Hitachi YUTAKI S Series Technical Catalogue page 123

9 Electrical and control settings
Optional indoor unit wiring (accessories)
Mark Part name
N
1~ 230V 50Hz
L1
3N~ 400V 50Hz Main power supply connection
L2
-
L3
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
temperature
11
YUTAKI M (R410A) / YUTAKI S / YUTAKI S COMBI: 4-20 mA application (Not used)
YUTAKI M (R32): Earth
12
YUTAKI M (R410A) / YUTAKI S / YUTAKI S COMBI: 4-20 mA application (Not used)
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)
22
Aquastat security for circuit 1
(WP1)
23
24(C) Mixing valve close
25(O) Mixing valve open
26(N) N Common
27(L) Water Pump 2 (WP2)
115 TCGB0123 rev.2 - 10/2019
TERMINAL BOARD 1 (TB1)
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 (except ATW-RTU-04) or any other central device.
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.
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 (HITACHI offers the room thermostat ATW-RTU-04 as accessory) 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.
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).
Terminals intended for the connection of the Aquastat security accessory (ATW-AQT-01)
for controlling water temperature of the circuit 1.
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.
Description
9