EHVH/X16
Daikin Altherma - Low Temperature Split
4P313777-1 – 2012.05
Installer reference guide
20
6 Preparation
Maximum water volume
Use the following graph to determine the maximum water volume for
the calculated pre-pressure.
Example: Maximum water volume and expansion vessel pre-
pressure
6.2.4 Changing 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:
Q
Only use dry nitrogen to set the expansion vessel pre-pressure.
Q
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.
6.2.5 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:
Q
Because the total water volume (350 l) is more than the default
water volume (280 l), the pre-pressure must be decreased.
Q
The required pre-pressure is:
Pg = (0.3+(H/10)) bar = (0.3+(0/10)) bar=0.3 bar.
Q
The corresponding maximum water volume at 0.3 bar is 410 l.
(See the graph in the chapter above).
Q
Because 350 l is lower than 410 l, the expansion vessel is
appropriate for the installation.
6.3
Preparing electrical wiring
6.3.1 About preparing electrical wiring
a
Pre-pressure (bar)
b
Maximum water volume (l)
Installation
height
difference
(a)
Water volume
≤
280 l
>280 l
≤
7 m
No pre-pressure
adjustment is required.
Do the following:
Q
Decrease the pre-
pressure.
Q
Check if the water
volume does NOT
exceed the
maximum allowed
water volume.
>7 m
Do the following:
Q
Increase the pre-
pressure.
Q
Check if the water
volume does NOT
exceed the
maximum allowed
water volume.
The expansion vessel of
the indoor unit is too
small for the installation.
(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.
NOTICE
Only a licensed installer may adjust the pre-pressure of the
expansion vessel.
0.3
0.5
1
1.5
2
2.5
100
50
0
20
150
200
250
300
350
400
450
a
b
a
Schräder valve
WARNING
Q
If the power supply has a missing or wrong N-phase,
equipment will break down.
Q
Establish proper earthing. Do NOT earth the unit to a
utility pipe, surge absorber, or telephone earth.
Incomplete earthing may cause electrical shock.
Q
Install the required fuses or circuit breakers.
Q
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
Q
Do NOT use taped wires, stranded conductor wires,
extension cords, or connections from a star system.
They can cause overheating, electrical shock or fire.
Q
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.
WARNING
Q
All wiring must be performed by an authorized
electrician and must comply with the applicable
legislation.
Q
Make electrical connections to the fixed wiring.
Q
All components procured on the site and all electrical
construction must comply with the applicable
legislation.
a
