Hydraulic connections
Compress 5800i AW – 6721858460 (2023/06)
20
Fig. 24 Heat pump connections tap water
[1] Domestic hot water out
[2] Cold water inlet
5.6 Heat pump, indoor unit and heating system filling
NOTICE
The system will be damaged if it is powered up without water.
The system may 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 tap water 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.
Fig. 25 Indoor unit, heat pump and heating system
[1] Fill valve VW2
[2] Particle filter SC1
[3] Manual air vent valves
[4] Drain valve VA0
[*] The non-return valve is required for heating systems.
[**] Expansion vessel (external expansion vessel, if it is not
integrated)
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.
Step 1: Filling the heat pump and the DHW cylinder
1. Switch of the power to the heat pump and the indoor unit.
2. Ensure that all temperature regulation valves in the heating system
are fully open.
3. Close the valves to the heating system, VC3 and particle filter SC1,
and the valve VC4 between IDU and ODU.
4. Connect a hose to the drain valve VC5 and the other end to an outlet.
Open the valve.
5. Open the fill valve VW2 to fill the heat pump.
6. Continue filling until only water comes out of the hose by the drain
and there are no more bubbles in the heat pump.
7. Open the valve VC4.
8. Close the drain valve VC5 and the fill valve VW2.
9. Open the cold water valve VW3.
VW3
1 2
0010038743-002
VC2
PC1 TC1
T0
TC0
PC0
PW2
VW2
VC3
SC1
VW3
VA0
MD1
*)
VC4
VL1
VC5
VW1
**)
**)
3
2
1
3
0010040382-005
4
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