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6.6
Heat pump, indoor unit and heating system filling
NOTICE
The system will be damaged if it is powered up without water.
▶ Fill the DHW cylinder and heating system before powering on the
heating system, and establish the correct pressure.
NOTICE
If the system is not correctly ventilated (purged), this will damage
the indoor unit!
The auxiliary heater may overheat or be damaged if it has not been fully
vented prior to activation.
▶ Carefully vent the system when filling.
▶ Carefully vent the system once again during commissioning.
CAUTION
Health risk caused by pollution of drinking water !
Prior to tap water filling:
▶ Flush tank and tap water hydraulic.
▶ Perform tap water system tightness test.
Tightness test must be done with mains water supply only. Test pressure
at warm water side shall not exceed 10 bar.
Vent also by other ventilation valves in the heating system, e.g. radiators.
Fill preferably to a higher pressure than the final one so that there is a
margin when the temperature of the heating system rises and the air that
has been dissolved in the water is vented out via the venting valves.
At delivery the default position of the three-way valve VW1 is in middle
position.
PW2
VC5
T0
VC8
AB
M
VC
Fig. 25 Indoor unit, heat pump and heating system
Pre plumbed cylinder – 6 721 852 928 (2023/04)
VL2
VC9
VC10
VL1
VL1
VC4
VC6
balanced cold connection
VC7
VC3
VC
This filling procedure is valid for all systems, also where the heat pump is
placed above the indoor unit. For a less complex system the procedure
may be simplified.
1. Ensure the power is off to the heat pump and the indoor unit.
Ensure that all temperature regulation valves in the heating system
are fully open.
2. Close the valves to the heating system (VC8 & VC9), the particle filter
SC1, and the valves between heat pump and indoor unit
(VC4 & VC5).
3. Check that the 3-way valve (VW1) is in middle position.
4. Attach the hose of the filling loop to the system fill isolation valves
(VC2 & VC3). Ensure both ends of the hose are screwed on hand tight
and valves VC2 & VC3 are closed.
Step 1: Filling the DHW cylinder
1. Open the cold mains isolation valve VC6
2. Open a hot water tap to fill the cylinder. Close the tap when only water
emerges.
3. Check all compression fittings for tightness.
Step 2: Filling the heat pump and heating system
1. Connect a hose to the drain valve VC7 and the other end to an outlet.
Keep VC7 closed.
2. Open the system fill valves VC2 and VC3 and isolation valve VC5 to fill
the heat pump. Continue filling until no more air emerges from
automatic air vents VL1.
3. Open VC7 and keep open until only water comes out of the hose by
the drain and there are no more bubbles in the heat pump.
4. Open the isolation valve VC4.
5. Close the drain valve VC7 and fill valves VC2 & VC3.
6. Disconnect the hose from VC7 and move it to the heating system
drain valve VC10.
7. Open the particle filter SC1, isolation valve VC8, and the fill valves
VC2 & VC3 to fill the heating system. Continue filling until no more air
emerges from automatic air vents VL2.
8. Open VC10 and continue filling until only water comes out of the hose
by drain.
9. Open the valve VC9. Continue filling until only water comes out of the
hose by the drain and there are no bubbles in the heating system.
10. Close the drain valve VC10 and remove the hose.
11.Open the manual air vent valve (behind the PC0 pump)and close
them when only water emerges. Continue filling until the pressure
gauge on the indoor unit reads between 1.3 to 1.5 bar.
12. Close the fill valves VC2 & VC3.
13. Disconnect the external filling loop refit the blanking caps.
14. Store the braided hose close to indoor unit after system filling.
0010049193-001
Hydraulic connections
23
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