Hitachi ATW-RTU-06, smart wireless room thermostat for heat pump (Yutaki S), for second zone temperature control.
When the heat pump works with a simple thermostat, it is alerted to the achievement of the desired temperature in the room when it has already been achieved, and after it has been achieved, while it does not know any other information than whether the room has the desired temperature or not.
With the addition of the wireless room unit, the pump is constantly aware of the actual temperature in the room, so it is able to calculate e.g. how long it will take to reach the desired temperature, so that the pump adjusts its operation earlier, to be able to accurately set the desired temperature.
The prerequisite is the presence of an ATW-RTU-05 thermostat.
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