Hitachi YUTAKI M Serie Manuel D'utilisation page 30

ELECTRICAL AND CONTROL SETTINGS
9.4 OPTIONAL UNIT WIRING (ACCESSORIES)
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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
11
4-20 mA application
12
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
20 PMML0342B rev.1 - 03/2016
TERMINAL BOARD 2 (TB2)
The H-LINK transmission has to be done between the unit and the terminals 1-2 of either outdoor
unit, 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.
It is possible to connect an external controller to the connector CN5 to provide a manual water
temperature setting. The input current (4-20 mA) will be transformed into voltage by means of a
grounded 240 Ω resistor (ATW-MAK-01 accessory) connected to these terminals. The DSW5 pin
3 must be in ON position and the SSW1 has to be in Local mode (Enabled manual operation) to
enable this function.
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).
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.
Description