Daikin EGSQH10S18AA9W Installer's Reference Manual page 83

Domestic hot water
A (°C)
25
20
15
10
5
0
0 10
–5
–10
A Entering brine temperature
B Leaving condenser water temperature
Only backup heater operation.
Heat pump operation
Protect against freezing by adding anti-freeze to brine side. See also remark.
Remark: By default settings, the unit will allow operation with
entering brine temperatures to –5°C. As a result, the brine freezing
temperature may not be higher than –15°C! For water – ethanol
mixtures this corresponds to 29% ethanol (by mass), for water –
propylene glycol mixtures this corresponds to 40% propylene glycol
(by volume).
If the freezing temperature of the medium is higher than –15°C, then
protection level of unit MUST be increased by field setting.
Refer to the installation manual and/or installer reference guide for
instructions how to set a different freeze temperature of the medium
(Tf) in the controller.
The unit will NOT operate at an entering brine temperature lower
than Tf+10K.
Tf = changeable between 0°C and –15°C.
EGSQH10S18AA9W
Daikin Altherma ground source heat pump
4P351748-1D – 2016.02
20 30 40 50 60 70
B (°C)
4D083082-1B
14 Technical data
Installer reference guide
83