. Programmer
2. Programmer
Fixing Clip
3. Pressure
Gauge
4. Programmer
Connector
Fig.37 . Pressure relief valve.
Turn knob
anti-clockwise
to test
Pressure
relief
valve
Fig.35. Auto air vent.
Fig. 36. Pump venting.
1
2
3
1. Electrical
Connections
Cover
2. Pump
3. Cap
6
1
2
3
4
5
1. Auto Air Vent Cap (remove)
2. Auto Air vent
3. Combustion Test Point Cap
4. Combustion Test Point
5. Inner Casing Cover
6. Flue Spigot
