Hitachi YUTAKI S COMBI Series Installation And Operation Manual page 61

◆ 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).
◆ Output 9
PMEN0645 rev.0 - 04/2023
27
(L)
Pump requirements:
• Power supply: 230V AC 50Hz
• Maximum running current: 500mA (An auxiliary
30
(N)
32
(N)
relay must be installed in case of high consumption
of the water pump).
31
(L)
Electrical Heater
DHWT (EH ) ≤ 3kW
4
34
33
(L)
6
52