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Hydro Unit
Piping to hot water cylinder (option)
Water supplied to the hot water cylinder is branched by
a motorized 3-way valve (locally procured).
For the specifications of the motorized 3-way valve,
refer to "Control parts specifications" on page 12.
Connect the hot water cylinder to port A (open when
energized) of the valve.
▼Fig.7-11
to Hydro Unit
to hot water cylinder
room heating or cooling
AB
Open when de-
B
A
Open when energized
energized
Piping to 2-zone operation
To perform 2-zone temperature control, circulate water
by another pump (locally procured) through a
motorized mixing valve (locally procured) and a buffer
tank (locally procured).
For the specifications of the motorized mixing valve,
Refer to "Control parts specifications" on page 12.
▼Fig.7-12
Motorized mixing valve
(locally procured)
A
Water pump
(locally procured)
AB
B
Zone
2
Buffer tank (locally
procured)
Checking water volume and initial pressure
of expansion vessel for Heating
The expansion vessel of the Hydro Unit has a capacity
of 8 liters.
The initial pressure of the expansion vessel is
0.15 MPa (1.5 bar).
The pressure of the safety valve is 0.43 MPa (4.3 bar).
Verify whether the capacity of the expansion vessel is
sufficient using the following expression. If the volume
is insufficient, add the capacity locally.
19-EN
Expression for expansion vessel selection
V:
Necessary total tank capacity ( )
:
Water expansion coefficient at each hot water
temperature
Vs: Total water amount in the system
P1: System pressure at tank setting position
(MPaabs.)
= water supply pressure = 0.25 (MPaabs.)
(recommended value)
P2: Maximum pressure used during operation at tank
setting position (MPaabs.)
= safety valve setting pressure = 0.53 (MPaabs.)
* The absolute pressure value (abs.) is obtained by
adding the atmospheric pressure (0.1 MPa (1 bar))
to the gauge pressure.
▼Tank selection method
Water temperature and expansion coefficient
Hot water
Hot water
Expansion
temperature
temperature
rate
(°C)
(°C)
0
0.0002
50
4
0.0000
55
5
0.0000
60
from Hydro
10
0.0003
65
Unit
15
0.0008
70
20
0.0017
75
25
0.0029
80
30
0.0043
85
35
0.0050
90
40
0.0078
45
0.0100
to Hydro Unit
▼Fig.7-13
12
10
8
6
4
2
0
0
50
100
150
Vs: Total water amount in the system ( )
*In case the maximum hot water temperature is 65ºC
Install an external expansion vessel when the capacity
of the expansion vessel is insufficient.
Pump operation/configuration
▼Fig.7-14
▼Fig.7-15
Expansion
rate
0.0121
0.0145
0.0171
0.0198
0.0229
0.0258
0.0292
0.0324
0.0361
200
250
300
– 10 –
Hydraulic heat exchanger (6 kW) QH characteristics
Minimum flow rate
10
9
Hydro unit (wall mount)
Out of range
Pump duty
Q-H characteristics (230V)
8
100%
7
6
5
80%
4
3
60%
2
1
0
0
5
10
15
20
25
30
Flow rate [L/min]
Hydraulic heat exchanger (11 kW) QH characteristics
Minimum flow rate
10
9
Hydro unit (wall mount)
Out of range
Pump duty
Q-H characteristics (230V)
100%
8
7
6
5
80%
4
3
60%
2
1
0
0
5
10
15
20
25
30
Flow rate [L/min]
Installation Manual
35
40
35
40
20-EN
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