Hitachi YUTAKI S80 R410A Series Installation And Operation Manual page 73

Output terminals (Default output functions)
◆ Mixing valve for Circuit 2
The mixing valve is controlled to maintain the second heating temperature at the second heating
temperature set point. The control system decides how much to open or close the mixing valve to
achieve the desired position of the valve.
24
(C)
Black
Brown
Mixing
Valve
(Circuit 2)
Water pump 2 Circuit 2
◆
In case of a second circuit installation (second temperature level) the secondary pump is the
circulating pump for the second heating temperature.
26
(N)
M
Water pump II
(Circuit 2)
◆ Electrical heater DHWT output
In those cases where a DHW tank is installed with an electrical heater, the Air to Water heat pump
can activate the electric heater of the tank when the heat pump cannot achieve the required DHW
temperature by itself.
!
CAUTION
When using a DHW tank other than those from Hitachi, the maximum connectable heater load is
3 kW (connected to TB2 terminals 30-31).
PMEN0648 rev.0 - 03/2023
25 26
(O) (N)
M
Blue
27
(L)
30
(N)
Terminal
24
25
26
Valve requirements:
• Power supply: 230V AC 50Hz
• Maximum running current: 100mA
Pump requirements:
• Power supply: 230V AC 50Hz
• Maximum running current: 500mA (An
auxiliary relay must be installed in case of high
consumption of the water pump).
31
(L)
Electrical
≤ 3kW
Heater
DHWT (EH )
4
Name Description
C Close
O Open
N Neutral
6
64