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PMEN0645 rev.0 - 04/2023
5
SPACE HEATING AND DHW
REFRIGERANT PIPING
• The internal air pressure of the expansion vessel tank will be adapted to the water volume of
the nal installaon (factory supplied with 0.1 MPa of internal air pressure).
• Do not add any type of glycol to the water circuit.
• Drain taps must be provided at all low points of the installaon to permit complete drainage of
the circuit during servicing.
5.3.4 Water ow control
YUTAKI pumps can esmate the water ow by electronic calculaon. Therefore, there is no need to
install a water ow switch with the new YUTAKI pumps.
However, if a secondary pump is installed or glycol is used (in the case of YUTAKI M), it is necessary
to install a water ow control, as the electronic calculaon may be aected.
5.4 Space heang and DHW
! DANGER
Do not connect the power supply to the indoor unit prior to lling the space heang and DHW
circuit with water and checking water pressure and the total absence of any water leakage.
5.4.4.1 Addional hydraulic necessary elements for space heang
Nature No. Part name
Piping connecons
1 Water inlet (Space heang)
2 Water outlet (Space heang)
Factory supplied 3 Shut-o valve (factory-supplied)
Accessories 4
Water check valve
(ATW-WCV-01 accessory)
Field supplied 5 Shut-o valve
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