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6 Preparation
cyclone filter, which can remove small particles. Small particles
may damage the unit and will NOT be removed by the standard
filter of the heat pump system.
▪ Domestic hot water tank – Capacity. To avoid stagnation of
water, it is important that the storage capacity of the domestic hot
water tank meets the daily consumption of domestic hot water.
▪ Domestic hot water tank – After installation. Immediately after
installation, the domestic hot water tank must be flushed with fresh
water. This procedure must be repeated at least once a day the
first 5 consecutive days after installation.
▪ Domestic hot water tank – Standstills. In cases where during
longer periods of time there is no consumption of hot water, the
equipment MUST be flushed with fresh water before usage.
▪ Domestic hot water tank – Disinfection. For the disinfection
function of the domestic hot water tank, see
water control: advanced" on
page 62.
▪ Thermostatic mixing valves. In accordance with the applicable
legislation, it may be necessary to install thermostatic mixing
valves.
▪ Hygienic measures. The installation must be in compliance with
the applicable legislation and may require additional hygienic
installation measures.
▪ Recirculation
pump.
In
legislation, it may be required to connect a recirculation pump in
between the hot water end point and the recirculation connection
of the domestic hot water tank.
c
a
b
d
a
Recirculation connection
b
Hot water connection
c
Shower
d
Recirculation pump
6.4.2
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)
6.4.3
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
Check that the total water volume in the installation is minimum
10 litre, the internal water volume of the indoor unit NOT included.
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.
Installer reference guide
26
"8.3.2 Domestic hot
accordance
with
the
applicable
a
b
c
d
f
T1
M1
e
f
FHL1
a
Outdoor unit
b
Indoor unit
c
Heat exchanger
d
Backup heater
e
Pump
f
Shut-off valve
g
Collector (field supply)
h
By-pass valve (field supply)
FHL1...3
Floor heating loop (field supply)
T1...3
Individual room thermostat (optional)
M1...3
Individual motorised valve to control loop FHL1...3 (field
supply)
Maximum water volume
Use the following graph to determine the maximum water volume for
the calculated pre-pressure.
a
2.5
2
1.5
1
0.5
0.3
0 10
50
100
150
200
a
Pre-pressure (bar)
b
Maximum water volume (l)
Example: Maximum water volume and expansion vessel pre-
pressure
Installation
height
≤280 l
(a)
difference
≤7 m
No pre-pressure
adjustment is required.
ERLQ004~008CA + EHVH/X04+08S18+26CB
g
h
T2
T3
M2
M3
FHL2
FHL3
b
250
300
350
400
450
Water volume
>280 l
Do the following:
▪ Decrease
the
pre-
pressure according to
the required installation
height difference. The
pre-pressure
should
decrease by 0.1 bar for
each metre below 7 m.
▪ Check
if
the
water
volume
does
NOT
exceed the maximum
allowed water volume.
Daikin Altherma – Low temperature split
4P384973-1D – 2018.07
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