Hitachi YUTAKI S COMBI Series Installation And Operation Manual

51
PMEN0645 rev.0 - 04/2023
6
TERMINALBOARDCONNECTIONS
ELECTRICAL AND CONTROL SETTINGS
◆ Aquastat for circuit 1
Aquastat is a security accessory to control in order to prevent high water temperature entering
into oor system (Circuit 1). This devices must be connected to terminals 22 & 23 for circuit 1.
When this devices is acvated because of the high temperature of the water, it stops the water
pump in order to stop the ow of water to the heang oor.
22 23
C
Second
Aquastat
1
Circuit 1 (for WP)
In case of YUTAKI S Combi UK model, Domesc Hot water tank security thermostat its connected
to terminals 22 & 23 and this funcion is not available for circuit 1.
Output terminals (Default output funcons)
◆ Mixing valve for Circuit 2
The mixing valve is controlled to maintain the second heang temperature at the second heang
temperature set point. The control system decides how much to open or close the mixing valve to
achieve the desired posion of the valve.
24 25 26
M
(C)
(O)
(N)
Brown
Black
Blue
Mixing Valve
(Circuit 2)
Terminal Name Descripon
24 C Close
25 O Open
26 N Neutral
Valve requirements:
• Power supply: 230V AC 50Hz
• Maximum running current: 100mA

Hitachi YUTAKI S COMBI Series Specifications

General

Type	Air-to-Water Heat Pump
Energy Efficiency Class (Cooling)	A++
Refrigerant	R32
Operating Temperature Range (Heating)	-20°C to 35°C
Energy Efficiency Class (Heating)	A+++
Integrated DHW Tank	190 liters
Dimensions (Indoor Unit)	Varies by model
Dimensions (Outdoor Unit)	Varies by model
Weight (Indoor Unit)	Varies by model
Weight (Outdoor Unit)	Varies by model
Operating Temperature Range (Cooling)	+10°C to +46°C