Hitachi RAS-3WHVRP Technical Catalogue

9 Electrical and control settings
Optional indoor unit wiring (accessories)
TCGB0123 rev.2 - 10/2019
116
Mark Part name Description
28
YUTAKI M: Auxiliary power
YUTAKI S / S COMBI: Aquastat
security for circuit 2 (WP2)
YUTAKI M: Power supply for ATW-RTU and central device
NEW
YUTAKI S / S COMBI: Terminals intended for the connection of the Aquastat security
accessory (ATW-AQT-01) for controlling water temperature of the circuit 2.
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) Common line Common terminal for the 3-way valve for DHW tank.
33(L) 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.
34(N) N common Neutral terminal common for 3-way valve of DHW tank and outputs 1 and 2.
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 activated.
36(L)
Output 2 (Water pump 3 (WP3))
(*)
When there is a hydraulic separator or buffer 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.

Hitachi RAS-3WHVRP Specifications

General

Brand	Hitachi
Model	RAS-3WHVRP
Category	Heat Pump
Language	English