Hitachi YUTAKI RWM-2R1E Installation & Operation Manual page 117

ELECTRICAL AND CONTROL SETTINGS
Mark Part name
37
Output 3 (Auxiliary boiler or electric
heater) (*)
38
39
Output 4 (Solar) (*)
40
?
N O T E
(*): Inputs and outputs explained in the table are the factory-set options. By means of the unit controller, some other inputs and outputs functions can
be configured and used. Please, refer to the Service Manual for detailed information.
7.4.2.4 Indoor/outdoor communication wiring (TB2) / ATW-RTU Communication / Central Devices
Communication
• The transmission is wired to terminals 1-2.
• The H-LINK II wiring system requires only two transmission cables that connect the indoor unit and the outdoor unit in case of split
system and also connect the indoor unit with ATW-RTU or Central devices like ATW-TAG-02, ATW-KNX-02 and ATW-MBS-02
• Use twist pair wires (0.75 mm²) for operation wiring between outdoor unit and indoor unit. The wiring must consist of 2-core wires
(Do not use wire with more than 3 cores).
• Use shielded wires for intermediate wiring to protect the units from noise interference, with a length of less than 300 m and a size
in compliance with local codes.
• In the event that a conduit tube for field-wiring is not used, fix rubber bushes to the panel with adhesive.
!
C A U T I O N
Ensure that the transmission wiring is not wrongly connected to any live part that could be damaged the PCB.
Input and output terminals give the possibility to configure the installation according to the needs of the user. The default settings
and I/O terminals reach most of the options necessary for an optimal performance of the system. Additionally, the settings can be
modified through the unit controller, and input/output terminals can be used, if required, to have additional options.
103 PMML0575 rev.2 - 03/2022
The boiler can be used to alternate with the heat pump when the heat pump cannot achieve the
required temperature by itself.
A water electric heater (as accessory) can be used to provide the additional heating required on
the coldest days of the year.
Output for solar combination with Domestic Hot Water Tank.
Indoor unit
1 2
Outdoor unit ATW-RTU /
1 2
Central Devices
Description