7 Installation
Installer reference guide
32
ERLQ004~008CA + 08S18CB
Daikin Altherma – Low temperature split
4P401676-1D – 2018.07
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 pressure relief valve 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, 4 shut-off valves are provided.
Mount the valves on the space heating water inlet and space heating
water outlet. Mind their position: the integrated drain valves will only
drain the side of the circuit on which they are located. To be able to
only drain the unit, make sure the drain valves are positioned
between the shut‑off valves and the unit.
NOTICE
This unit is designed for operation on 2 temperature zones:
▪ underfloor heating in the
main zone
, this is the zone
with the
lowest water temperature
,
▪ radiators in the
additional zone
, this is the zone with
the
highest water temperature
.
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.
f
a
c
e
d
b
a
Space heating additional zone water out
b
Space heating additional zone water in
c
Domestic hot water out
d
Domestic cold water in (cold water supply)
e
Space heating main zone water out
f
Space heating main zone water in
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.
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
Install air purge valves at all local high points.
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 relief
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
Loosen and remove the 4 screws that fix the top panel.
2
Remove the top panel from the unit.
4×
