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6. Hydraulic Performance
13
THERMA V
Split Type
Hydro Box Unit
6.2 Water Volume and Expansion Vessel Pressure
Expansion vessel inside Hydro Box Unit is included which is 8 liter capacity with 1 bar pre-pressure. That means,
according to the volume-pressure graph, total water volume of 230 liter is supported as default. If total water volume
is changed because of installation condition, the pre-pressure should be adjusted to secure proper operation.
• Minimum total water volume is 20 liter.
• Pre-pressure is adjusted by the total water volume. If the indoor unit is located at the highestposition of the water
circuit, adjustment is not required.
• To adjust pre-pressure, use nitrogen gas by certificated installer.
̰
Adjusting pre-pressure of expansion vessel
•
Step 1.
Refer "Volume-Height" table.
H : difference between indoor unit and the highest water pipe
V : total water volume of installation scene
If installation scene is belong to Case A, go to Step 2.
Otherwise, if it is Case B, do nothing. (pre-pressure adjustment is not required.)
Otherwise, if it is Case C, go to Step 3.
•
Step 2.
Adjust pre-pressure by following equation.
Pre-pressure [bar] = (0.1xH+0.3) [bar]where H : difference between indoor unit and the highest water pipe0.3
: minimum water pressure to secure product operation
•
Step 3.
Volume of expansion vessel is less than installation scene.
Please install additional expansion vessel at the external water circuit.
V
230
˜
V
˻
230
˜
H
7m
Case B
Case A
H
˻
7m
Case A
Case C
Maximum total water volume (liter)
Pre-pressure in Expansion vessel (bar)
20
60
100
140
180
220
260
300
340 360
2.4
2.1
1.7
1.4
1.0
0.7
0.3
Содержание 5BPU0-02C
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