To Connect The Recirculation Piping - Daikin ERGA04DAV3A Installer's Reference Manual

7.8 Connecting the water piping
7.8.1 About connecting the water piping
Before connecting the water piping
Make sure the outdoor and indoor unit are mounted.
Typical workflow
Connecting the water piping typically consists of the following
stages:
1 Connecting the water piping to the indoor unit.
2 Connecting the recirculation piping.
3 Connecting the drain hose to the drain.
4 Filling the water circuit.
5 Filling the domestic hot water tank.
6 Insulating the water piping.
7.8.2 Precautions when connecting the water
piping
INFORMATION
Also read the precautions and requirements in the
following chapters:
▪ General safety precautions
▪ Preparation
7.8.3 To connect the water piping
NOTICE
Do NOT use excessive force when connecting the piping.
Deformation of the piping can cause malfunctioning of the
unit.
To facilitate service and maintenance, 2 shut-off valves and 1
overpressure bypass valve are provided. Mount the shut-off valves
on the space heating water inlet and space heating water outlet. To
ensure the minimum flow rate (and prevent overpressure), install the
overpressure bypass valve on the space heating water outlet.
1 Install the shut-off valves on the space heating water pipes.
2 Screw the indoor unit nuts on the shut-off valve.
3 Connect the domestic hot water in and out pipes to the indoor
unit.
c d a b
a Space heating/cooling water out
b Space heating/cooling water in
c Domestic hot water out
d Domestic cold water in (cold water supply)
NOTICE
It is recommended to install shut-off valves to domestic
cold water in and domestic hot water out connections.
These shut-off valves are field supplied.
Final English - Tanslations in progress
ERGA04~08DAV3(A) + EHVH/X04+08S18+23DA
Daikin Altherma – Low temperature split
4P495248-1 – 2017.12
NOTICE
To avoid damage to the surroundings in case of water
leakage, it is recommended to close the domestic cold
water inlet shut‑off valves during periods of absence.
NOTICE
Overpressure bypass valve (delivered as accessory). We
recommend to install the overpressure bypass valve in the
space heating water circuit.
Mind the minimum flow rate when adjusting the
overpressure bypass valve setting. See
the water volume and flow rate" on page 26
check the minimum flow rate" on
NOTICE
A pressure relief valve (field supply) with an opening
pressure of maximum 10 bar must be installed on the
domestic cold water inlet connection in accordance with
the applicable legislation.
NOTICE
▪ A drain device and pressure relief device must be
installed on the cold water inlet connection of the
domestic hot water cylinder.
▪ To avoid back siphonage, it is recommended to install a
non-return valve on the water inlet of the domestic hot
water tank in accordance with the applicable legislation.
▪ It is recommended to install a pressure reducing valve
on the cold water inlet in accordance with the
applicable legislation.
▪ An expansion vessel should be installed on the cold
water inlet in accordance with the applicable legislation.
▪ It is recommended to install the pressure relief valve on
a higher position than the top of the domestic hot water
tank. Heating of the domestic hot water tank causes
water to expand and without pressure relief valve the
water pressure inside the tank can rise above the tank
design pressure. Also the field installation (piping,
tapping points, etc.) connected to the tank is subjected
to this high pressure. To prevent this, a pressure
relieve valve needs to be installed. The overpressure
prevention depends on the correct operation of the field
installed pressure relief valve. If this is NOT working
correctly, overpressure will deform the tank and water
leakage may occur. To confirm good operation, regular
maintenance is required.
7.8.4

To connect the recirculation piping

Prerequisite: Only required if you need recirculation in your system.
1 Remove the top panel from the unit, see
indoor unit" on page 29.
2 Cut out the rubber grommet on top of the unit, and remove the
stop. The recirculation connector is placed below the hole.
3 Route the recirculation piping through the grommet and connect
it to the recirculation connector.
7 Installation
"6.4.3 To check
and "9.4.1 To
page 77.
"7.2.3 To open the
Installer reference guide
39