Daikin ERGA04EAV37, Installer'S Reference Manual

Page: 103 / 300

8 | Piping installation
Installer reference guide
103
ERGA04~V3A+V37 + EHSH/X(B)04+08P30+50EF
Daikin Altherma 3 R ECH₂O
4P678716-1A – 2022.07
▪ Water pressure – Domestic hot water. The maximum water pressure is 10 bar.
Provide adequate safeguards in the DHW circuit to ensure that the maximum
pressure is NOT exceeded. The minimum water pressure to operate is 1 bar.
▪ Water pressure – Storage tank. The water inside the storage tank is not
pressurized. Therefore a visual check of the water level in the storage tank has to
be carried out annually, see
"14.3.2 Yearly maintenance indoor unit:
overview" [ 4 255].
▪ Water temperature. All installed piping and piping accessories (valve,
connections,…) MUST withstand the following temperatures:
INFORMATION
The following figure is an example and may NOT completely match your system
layout
89°C 60°C
M
▪ Drainage – Low points. Provide drain taps at all low points of the system in order
to allow complete drainage of the water circuit.
▪ Drainage – Pressure relief valve. Connect the drain hose properly to the drain to
avoid water dripping out of the unit. See "7.4.4 To connect the drain hose to the
drain" [
4
88].
▪ Air vents. Provide air vents at all high points of the system, which must also be
easily accessible for servicing. An automatic air purge is provided in the indoor
unit. Check that the air purge is NOT tightened too much, so that automatic
release of air in the water circuit is possible.
▪ Zn-coated parts. NEVER use zinc coated parts in the water circuit. Because the
internal water circuit of the unit uses copper piping, excessive corrosion may
occur.
▪ Non-brass metallic piping. When using non-brass metallic piping, insulate the
brass and non-brass properly so that they do NOT make contact with each other.
This to prevent galvanic corrosion.
▪ Valve – Change‑over time. When using a 2-way valve or a 3-way valve in the
water circuit, the maximum change-over time of the valve must be 60 seconds.
▪ Expansion vessel . A suitably sized expansion vessel must be installed in the
water circuit in accordance with the applicable legislation. No blocking elements
(shut-off valves or similar) are allowed between the expansion vessel and the
indoor unit.
▪ Magnetic filter/dirt separator . If the indoor unit is connected to a heating
system with radiators, steel pipes, or non-diffusion-proof floor heating pipes, it is
necessary to install a magnetic filter/dirt separator into the return flow of the