13Subject to change without notice | 83053500oUK | ait-deutschland GmbH
NOTE
If the length of the pre-assembled cables
(8 m each) is not sufficient, use the cable ex-
tension kit (accessory).
5. Mount the cables on the hydraulic unit.
Operating manual “Hydraulic unit“
8 Flushing, filling and venting
8.1 Heating water quality
NOTE
For detailed information refer, among other
things, to the VDI Guidelines 2035 “Vermei-
dung von Schäden in Warmwasserheizanla-
gen” (preventing damage in hot water heat-
ing systems).
1. Ensure that the ph-value of the heating water is
between 8.2 – 10, for aluminium materials be-
tween 8.2 – 9.
Ideally, the pH value should already be in the re-
quired range after filling. After 6 weeks at the lat-
est, it must have adjusted to the required range.
2. Ensure that the electrical conductivity is < 100 μS/cm.
NOTE
If the required water quality is not achieved,
consult a company specialising in the treat-
ment of heating water.
3. Fill the system with deionised heating water
(VE water) or with water corresponding to the VDI
2035 norm only (low-salt operation of the system).
Advantages of low-salt operation:
● Low corrosion-promoting properties
● No formation of mineral scale
● Ideal for closed heating circuits
4. Keep a system log for hot water heating systems
in which relevant planning data and the water
quality are entered (VDI 2035).
Antifreeze in the heating circuit
It is not permitted to fill an antifreeze or a water/anti-
freeze mixture into the heating circuit.
The heat pump have safety devices that prevent
the water from freezing, even when the heating is
switched off. A prerequisite is that the heat pump re-
mains switched on and is not disconnected from the
mains. Should there be a risk of frost, the circulation
pumps are activated.
8.2 Flushing, filling and venting
the heating circuit
The outlet pipe of the safety valve is connected.
► Ensure that the response pressure of the safety
valve is not exceeded.
IMPORTANT
Flush the heating circuit only in its flow direction.
NOTE
The venting programme on the controller can
also be used to support the flushing and vent-
ing process. It is possible to control individual
circulation pumps and even the changeover
valve via the venting programme. As a result
it is not necessary to remove the valve motor.
1. Vent the system at the highest point.
2. Vent the heat pump at the hydraulic connection set.
“12.2 Maintenance after commissioning“, pa-
ge 15
9 Insulation of hydraulic
connections
Insulate hydraulic lines in accordance with the local
regulations.
1. Open shut-off devices.
2. Perform a pressure test and check for leaks.
3. Insulate external piping on site.
4. Insulate all connections, fittings and pipes.
5. Insulate the condensate drain in a frost-proof
manner (for reversible devices vapour diffusion in-
sulated).
6. Close the device on all sides to ensure rodent
protection.
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