Hitachi YUTAKI ATW-YCC-03 Installation And Operation Manual page 26

ELECTRICAL AND CONTROL SETTINGS
9.2 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 water
10
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) (*)
20 Input 6 (DHW boost) (*)
21 Input 7 (Power meter)
24(C) Mixing valve close
25(O) Mixing valve open
26(N) N Common
27(L) Water Pump 2 (WP2)
28
Auxiliary power
29
30(N)
Electrical Heater DHW Output
31(L)
32(C) Control line
20 PMML0581 rev.1 - 02/2023 - 1000011627
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.
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.
Available input for an instantaneous heating of the domestic hot water of the tank.
The measuring of the real power consumption can be done connecting an external power meter.
The number of pulses of the power meter is a variable which must be set. By this, every pulse
input is added into corresponding operation mode (Heating, Cooling, DHW Operation). Two
possible options:
• One power meter for all installation (IU+OU).
• Two separated power meters (one for IU and one for OU).
When a mixing system is required for a second temperature control, these outputs are necessary
to control the mixing valve.
When there is a second temperature application, a secondary pump is the circulating pump for
the secondary heating circuit.
Power supply for ATW-RTU and central device
If DHW tank contains an electric heater, the air to water heat pump can activate it if the heat
pump cannot achieve the required DHW temperature by itself.
Control terminal for the 3-way valve for DHW tank.
Description