Daikin EHVZ04S18EA6V, Installer'S Reference Manual

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8 | Piping installation
Installer reference guide
86
ERGA04~08EA + 08S18+23EA
Daikin Altherma 3 R F
4P629093-1A – 2021.11
a Recirculation connection
b Hot water connection
c Shower
d Recirculation pump
▪ Valve towards expansion vessel. The valve towards the expansion vessel (if
equipped) MUST be open.
8.5.2 Formula to calculate the expansion vessel pre-pressure
The pre-pressure (Pg) of the vessel depends on the installation height difference
(H):
Pg=0.3+(H/10) (bar)
8.5.3 To check the water volume and flow rate
The indoor unit has an expansion vessel of 10 litre with a factory-set pre-pressure
of 1 bar.
To make sure that the unit operates properly:
▪ You MUST check the minimum and maximum water volume.
▪ You might need to adjust the pre-pressure of the expansion vessel.
Minimum water volume
There are no requirements for the minimum water volume.
INFORMATION
In critical processes, or in rooms with a high heat load, extra water might be
required.
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.
T1
M1
T1
M1
T2
M2
T3
M3
M
FHL1
FHL2
FHL3
M2 M3
T2 T3
HPC1 HPC2 HPC3
a b c
g h f
d e
i
i
h h
h
j
a Outdoor unit
b Indoor unit
c Heat exchanger
d Backup heater
e Motorised 3‑way valve (mixing the main zone)
f Additional pump
g Main pump
h Shut-off valve
i Collector (field supply)
j Overpressure bypass valve (delivered as accessory)