Hitachi YUTAKI M RASM-3WF2E Installation And Operation Manual page 41

Mark Part name
20 Input 6 (DHW boost) (*)
21 Input 7 (Power meter)
22
Aquastat security for circuit 1
(WP1)
23
24(C) Mixing valve close
25(O) Mixing valve open
26(L2) Common line
27(L1) Water Pump 2 (WP2)
28
Auxiliary power
29
30(L2)
Electrical Heater DHW Output
Control
31(L1)
32(C) 3-way valve for DHW tank
33(L1) Line
34(L2) Common line
Output 1 (3-way valve for
35(C)
swimming pool) (*)
Output 2 (Water pump 3 (WP3))
36(L1)
(*)
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. Please, refer to the
Service Manual for detailed information.
PMEN0657 rev.0 - 02/2024
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).
Terminals intended for the connection of the Aquastat security (field
supplied) 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.
Not used
If the DHW tank is equipped with an electric heater, the air-to-water
heat pump can engage it in case the heat pump alone cannot reach the
necessary DHW temperature. This signal is intended for controlling the
operation of the DHW Heater and should NOT be used to connect the
main power for the DHW Heater.
The air to water heat pump can be used to heat DHW. This output will be
ON when DHW is activated.
Line terminal for the 3-way valve for DHW tank and swimming pool.
Terminal line 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 (field supplied) 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
6
40