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Subject to change without notice | 83059600lUK | ait-deutschland GmbH
Antifreeze in the heating circuit
For air/water heat pumps installed outdoors, it is not
necessary to fill a water/antifreeze mixture into the he-
ating circuit.
The heat pumps have safety devices that prevent the
water from freezing, even when the heating is swit-
ched off. A prerequisite is that the heat pump remains
switched on and is not disconnected from the mains.
Should there be a risk of frost, the circulation pumps
are activated.
The following points must be observed if antifreeze is
added, depending on the concentration of the mixture:
●
Heat output of the heat pump is reduced
●
COP value becomes worse
●
In the case of on-site circulating pumps, the deliv-
ery rate is reduced; in the case of integrated cir-
culating pumps, the specified free pressure drops
●
The compatibility of the material of the compon-
ents used with the antifreeze mixture must be en-
sured
8.2 Flushing, filling and venting
the heating circuit
Outlet pipe of the safety valve is connected.
►
Ensure that the response pressure of the safety
valve is not exceeded.
NOTE
The venting program 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 programs. 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.
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. If the unit is used for cooling below 18 °C (only pos-
sible in combination with the wall-mounted control-
ler), the insulation must be vapour diffusion-tight.
6. Insulate the condensate drain in a frost-proof
manner.
7. Fit the cover hood on the connection set.
8. The unit must be completely closed on all sides to
ensure rodent protection.
10 Setting the overflow valve
NOTE
●
The activities in this section are only nec-
essary for the integration of the storage
tank in series.
●
Complete the work steps quickly, other-
wise the maximum return temperature
could be exceeded and the heat pump will
switch to high-pressure fault.
●
Turn the rotary-push button on the over-
flow valve to the right to increase the tem-
perature difference (the spread), turn it to
the left to reduce it
The system is running in heating mode (ideally in
cold condition).
The IBN assistant already provides the option, in the
event of the integration of the storage tank in series to
adjust the overflow valve according to to the hydrau-
lic system.
Confirm the IBN assistant or:
