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6.3.2
External filling link (not supplied with appliance)
External filling loop
▶ It is recommended that the external filling loop is
fitted to the District primary side of the system, as
this contains treated water.
▶ If the external filling loop is connected to the cold
main, then it is recommended that the heating
system is flushed and treated to BS 7593.
▶ Connect the flexible hose between the filling loop isolation valves.
▶ When opening the isolation valves take care not to induce any water
hammer.
▶ Open the district heating supply isolation valve.
▶ Open the district heating return isolation valve and release any air
using the manual air vent.
▶ Slowly open the isolation valve on the mains cold water inlet.
▶ Slowly open the isolation valve on the domestic hot water outlet.
▶ Venting district circuit (domestic hot water side): Provide a domestic
hot water demand in order for the domestic hot water control valve
to open, then any air can be vented out using the manual air vents at
the top of the plate heat exchanger.
▶ Open the central heating flow isolation valve
▶ Open the central heating return isolation valve
▶ Open the filling loop isolation valves to start filling the central heating
system.
▶ Monitor the pressure gauge needle.
▶ When the needle reaches between 1 to 1.5 bar on the gauge, close
the filling loop isolation valves to stop the filling process.
▶ Venting district circuit (central heating side): Provide a central
heating demand in order for the central heating control valve to open,
then any air can be vented out using the manual air vents at the top of
the plate heat exchanger.
District heating supply:
The maximum district heating system pressure is 10 bar.
▶ Ensure that the system pressure in the district
heating circuit does not drop below 1 bar as this may
effect system performance.
▶ Check the pressure and top up the central heating system if required.
▶ Repeat this process until there is no more air in the system and the
operating pressure remains stable at between 1 to 1.5 bar.
▶ When venting is complete:
– Ensure that all manual air vents are fully closed.
– Check for any leaks.
Fig. 41
6 720 808 928 (2017/06)
6.4
Control unit
The control units LED indicators can be seen from the top of the case
through two viewing holes.
1
Fig. 42 Control unit LED indicator viewing points.
6.4.1
Control unit LED Indicators
When power is switched ON to the control unit and the rotary switches
are at position 00, both LEDs are yellow. At all other rotary positions
both LEDs are green.
Fig. 43 Control Unit LED indicators
[1]
Domestic hot water LED indicator
[2]
Central heating LED indicator
6720808917-43.1Wo
Commissioning
1
2
31
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