TF7039GB_A_NOT
Page 35 of 48
OPERATING RANGE AND OPERATING LIMITS
The operating limits refer to a temperature difference at the evaporator and at the condenser of
△
t = 5°C.
Whenever the unit is to be operated outside the operating range, we recommend that you contact our tech-
nical service department beforehand.
For further information, please refer to the table of power ratings and power consumption deviating from the
nominal value in the corresponding chapter.
When operating under full load, the unit provides hot water up to 55°C. An efficiency limit is pre-programmed
at the factory, which switches off the heat pump at a buffer memory temperature of 40°C (bottom). This can
be adapted on site or during commissioning. This is particularly suitable for operation with own electricity
(e.g. from photovoltaics). Refer to the operating instructions for the control module (UVR) for details.
In its standard configuration, the unit is not suitable for installation in a salty environment.
7.2.1.
REQUIREMENTS FOR THE SINK MEDIUM
In order to ensure the unit operates faultlessly for many years, we strongly recommend filling the sink-side
system circuit with softened and desalinated water. We also recommend the use of water filters on site. This
serves to protect against corrosion and contamination of the heat exchanger.
The following limit values must be adhered to:
PH value
7.5-9
Iron (Fe)
< 0.3 ppm
Electrical conductivity
100-500 µS/cm
Alkalinity (HCO3)
70-300 ppm
Total hardness
4.5-8.5 dH
Chlorine ions (Cl-)
< 50 ppm
Temperature
< 65°C
Sulphate ions (S)
< 50 ppm
Oxygen content
< 0.1 ppm
Sulphide ions (S)
None
Glycol percentage
< 50%
Ammonia ions (NH4)
None
Phosphate (PO4)
< 2 ppm
Silicon dioxide (SiO2)
< 30 ppm
Manganese (Mn)
< 0.05 ppm
