Air-to-water Heat Pump Split Versati
68
SPLIT TYPE
4.5.4 Precautions on installation of indoor unit
(1) Indoor unit shall be vertically mounted on the wall of the room with expansion bolt.
(2)
Keep the indoor unit away from heat sources like heat sink and so on in the room as much as possible.
(3) Keep the indoor unit as close as possible to outdoor unit. Level distance between connection pipes cannot
exceed 98.42ft(30m) and vertical distance cannot exceed 49.21ft(15m).
4.5.5 Water volume and expansion vessel pressure
Pre-pressure in expension vessel(Bar)
Maximum total water volume(liter)
2.5
2.0
1.5
1.0
0.5
0.0
0
50
100
150
200
250
300
350
400
Notes
(a) The expansion vessel is 10 liter and 1bar pre-pressurized;
(b) Total water volume of 280 liter is default; if total water is changed because of installation condition, the pre-
pressure should be adjusted to secure proper operation. If the indoor unit is located at the highest position,
adjustment is not required;
(c) Minimum total water volume is 20 liter;
(d)
To adjust pre-pressure, use nitrogen gas by certificated installer.
4.5.6 Selection of expansion vessel
Formula:
V--- Volume of expansion vessel
C--- Total water volume
P
1
--- Pre-set pressure of expansion vessel
P
2
-- The highest pressure during running of the system (that is the action pressure of safety valve.)
e---The expansion factor of water (the difference between the expansion factor of the original water temperature
and that of highest water temperature.)
Water expansion factor in different temperature
Temperature(°F/°C)
Expansion factor e
32/0
0.00013
39.2/4
0
50/10
0.00027
68/20
0.00177
86/30
0.00435
104/40
0.00782
