Hitachi YUTAKI Serie Installations- Und Betriebshandbuch Seite 121

ELECTRICAL AND CONTROL SETTINGS
Output terminals (Optional output functions)

3 Way valve for Swimming pool (Output 1)
YUTAKI units can be used to heat the water of a swimming pool. The signal is used on a 3-way motorized diverting valve and to
provide control of supply water flow (water flow for space heating when there is no signal, and water flow for swimming pool when
signal is ON). This output is available when the function is enabled from the Unit controller.
Using the appropriate wiring, connect the valve cables as shown in the previous picture.
33
(L)
Brown
!
C A U T I O N
Only 3-way type valve can be connected:
• Spring return 2-wire type 3-way valve: the 3-way valve should be fitted when normally working (not power to the valve). Normally diverts to heating
circuit side.
• When using SPST 3-wire valve, HITACHI is not responsible for its operation.

Water pump 3 (Output 2)
When the boiler is configured with the heat pump or needs an additional pump for the system, a hydraulic separator or buffer tank
must be used to ensure a correct hydraulic balance

Auxiliary boiler or heater (Output 3)
The auxiliary boiler or heater can be used when the heat pump cannot achieve the require temperature by itself. A water electric
heater (as accessory) can be used to provide the additional heating required on coldest days of the year.

Solar (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.
109 PMML0335A rev.1 - 04/2016
34 35
(N) (C)
Blue
M
Black
3WV / SWP
Output 1
34
(N)
39
Auxiliary Heat
(Output 3)
39
Valve requirements:
•
Power supply: 230V AC 50Hz
•
Maximum running current: 100mA
36
(L)
M
Water pump III
(Output 2)
40
40
Solar (out)
(Output 4)