Hitachi YUTAKI M R32 Series - Optional Unit Wiring for Accessories; Summary of the Terminal Board Connections

66
PMML0600 rev.0 - 06/2022
6
OPTIONAL UNIT WIRING FOR ACCESSORIES
ELECTRICAL AND CONTROL SETTINGS
6.1 Optional unit wiring for accessories
6.1.1 Summary of the terminal board connections
RASM-(2-3)VRE, RASM-(4-7)(V)R(W)1E and HWM-WE
Mark
Part name
Description
TERMINAL BOARD 1 (TB1)
N
~ 230V 50Hz
Main power supply connection
L1
L2
-
L3
TERMINAL BOARD 2 (TB2)
1
H-LINK communication
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.
2
3
H-LINK communication for
remote control switch
Terminals for the connection of the YUTAKI unit controller.
4
5 DHW tank’s thermistor
The DHW sensor is used to control the temperature of the domestic hot
water tank.
6
Common thermistor
Common terminal for thermistor.
7
Thermistor for water outlet
temperature of second cycle
The sensor is used for the second temperature control and should be
positioned aer the mixing valve and the circulation pump.
8
Thermistor for water outlet
temperature of third cycle
The sensor is used for the third temperature control and should be
positioned aer the hydraulic separator, buer tank or boiler combination.
9
Common thermistor
Common terminal for thermistors.
10
Thermistor for swimming pool
water temperature
The sensor is used for the swimming pool temperature control and should
be positioned inside plate heat exchanger of the swimming pool.
11
Thermistor for second ambient
temperature
The sensor is used for the second ambient temperature control and it
should be positioned outdoors.
12
Earth
Earth connection for the 3 way valve and water pump.
13
Common line
Terminal Line common for input 1 and input 2.
14 Input 1 (Demand ON/OFF) (*)
The air to water heat pump system has been designed to allow the
connection of a remote thermostat to eectively control your home’s
temperature. Depending on the room temperature, the thermostat will turn
the air to water heat pump system ON and OFF.
15 Input 2 (ECO mode) (*)
Available signal which allows to reduce the water setting temperature of
circuit 1, circuit 2 or both.
16
Common line
Terminal Line common for inputs 3, 4, 5, 6, 7.
17 Input 3 (Swimming pool) (*)
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.