– 17 –
EN
Hydro Unit
Installation Manual
Piping to hot water tank (option)
Water supplied to the hot water cylinder is branched by a motorized 3-way valve (procured locally).
For the specifications of the motorized 3-way valve, refer to “Control parts specifications” on page 23.
Connect the hot water cylinder to port A (open when energized) of the valve.
Piping to 2-zone operation
To perform 2-zone temperature control, circulate water by another pump (procured locally) through a motorized
mixing valve (procured locally) and a buffer tank (procured locally).
For the specifications of the motorized mixing valve, Refer to “Control parts specifications” on page 23.
Checking water volume and initial pressure of expansion vessel
The expansion vessel of the Hydro Unit has a capacity of 12 liters.
The initial pressure of the expansion vessel is 0.1 MPa (1 bar).
The pressure of the safety valve is 0.3 MPa (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.
A
B
AB
to hydro unit
room heating or cooling
to hot water cylinder
Open when de-energized
Open when energized
▼
Fig. 7-13
A
B
AB
Motorized mixing valve
(Procured locally)
Open when
energized
Open when
de-energized
to hydro unit
Buffer tank
(Procured locally)
Zone 2
Water pump
(Procured locally)
▼
Fig. 7-14
16-EN
Summary of Contents for ESTIA HWS-1402XWHM3-E
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