Hitachi YUTAKI S COMBI Series Installation And Operation Manual

46
PMEN0645 rev.0 - 04/2023
6
TERMINALBOARDCONNECTIONS
ELECTRICAL AND CONTROL SETTINGS
Mark
Part name
Descripon
18 Input 4 (Solar) (*) Available input for Solar combinaon with Domesc Hot Water Tank.
19 Input 5 (Smart funcon) (*)
For the connecon of an external tari switch device to switch OFF the
heat pump during peak electricity demand period. Depending on the
seng, the heat pump or DHWT will be blocked when signal is open/
closed.
20
Input 6 (DHW boost) (*)
Available input for an instantaneous heang of the domesc hot water of
the tank.
21 Input 7 (Power meter)
The measuring of the real power consumpon can be done connecng
an external power meter. The number of pulses of the power meter is
a variable which must be set. By this, every pulse input is added into
corresponding operaon mode (Heang, Cooling, DHW Operaon). Two
possible opons:
‑ One power meter for all installaon (IU+OU).
‑ Two separated power meters (one for IU and one for OU).
22
Aquastat security for circuit 1
(WP1)
Terminals intended for the connecon of the Aquastat security accessory
(ATW‑AQT‑01) for controlling water temperature of the circuit 1.
23
24(C) Mixing valve close
When a mixing system is required for a second temperature control, these
outputs are necessary to control the mixing valve.
25(O) Mixing valve open
26(N) N Common
27(L) Water Pump 2 (WP2)
When there is a second temperature applicaon, a secondary pump is the
circulang pump for the secondary heang circuit.
28
Auxiliary power Power supply for ATW‑RTU and central device
29
30(N)
Electrical Heater DHW Output
If DHW tank contains an electric heater, the air to water heat pump
can acvate it if the heat pump cannot achieve the required DHW
temperature by itself.
31(L)
32 Output 9
33(L) L common Power supply for valve accessories
34(N)
N common Neutral terminal common for outputs 1, 2 and 9.
35(L)
Output 1 (3‑way valve for
swimming pool) (*)
The air to water heat pump can be use to heat swimming pool. This
output will be ON when swimming pool is acvated.
36(L)
Output 2
(Water pump 3 (WP3)) (*)
When there is a hydraulic separator or buer tank, addional water pump
(WP3) is needed.
37
Output 3 (Auxiliary boiler or
electric heater) (*)
The boiler can be used to alternate with the heat pump when the heat
pump cannot achieve the required temperature by itself.
A water electric heater (as accessory) can be used to provide the
addional heang required on the coldest days of the year.
38
39
Output 4 (Solar) (*) Output for solar combinaon with Domesc Hot Water Tank.
40
 NOTE
(*): Inputs and outputs explained in the table are the factory-set opons. By means of the unit
controller, some other inputs and outputs funcons can be congured and used. Please, refer to the
Service Manual for detailed informaon.

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