Hitachi YUTAKI S80 R410A Series Installation And Operation Manual page 64

Mark
18 Input 4 (Solar) (*)
19 Input 5 (Smart function) (*)
20 Input 6 (DHW boost) (*)
21 Input 7 (Power meter)
22
Aquastat security for circuit 1 (WP1)
Limit thermostat
23
24(C) Mixing valve close
25(O) Mixing valve open
26(N) Common line
27(L) Water Pump 2 (WP2)
28
Aquastat security for circuit 2 (WP2)
29
30(N)
Electrical Heater DHW Output
31(L)
32(C) 3‑way valve for DHW tank (output)
33(L) Common line (phase)
34(N) N common (neutral)
35(L) Output 1 (3‑way valve for swimming pool) (*)
36(L) Output 2 (Water pump 3 (WP3)) (*)
PMEN0648 rev.0 - 03/2023
Part name Description
Available input for Solar combination with Domestic
Hot Water Tank.
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).
Terminals intended for the connection of the
Aquastat security accessory (ATW‑AQT‑01) for
controlling water temperature of the circuit 1.
When a mixing system is required for a second
temperature control, these outputs are necessary to
control the mixing valve.
Terminal line common for mixing valve and water
pump 2.
When there is a second temperature application,
a secondary pump is the circulating pump for the
secondary heating circuit.
Terminals intended for the connection of the
Aquastat security accessory (ATW‑AQT‑01) to
control the water temperature of the circuit 2.
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.
The air to water heat pump can be used to heat
DHW. This output will be on when DHW is activated.
Common terminal for the 3‑way valve for DHW tank.
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.
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