7 Installation
Installer reference guide
27
EGSQH10S18AA9W
Daikin Altherma ground source heat pump
4P351748-1D – 2016.02
7.5
Connecting the water piping
7.5.1
About connecting the water piping
Before connecting the water piping
Make sure the indoor unit is mounted.
Typical workflow
Connecting the water piping typically consists of the following
stages:
1
Connecting the water piping of the indoor unit.
2
Connecting the pressure relief valve to the drain.
3
Filling the space heating circuit.
4
Filling the domestic hot water tank.
5
Insulating the water piping.
6
Connecting the recirculation piping.
7
Connecting the drain hose.
7.5.2
Precautions when connecting the water
piping
INFORMATION
Also read the precautions and requirements in the
following chapters:
▪ General safety precautions
▪ Preparation
7.5.3
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.
1
Connect the domestic hot water in and out pipes to the indoor
unit.
a
c
b
d
a
Space heating water out
b
Space heating 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 cold water in
and hot water out connections. Shut-off valves are field
supplied.
NOTICE
To avoid damage to the surroundings in case of domestic
water leakage, it is recommended to close the cold water
inlet stop valves during periods of absence.
2
Connect the space heating in and out pipes to the indoor unit.
NOTICE
▪ A drain device and pressure relief device should 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.
7.5.4
To connect the recirculation piping
Prerequisite:
Only required if you need recirculation in your system.
1
Loosen and remove the screws at the bottom of the unit.
2
Slide the front panel of the unit downwards and remove it.
3
Loosen and remove the 4 screws that fix the top panel.
4
Remove the top panel from the unit.
a
b
a
Knock-out hole
b
Connection for recirculation piping
5
Remove the knock-out hole at the backside of the unit.
6
Connect the recirculation piping to the recirculation connection
and route the piping through the knock-out hole at the backside
of the unit.
7
Re-attach the insulation and casing.
7.5.5
To connect the pressure relief valve to the
drain
The blow out of the pressure relief valve is coming out of the
backside of the unit.
