EKHVH/X00 EKHVH/9WN
Daikin Altherma indoor unit
4PW64329-1 – 07.2010
Installation manual
17
Checking the maximum allowed water volume
To determine the maximum allowed water volume in the entire circuit,
proceed as follows:
1
Determine for the calculated pre-pressure (Pg) the
corresponding maximum water volume using the graph below.
2
Check that the total water volume in the entire water circuit is
lower than this value.
If this is not the case, the expansion vessel inside the indoor unit is
too small for the installation.
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.
In this example, no action or adjustment is 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.
Result:
■
Since 350 l is higher than 280 l, the pre-pressure must be
decreased (see table above).
■
The required pre-pressure is:
Pg=(H/10+0.3) bar=(0/10+0.3) bar=0.3 bar
■
The corresponding maximum water volume can be read from
the graph: approximately 410 l.
■
Since the total water volume (350 l) is below the maximum water
volume (410 l), the expansion vessel suffices for the installation.
Setting the pre-pressure of the expansion vessel
When it is required to change the default pre-pressure of the
expansion vessel (1 bar), keep in mind the following guidelines:
■
Use only dry nitrogen to set the expansion vessel pre-pressure.
■
Inappropriate setting of the expansion vessel pre-pressure will
lead to malfunction of the system. Therefore, the pre-pressure
should only be adjusted by a licensed installer.
Accessing the expansion vessel:
■
Remove the front and left decoration panels, refer to
"5.1. Opening the unit" on page 9
.
■
Remove the switch box, refer to
"Removing the switch box" on
page 40
.
1
Expansion vessel
Charging water
1
Connect the water supply to a drain and fill valve (see
"5.2. Main
components in the unit" on page 9
).
2
Make sure the automatic air purge valve is open (at least 2
turns).
3
Fill with water until the manometer indicates a pressure of
approximately 2.0 bar. Remove air in the circuit as much as
possible using the air purge valves. Air present in the water
circuit might cause malfunctioning of the backup heater.
= pre-pressure
= maximum water volume
To set the pre-pressure, the expansion vessel needs to be
accessed from the front or from the left.
0.3
0.5
1
1.5
2
2.5
100
50
0
20
150
200
250
300
350
400
450
maximum water volume [l]
pre-pressure [bar]
NOTICE
If air purge problems
occur due to air in the
suction side of the pump,
then air can be removed
by temporarily
unscrewing the nut in the
head of the pump as
indicated in the figure.
1
Summary of Contents for EKHVH008BB6V3
Page 47: ...NOTES NOTES...
