5
Note
If the heat pump is switched OFF and ON again, for instance after a power failure, the compressor will only
re-start (after approx. 3 minutes), when the pressure inside the refrigerant circuit has normalised again.
Operation With Active Defrost Feature
Note
The heat pump must not be installed in areas where ambient temperatures frequently exceed 42 ¡C or
areas where temperatures frequently drop below 0 ¡C.
Subject to the relative humidity and the DHW temperature, the evaporator begins to build up hoar frost at an
ambient temperature below 6 ¡C.
If the evaporator is covered in hoar frost, the frost monitor N2 (see wiring diagram) switches the fan OFF, whilst the
compressor continues to run, and the changeover valve V2 routes the hot gas directly to the evaporator. For this,
the condenser is shut off by changeover valve V1. When the temperature at the evaporator fins rises above 3 ¡C,
the fan is started again, and DHW heating continues.
The DHW heat pump can be operated at ambient temperatures as low as 0 ¡C. The evaporator is defrosted
according to demand in the temperature range 0 ¡C to +6 ¡C. This extends the heat-up time.
MAINTENANCE AND CLEANING
Material Losses
The sacrificial anode must be checked by a licensed tradesperson 12 months after the unit has been in-
stalled and checked periodically thereafter as advised by the licensed tradesperson.
Failure to do so may void your warranty.
Note
Maintenance work, e.g. checking the electrical safety, must only be carried out by a licensed tradesperson.
The device is generally maintenance free, with the exception of cleaning the condensate drain and having a
licensed tradesperson check the sacrificial anode.
A damp cloth is sufficient for cleaning all parts. Never use scouring or solvent-based cleaning agents.
- Check at least monthly the condensate drain at the middle of the unit and the condensate pan drain at the top
(visual check). Remove contaminants and blockages immediately.
- Ask your local tradesperson to regularly check the safety assembly and the electric booster heater.
- The device is subject to mains water pressure. The expansion water drips from the safety valve during heat-up.
Inform your local tradesperson of water drips from the system after the heat-up process has ended.
- To protect the steel cylinder against corrosion, the interior is coated with a special enamel and is furthermore
equipped with a protective anode. Ask your local tradesperson to check the protective anode 12 months after
installation and periodically thereafter as advised by your local tradesperson. A sacrificial anode maintenance log
is located on page 9 of this manual for your local tradesperson to fill in. Your local tradesperson, who is familiar
with the local water quality, should identify for you the timing of the next service.
!
