Hitachi YUTAKI M RASM-3WF2E Installation And Operation Manual page 50

◆ Auxiliary boiler or heater (Default for Output 3)
The auxiliary boiler or heater can be used when the heat pump cannot achieve the require
temperature by itself.
◆ Solar (Default for output 4)
This output is used when solar mode is enabled (from Unit controller) and the temperature in
the solar panel rises above the water temperature in the domestic hot water tank (DHWT). The
connection between terminals 39 and 40 shall be closed in order to activate the dedicated water
pump for solar panel combination.
PMEN0657 rev.0 - 02/2024
37 38
Auxiliary Heat
(Output 3)
39 40
Solar
(Output 4)
6
49