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6 Preparation
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
difference
(a)
≤7 m
No pre-pressure
adjustment is required.
>7 m
Do the following:
▪ Increase
the
pressure.
▪ Check if the water
volume
does
exceed the maximum
allowed water volume.
(a) This is the height difference (m) between the highest point of the
water circuit and the indoor unit. If the indoor unit is at the highest
point of the installation, the installation height is 0 m.
6.3.4
Changing the pre-pressure of the
expansion vessel
NOTICE
Only a licensed installer may adjust the pre-pressure of the
expansion vessel.
When changing the default pre-pressure of the expansion vessel
(1 bar) is required, take following guidelines into account:
▪ Only use dry nitrogen to set the expansion vessel pre-pressure.
▪ Inappropriate setting of the expansion vessel pre-pressure will
lead to malfunction of the system.
Changing the pre-pressure of the expansion vessel should be done
by releasing or increasing nitrogen pressure through the schräder
valve of the expansion vessel.
Installer reference guide
24
b
250
300
350
400
450
Water volume
>280 l
Do the following:
▪ Decrease
the
pre-
pressure.
▪ Check
if
the
water
volume
does
NOT
exceed the maximum
allowed water volume.
The expansion vessel of
the indoor unit is too
pre-
small for the installation.
NOT
a Schräder valve
6.3.5
To check the water volume: Examples
Example 1
The indoor unit is installed 5 m below the highest point in the water
circuit. The total water volume in the water circuit is 100 l.
No actions or adjustments are required.
Example 2
The indoor unit is installed at the highest point in the water circuit.
The total water volume in the water circuit is 350 l.
Actions:
▪ Because the total water volume (350 l) is more than the default
water volume (280 l), the pre-pressure must be decreased.
▪ The required pre-pressure is:
Pg = (0.3+(H/10)) bar = (0.3+(0/10)) bar=0.3 bar.
▪ The corresponding maximum water volume at 0.3 bar is 410 l.
(See the graph in the chapter above).
▪ Because 350 l is lower than 410 l, the expansion vessel is
appropriate for the installation.
6.4
Preparing electrical wiring
6.4.1
About preparing electrical wiring
WARNING
▪ If the power supply has a missing or wrong N-phase,
equipment will break down.
▪ Establish proper earthing. Do NOT earth the unit to a
utility pipe, surge absorber, or telephone earth.
Incomplete earthing may cause electrical shock.
▪ Install the required fuses or circuit breakers.
▪ Secure the electrical wiring with cable ties so that the
cables do NOT come in contact with the piping or sharp
edges, particularly on the high-pressure side
▪ Do NOT use taped wires, stranded conductor wires,
extension cords, or connections from a star system.
They can cause overheating, electrical shock or fire.
▪ Do NOT install a phase advancing capacitor, because
this unit is equipped with an inverter. A phase
advancing capacitor will reduce performance and may
cause accidents.
ERLQ004~008CAV3 + EHVH/X04+08S18CA + EHVH/X08S26CA
a
Daikin Altherma - Low Temperature Split
4P313775-1C – 2012.11
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