4 Piping installation
Installation manual
11
EWSAH/X06UDA9W
Daikin Altherma 3 WS
4P675760-1 – 2021.10
NOTICE
When circulation in each space heating/cooling loop is
controlled by remotely controlled valves, it is important that
the minimum water volume is guaranteed, even if all of the
valves are closed.
Minimum flow rate
Minimum required flow rate
Heat pump operation
No minimum required flow
Cooling operation
10 l/min
Backup heater operation
No minimum required flow during
heating
INFORMATION
The flow rate of the central water loop circuit can vary up to
10% as a result of the tolerance of the pressure
independent control valve (PICV).
4.2
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.
4.2.1
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.
4.2.2
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 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.
