5 Piping installation
Installation manual
11
EWSAH/X06UD
Daikin Altherma 3 WS
4P675760-1C – 2023.02
5.2
Connecting the central water loop
piping
NOTICE
The integrated central water loop valve is a pressure
independent control valve (PICV) which regulates the flow
on the central water loop circuit. To guarantee a correct
operation of the unit, ensure that the least favoured unit
(the unit furthest away from the central pump) has a
minimum of 33 kPa differential pressure available. The
maximum allowed differential pressure is 400 kPa.
5.2.1
To connect the central water loop piping
NOTICE
Do NOT use excessive force when connecting the field
piping and make sure the piping is aligned properly.
Deformation of the piping can cause malfunctioning of the
unit.
a b
a
Central water loop circuit OUT (Ø28 mm)
b
Central water loop circuit IN (Ø28 mm)
NOTICE
To facilitate service and maintenance, it is recommended
to install shut-off valves as close as possible to the inlet
and outlet of the unit.
Example of piping layout
The following diagram is a proposed piping layout for the indoor
piping between the central water loop and the unit.
a b
d
c
d
e
a
Central water loop circuit IN
b
Central water loop circuit OUT
c
Manometer
d
Air purge valve
e
Filter
NOTICE
The central water loop MUST have an expansion vessel
and a safety valve with a pressure rating of maximum 16
bar. The specifications and exact location depend on the
design of the total system.
5.2.2
To fill the central water loop circuit
WARNING
Before, during and after filling carefully check the central
water loop circuit for leakage.
INFORMATION
The materials used in the central water loop circuit of the
unit are chemically resistant to the following anti-freeze
fluids:
▪ 40 mass% propylene glycol
▪ 35 mass% ethylene glycol
NOTICE
Do NOT use the following substances in the central water
loop circuit or in the glycol inhibitors, they can harm the
EPDM of the pressure independent control valve (PICV):
▪ Acids
▪ Lubricants
▪ Oils
▪ Products containing chlorine or fluorine
▪ Alcohols
▪ Petroleum products
▪ Solvents
▪ Lacquers
NOTICE
A field supplied filling kit may come without a filter that
protects components in the central water loop circuit. In
this case, it is the responsibility of the installer to install a
filter on the central water loop side of the system.
WARNING
Temperature of the fluid running through the evaporator
can become negative. It MUST be protected against
freezing. For more information, see setting [A‑04] in
"7.4.4 Central water loop freezing temperature"
36].
5.2.3
To insulate the central water loop piping
The piping in the complete central water loop circuit MUST be
insulated to prevent reduction of the heating capacity.
Consider that the central water loop circuit piping inside the house
can/will condensate. Foresee adequate insulation for these pipes.
5.3
Connecting water piping
5.3.1
To connect the water piping
NOTICE
Do NOT use excessive force when connecting the field
piping and make sure the piping is aligned properly.
Deformation of the piping can cause malfunctioning of the
unit.
1
Install the shut off-valve with integrated filter (delivered as
accessory) at the space heating/cooling water inlet.
