Hitachi YUTAKI ATW-YCC-03 Installation And Operation Manual page 48

5.2 Optional unit wiring (accessories)
◆ Summary of the terminal board connections
Mark Part name
1
H-LINK commutation
2
3
H-LINK communication for
remote control switch
4
5 DHW tank's thermistor
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) (*)
18 Input 4 (Solar) (*)
PMEN0581 rev.2 - 04/2023
TERMINAL BOARD 2 (TB2)
Communication between the CASCADE CONTROLLER and terminals 1-2
of the YUTAKI unit, and additionally ATW-RTU-08/09 (for temperature
control) and/or ATW-MBS-02 (only for system monitoring).
Terminals for the connection of the LCD unit controller (PC-ARFH2E) and
Wired Room Thermostat (PC-ARFH2E).
The DHW sensor is used to control the temperature of the domestic hot
water tank.
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.
Available input for Solar combination with Domestic Hot Water Tank.
Description
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