Hitachi YUTAKI S Series Installation And Operation Manual

26
PMEN0643 rev.0 - 04/2023
5
SPACE HEATING AND DHW
REFRIGERANT AND WATER PIPING
• The internal air pressure of the expansion vessel tank will be adapted to the water volume of
the nal installaon (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 installaon to permit complete drainage of
the circuit during servicing.
5.3.5 Water ow control
YUTAKI pumps can esmate the water ow by electronic calculaon. 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 calculaon may be aected.
5.4 Space heang and DHW
! DANGER
Do not connect the power supply to the indoor unit prior to lling the space heang circuit (and
DHW circuit if it were the case) with water and checking water pressure and the total absence of
any water leakage.
5.4.5.1 Addional hydraulic necessary elements for space heang
Nature No. Part name
Piping connecons
1 Water inlet (Space heang)
2 Water outlet (Space heang)
Factory supplied 3 Shut-o valve (factory-supplied)
Accessories 4
Water check valve
(ATW-WCV-01 accessory)
Field supplied 5 Shut-o valve

Hitachi YUTAKI S Series Specifications

General

Brand	Hitachi
Model	YUTAKI S Series
Category	Heat Pump
Language	English