Hitachi YUTAKI ATW-YCC-03 Installation And Operation Manual page 49

Mark Part name
19 Input 5 (Smart function) (*)
20 Input 6 (DHW boost) (*)
21 Input 7 (Power meter)
24(C) Mixing valve close
25(O) Mixing valve open
26(N) N Common
27(L) Water Pump 2 (WP2)
28
Auxiliary power
29
30(N)
Electrical Heater DHW Output
31(L)
32(C) Control line
33(L) 3-way valve for DHW tank
34(N) N common
Output 1 (3-way valve for
35(L)
swimming pool) (*)
Output 2 (Water pump 3 (WP3))
36(L)
(*)
37
Output 3 (Auxiliary boiler or
electric heater) (*)
38
39
Output 4 (Solar) (*)
40

NOTE
(*): Inputs and outputs explained in the table are the factory-set options. By means of the
unit controller, some other inputs and outputs functions can be configured and used. Refer to
the YUTAKI and the PC-ARFH2E technical documentation and operation manual for detailed
information.
PMEN0581 rev.2 - 04/2023
For the connection of an external tariff switch device to switch OFF the
heat pump during peak electricity demand period. Depending on the
setting, the heat pump or DHWT will be blocked when signal is open/
closed.
Available input for an instantaneous heating of the domestic hot water of
the tank.
The measuring of the real power consumption can be done connecting
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 operation mode (Heating, Cooling, DHW Operation). Two
possible options:
One power meter for all installation (IU+OU).
Two separated power meters (one for IU and one for OU).
When a mixing system is required for a second temperature control,
these outputs are necessary to control the mixing valve.
When there is a second temperature application, a secondary pump is the
circulating pump for the secondary heating circuit.
Power supply for ATW-RTU and central device
If DHW tank contains an electric heater, the air to water heat pump
can activate it if the heat pump cannot achieve the required DHW
temperature by itself.
Control terminal for the 3-way valve for DHW tank.
The air to water heat pump can be used to heat DHW. This output will be
on when DHW is activated.
Neutral terminal common for 3-way valve of DHW tank and outputs 1 and
2.
The air to water heat pump can be use to heat swimming pool. This
output will be ON when swimming pool is activated.
When there is a hydraulic separator or buffer tank, additional water pump
(WP3) is needed.
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
additional heating required on the coldest days of the year.
Output for solar combination with Domestic Hot Water Tank.
Description
5
43