Table of Contents
Advertisement
5 Piping installation
5.4
Connecting water piping
5.4.1
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 and 1
differential pressure bypass valve are provided. Mount the shut-off
valves on the space heating water inlets and space heating water
outlets.
To
ensure
the
minimum
overpressure), install the differential pressure bypass valve on the
space heating water outlet for the additional zone.
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.
c2
c1
b1
b2
a1
Additional zone – Space heating/cooling – Water IN
(screw connection, 1")
a2
Additional zone – Space heating/cooling – Water OUT
(screw connection, 1")
b1
Main zone – Space heating/cooling – Water IN (screw
connection, 1")
b2
Main zone – Space heating/cooling – Water OUT (screw
connection, 1")
c1
DHW – Cold water IN (screw connection, 3/4")
c2
DHW – Hot water OUT (screw connection, 3/4")
4 Install the following components (field supply) on the cold water
inlet of the DHW tank:
Installation manual
16
flow
rate
(and
prevent
a2
a1
*f
a
c2
c1
a
Shut-off valve (recommended)
b
Non-return valve (recommended)
c1
DHW – Cold water IN (screw connection, 3/4")
c2
DHW – Hot water OUT (screw connection, 3/4")
d
Pressure reducing valve (recommended)
*e
Pressure relief valve (max. 10 bar (=1.0 MPa))
(mandatory)
*f
Tundish (mandatory)
g
Expansion vessel (recommended)
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.
▪ However, make sure there is no valve between the
pressure relief valve (field supply) and the DHW
tank.
NOTICE
A pressure relief valve (field supply) with an opening
pressure of maximum 10 bar (=1 MPa) 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.
Make sure it is NOT between the pressure relief valve
and the DHW tank.
▪ It is recommended to install a pressure reducing valve
on the cold water inlet in accordance with the
applicable legislation.
▪ It is recommended to install an expansion vessel 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.
*e
d
b
a
g
ELVZ12S18+23E
Daikin Altherma 3 R MT F
4P708476-1 – 2023.03
Advertisement
Table of Contents
