Hitachi YUTAKI Series Installation And Operation Manual page 70

ELECTRICAL AND CONTROL SETTINGS
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Water outlet thermistor for circuit 2 (TWO2)
When the installation is configured with a second circuit the thermistor for the water outlet temperature have to be connected
between terminals 6 and 7 of the terminal board 2.
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Room thermostat communication cables
There are two different room thermostat types as accessory
Optional wireless intelligent room thermostat (TB2) ATW-RTU
Only for wireless room thermostat accessory: the receiver is connected to the polarity-free terminals1 and 2.
The Wireless room thermostat and the Intelligent receiver are already configured to communicate with each other. If the Wireless
room thermostat or the Intelligent receiver is replaced or an additional second temperature circuit thermostat is added, it is
necessary to rebind them as explained in the manual of the Wireless intelligent room thermostat.
The Intelligent receiver is connected to the indoor unit table board as shown in the next picture:
Optional wireless ON/OFF room thermostat ATW-RTU-04
The heat pump system has been designed to allow the connection of a remote ON/OFF thermostat to effectively control the home
temperature. Depending on the room temperature, the thermostat will turn the system to ON or OFF.
a. If no thermostat is installed
Terminals 13 and 14 are jumped if there is no ON/OFF receiver connected. When no remote thermostat is installed the
operating condition for the unit (Thermo ON/OFF) will be controlled by the water calculation control system.
b. Installation of the ATW-RTU-04
In case of setting an installation with 2 circuits (circuit 1 and circuit 2) and the same demand ON/OFF is used for both of
them, remove the jumper between terminals 13 and 14 of the Terminal board 2 and connect the RF receiver as shown in the
following picture.
13
60 PMML0510 rev.1 - 10/2019
Circuit 2
Jumper
14
7
6
T
wo2
2
1
1 2
H-LINK
ATW-RTU
Jumper
13 14
13 14
Common
Line
Demand ON/OFF
Receiver input 2
Thermostat requirements:
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Power supply: 230V AC
Contact voltage: 230V