Optional Unit Wiring For Accessories; Summary Of The Terminal Board Connections - Hitachi YUTAKI M RASM-3WF2E Installation And Operation Manual

6.1 Optional unit wiring for accessories

6.1.1 Summary of the terminal board connections
T
T
Mark Part name
L1 ~ 230V 60Hz
L2 -
1
H-LINK communication
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 of third cycle
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) (*)
19 Input 5 (Smart function) (*)
PMEN0657 rev.0 - 02/2024
< > OK
TERMINAL BOARD 1 (TB1)
TERMINAL BOARD 2 (TB2)
The H-LINK transmission for service purpose
Terminals for the connection of the YUTAKI unit controller.
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.
The sensor is used for the third temperature control and should
be positioned after the 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 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.
For the connection of an external tariff switch device to switch OFF the
heat pump during peak electricity demand period. Depending on the
setting, the heat pump or DHWT will be blocked when signal is open/
closed.
ON OFF
Description
Main power supply connection
T
T
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