To Protect The Water Circuit Against Freezing - Daikin Altherma H Hybrid EJHA04AAV3 Installer's Reference Manual

10.6.5 To protect the water circuit against freezing

EJHA04AAV3 + EHY2KOMB28+32AA
Daikin Altherma H Hybrid
4P531180-1D – 2025.03
a
Fit the space heating installation with the following parts:
▪ A filling/draining tap in the space heating inlet, immediately underneath the unit.
▪ A draining tap at the lowest point of the installation.
▪ An overflow valve of 3 bar in the input pipe at a distance of no more than
500 mm from the unit. Between the unit and the overflow valve there may be no
valve or constriction.
▪ An expansion vessel in the space heating inlet (in the B-pack or in the
installation).
▪ If there are pipes running up, use a check valve within close distance of the unit.
This prevents a thermosiphon effect from occurring during tap water operation.
Note that the optional valve kits EKVK4A and EKVK6A can also be used to connect
the space heating installation.
NOTICE
Make sure that the straight brass fitting connections are tightened thoroughly to
prevent leakage. Maximum torque is 30 N∙m.
About freeze protection
Frost can damage the system. To prevent the hydraulic components from freezing,
the software is equipped with special frost protection functions, that include the
activation of a pump in case of low temperatures.
However, in case of a power failure, these functions cannot guarantee protection.
Do one of the following to protect the water circuit against freezing:
▪ Add glycol to the water. Glycol lowers the freezing point of the water.
▪ Install freeze protection valves. Freeze protection valves drain the water from
the system before it can freeze. Insulate the freeze protection valves in a similar
way as the water piping, but do NOT insulate the inlet and outlet (release) of
these valves.
WARNING
Ethylene glycol is toxic. If you add glycol to the water, do NOT install freeze
protection valves. The valves release the toxic glycol when they are activated.
Possible consequence:
▪
Heart, kidney or liver damage in case of glycol swallowing or skin contact with
glycol.
▪
Nausea, sickness and diarrhea in case of glycol inhalation.
Freeze protection by glycol
10 Installation
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Installer reference guide
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