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6 Preparation
Installer reference guide
19
ERLQ004~008CA + 08S18CB
Daikin Altherma – Low temperature split
4P401676-1 – 2015.02
▪
Filter.
It is strongly recommended to install an additional filter on
both heating water circuits. Especially to remove metallic particles
from foul heating piping, it is recommended to use a magnetic or
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
"8.3.2 Domestic hot
water control: advanced" on page 50
.
▪
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 accordance with the applicable
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
d
a
b
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 for 08 and 20 litre for EHVZ16, the internal water
volume of the indoor unit NOT included. Do
NOT
split up the
minimum water volume over the 2 temperature zones.
It is sufficient to foresee the minimum water volume on the main
zone. In case of underfloor heating, this is easily done by 1 floor
heating loop that never will be closed by a (remotely) controlled
valve.
It is NOT required to foresee the minimum water volume on the
additional zone.
INFORMATION
In critical processes, or in rooms with a high heat load,
extra water might be required.
NOTICE
When circulation in each space heating 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
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
By-pass valve (field supply)
FHL1...3
Floor heating loop (field supply)
HPC1...3
Heat pump convector (field supply)
T1...3
Individual room thermostat (optional)
M1...3
Individual motorised valve to control loop FHL1...3 and
HPC1...3 (field supply)
Maximum water volume
Use the following graph to determine the maximum water volume for
the calculated pre-pressure.
0.3
0.5
1
1.5
2
2.5
100
50
0
10
150
200
250
300
350
400
450
a
b
a
Pre-pressure (bar)
b
Maximum water volume (l)
Example: Maximum water volume and expansion vessel pre-
pressure