Summary Of Terminal Board Connections - Hitachi YUTAKI S COMBI Series Installation And Operation Manual

6.4.2.2 Summary of terminal board connections
Mark Part name
N
~ 230V 50Hz
L1
3N~ 400V 50Hz
L2
‑
L3
1
H‑LINK commutation
2
3
H‑LINK communication for
remote control switch
4
5 Earth
6 Common thermistor
Thermistor for water outlet
7
temperature of second cycle
Thermistor for water outlet
8 temperature after hydraulic
separator
9 Common thermistor
Thermistor for swimming pool
10
water temperature
Thermistor for second ambient
11
temperature
12 Earth
13 Common line
14 Input 1 (Demand ON/OFF) (*)
15 Input 2 (ECO mode) (*)
16 Common line
17 Input 3 (Swimming pool) (*)
PMEN0645 rev.0 - 04/2023
TERMINAL BOARD 1 (TB1)
Main power supply connection
TERMINAL BOARD 2 (TB2)
The H‑LINK transmission has to be done between the indoor unit and
the terminals 1‑2 of either outdoor unit, ATW‑RTU or any other central
device.
Terminals for the connection of the YUTAKI unit controller.
Earth connection for the 3 way valve and water pump
Common terminal for thermistor.
The sensor is used for the second temperature control and should be
positioned after the mixing valve and the circulation pump.
Water sensor for hydraulic separator, buffer tank or boiler combination.
Common terminal for thermistors.
The sensor is used for the swimming pool temperature control and should
be positioned inside plate heat exchanger of the swimming pool.
The sensor is used for the second ambient temperature control and it
should be positioned outdoors.
Earth connection for the 3 way valve and water pump
Terminal Line common for input 1 and input 2.
The air to water heat pump system has been designed to allow the
connection of a remote thermostat to effectively control your home's
temperature. Depending on the room temperature, the thermostat will
turn the split air to water heat pump system ON and OFF.
Available signal which allows to reduce the water setting temperature of
circuit 1, circuit 2 or both.
Terminal Line common for inputs 3, 4, 5, 6, 7.
Only for swimming pool installations: It is necessary to connect an
external input to the air to water heat pump to provide signal when the
water pump of swimming pool is ON.
Description
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