Daikin EHYHBH05AFV32 [45/252] Water circuit requirements
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Daikin EHYHBH05AFV32 [45/252] Water circuit requirements

Daikin EHYHBX08AFV3 [45/252] Water circuit requirements
6 | Preparation
Installer reference guide
45
EVLQ05+08CAV3 + EHYHBH05AF + EHYHBH/X08AF + EHYKOMB33AA
Daikin Altherma hybrid heat pump
4P355634-1F – 2020.10
6.4.1 Water circuit requirements
INFORMATION
Also read the precautions and requirements in the "1 General safety
precautions"[46].
NOTICE
In case of plastic pipes, make sure they are fully oxygen diffusion tight according to
DIN4726. The diffusion of oxygen into the piping can lead to excessive corrosion.
▪ Connecting piping – Legislation. Make all piping connections in accordance with
the applicable legislation and the instructions in the "Installation" chapter,
respecting the water inlet and outlet.
▪ Connecting piping – Force. Do NOT use excessive force when connecting the
piping. Deformation of the piping can cause malfunctioning of the unit.
▪ Connecting piping – Tools. Only use appropriate tooling to handle brass, which is
a soft material. If NOT, pipes will get damaged.
▪ Connecting piping – Air, moisture, dust. If air, moisture or dust gets into the
circuit, problems may occur. To prevent this:
- Only use clean pipes
- Hold the pipe end downwards when removing burrs.
- Cover the pipe end when inserting it through a wall, to prevent dust and/or
particles from entering the pipe.
- Use a decent thread sealant to seal connections.
▪ Closed circuit. Use the indoor unit ONLY in a closed water system. Using the
system in an open water system will lead to excessive corrosion.
▪ Glycol. For safety reasons, it is NOT allowed to add any kind of glycol to the
water circuit.
▪ Piping length. It is recommended to avoid long runs of piping between the
domestic hot water tank and the hot water end point (shower, bath,…) and to
avoid dead ends.
▪ Piping diameter. Select the water piping diameter in relation to the required
water flow and the available external static pressure of the pump. See
"15Technical data"[4222] for the external static pressure curves of the indoor
unit.
▪ Water flow. You can find the minimum required water flow for indoor unit
operation in the following table. In all cases, this flow needs to be guaranteed.
When the flow is lower, the indoor unit will stop operation and display error 7H.
Minimum required flow rate
05 models 7l/min
08 models 8l/min
▪ Field supply components – Water. Only use materials that are compatible with
water used in the system and with the materials used in the indoor unit.
▪ Field supply components – Water pressure and temperature. Check that all
components in the field piping can withstand the water pressure and water
temperature.

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