LG AHBW Series, Руководство по установке

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Accessories Installation
58 Air-to-Water Heat Pump
Expansion vessel should be installed in the water circuit to protect components from water pressure.
- Minimum total water volume is 20 liter. (In special case, extra water volume might be required.)
- Pre-pressure is adjusted by the total water volume. If the unit is located at the highest position of
the water circuit, adjustment is not required.
- To adjust pre-pressure, use nitrogen gas by certificated installer.
Example) Expansion vessel of 8 liter capacity
Maximum total water volume (liter)
Pre-pressure in Expansion vessel (bar)
20 60 100 140 180 220 260 300 340
2.4
2.1
1.7
1.4
1.0
0.7
0.3
Adjusting pre-pressure of expansion vessel is as following :
Step 1. Refer "Volume-Height" table.
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] = (0.1*H + 0.3) [bar] where H : difference between unit and the highest
water pipe 0.3 : minimum water pressure to secure unit operation
Step 3. Volume of expansion vessel is less than installation scene.
Please install additional expansion vessel at the external water circuit.
H : difference between unit and the highest water pipe
V : total water volume of installation scene
V < 230 liter V ≥ 230 liter
H<7 m Case B Case A
H≥7 m Case A Case C
Volume-Height Table
Water Volume and Expansion Vessel Pressure