Toshiba XXXXXXX(<SanSerif1>X/X)
–16–
Hydro Unit
Installation Manual
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 21.
Connect the hot water cylinder to port A (open when
energized) of the valve.
▼ Fig. 7-13
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 21.
▼ Fig. 7-14
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.
Expression for expansion vessel selection
V: Necessary total tank capacity ( )
: Water expansion coefficient at average hot water
temperature
Vs: Total water amount in the system
P1: System pressure at tank setting position
(MPaabs.)
(Pipe inner pressure during pump operation
before heating device operates = water supply
pressure)
P2: Maximum pressure used during operation at tank
setting position (MPaabs.)
(= safety valve setting pressure)
* The absolute pressure value (abs.) is obtained by
adding the atmospheric pressure (0.1 MPa (1 bar))
to the gauge pressure.
▼ Tank selection method
▼ Fig. 7-15
Install an external expansion vessel when the capacity
of the expansion vessel is insufficient.
A
B
AB
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