Hitachi YUTAKI S COMBI Series Installation And Operation Manual page 58


NOTE
• If wireless intelligent thermostat is selected, optional ON/OFF thermostat has no effect.
• Set the configuration in the user's control.
• In case of setting an installation with 2 circuits (Circuit 1 and Circuit 2) and a different
Demand ON/OFF is used for each of them, please refer to
connections" section in this chapter.
• Auxiliary power supply is available for thermostats and central devices (28 and 29 terminals of TB2).
ECO (Default for input 2)
◆
When enabled at Unit controller, both for circuit 1 and circuit 2, also for heating and cooling, this
input switches the indoor unit into an ECO mode by adjusting its settings only when input is closed.
The input can come from a push button, a thermostat or any other external device with that purpose.
Swimming pool (Default for input 3)
◆
When it is necessary to control the temperature of the swimming pool water, a connection
between the heat pump and the corresponding sensor must be done on terminals 16 and 17 at the
Terminal board (input 4).
◆ Solar (Default for input 4)
This input comes from a solar panel sensor. The solar combination by input demand allows HSW
to be heated by solar system when there is enough solar energy available. The connection of this
input signal has to be done between terminals 16 and 18 at TB2.
PMEN0645 rev.0 - 04/2023
15
13
Common
Line
ECO
Input 2
16 17
Common
Line
SWP
IN
Input 3
16 18
Common
Line
"6.4.2.2 Summary of terminal board
Solar
IN
Input 4
6
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