LG THERMA V AHNW16606B0, Installation Manual, Page: 26 / 65

Installation of Indoor Unit
26 Air-to-Water Heat Pump
1
Ball valve
2
Pressure reducing valve
3
Check valve
4
Safety valve
5
Expansion vessel
6
Charging pipe
7
Circulation pump
8
Cold sanitary water
9
Cold circulation water
10
Warm sanitary water
Adjusting the safety valve [MPa (bar)] 0.6 (6.0)
System pressure [MPa (bar)] 0.3 (3.0) 0.35 (3.5) 0.4 (4.0)
Volume of the DHW [L] 200
Expansion vessel[L] 5 8 12
Setting the pressure for the expansion vessel for DHW
Expansion vessel for DHW is factory filled to a precharge pressure p0 with dry nitrogen. The pressure must
be set depending on the settings of the pressure reducing valve on the DHW supply to the building.
The pressure in the expansion vessel must be set according to the following formula:
P
0
[ MPa ] = P
rv
[ MPa ] -0.02 [ MPa ],
( P
0
[ bar ]= P
rv
[ bar ] -0.2 [ bar ])
P
0
– pressure in the expansion vessel
P
rv
– setting of the pressure reducing valve