Technical data

10. MINIMUM AND MAXIMUM SYSTEM WATER CONTENT
Minimum system water content
The minimum water content for the system shown in table 1 allows the number of compressor starts and stops to be limited.
Expansion vessel calibration
The expansion vessels are pre-charged to a standard pressure
of 1 bar.
The pre-charge pressure is chosen depending on the maximum
difference in height between the system terminal and the heat
pump, as shown in the figure.
The maximum height must not exceed 55 metres due to the
maximum vessel pre-charge pressure of 6 bars.
Make sure that the system terminal at the lowest point H1 can
withstand the pressure of the water column at that point.
H
H1
Maximum system water content
The heat pumps are fitted as standard with an expansion vessel and safety valve. The maximum system water content depends on the
capacity of the expansion vessel (see table 2) and the calibration of the safety valve (see table 3).
Table 4 shows an example of the maximum water content in the specified normal operating conditions.
If the volume of water in the system is higher, an additional, correctly sized expansion vessel is required.
Tab. 1
Size 0031
Minimum water content l 26
Tab. 2
Size 0031
Expansion vessel l 8
Tab. 3
Size 0031
Safety valve bar 3
Tab. 4
System water temperature °C 20
Hydraulic head m 30 25 20 15 >12,25
Expansion vessel pre-charge bar 3,2 2,8 2,3 1,8 1,5
Maximum water content l - 277 820 1365 1665
System water temperature °C 35
Hydraulic head m 30 25 20 15 >12,25
Expansion vessel pre-charge bar 3,2 2,8 2,3 1,8 1,5
Maximum water content l - 85 254 420 515
System water temperature °C 45
Hydraulic head m 30 25 20 15 >12,25
Expansion vessel pre-charge bar 3,2 2,8 2,3 1,8 1,5
Maximum water content l - 50 150 250 305
System water temperature °C 55
Hydraulic head m 30 25 20 15 >12,25
Expansion vessel pre-charge bar 3,2 2,8 2,3 1,8 1,5
Maximum water content l - 34 102 170 207
i-KI(R) MTD
HFC 410Ai-KI(R)_MTD_0031_201110_EN
30