Hitachi YUTAKI M R32 Series - Page 67

67
PMML0600 rev.0 - 06/2022
6
OPTIONAL UNIT WIRING FOR ACCESSORIES
ELECTRICAL AND CONTROL SETTINGS
Mark
Part name
Description
18
Input 4 (Solar) (*)
Available input for Solar combination with Domestic Hot Water Tank.
19 Input 5 (Smart function) (*)
For the connection of an external tari 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.
20 Input 6 (DHW boost) (*)
Available input for an instantaneous heating of the domestic hot water of
the tank.
21 Input 7 (Power meter)
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).
22
Aquastat security for circuit 1
(WP1)
Terminals intended for the connection 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)
Common line
Terminal line common for mixing valve and water pump 2.
27(L) Water Pump 2 (WP2)
When there is a second temperature application, a secondary pump is the
circulating pump for the secondary heating 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
activate it if the heat pump cannot achieve the required DHW temperature
by itself.
31(L)
32(C) 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.
33(L)
Line
Line terminal for the 3-way valve for DHW tank and swimming pool.
34(N)
Common line
Terminal line common for 3-way valve of DHW tank and outputs 1 and 2.
35(C)
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 activated.
36(L)
Output 2 (Water pump 3 (WP3))
(*)
When there is a hydraulic separator or buer tank, additional 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 additional
heating required on the coldest days of the year.
38
39
Output 4 (Solar) (*) Output for solar combination with Domestic Hot Water Tank.
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 congured and used. Please, refer to the
Service Manual for detailed information.