Hitachi RWM-(H)FSN3E Technical Catalogue page 134

10 Electrical wiring

Terminal board connections
134
TCGB0070 rev.3 - 04/2012
Mark Part name
N
AC 230V
L1
AC 400V Main power supply connection
L2
-
L3
1
Indoor/Outdoor commu-
tation cables
2
3
Opentherm communica-
tion cables
4
5
Optional ON/OFF Room
thermostat
6
7 L Common
8 Swimming pool input
9 Tariff switch input
10 Solar input
Domestic Hot Water
11
valve
12 N common
13 Swimming pool valve
14 Earth Connection
15 Mixing valve close
16 Mixing valve open
17 N Common
18 Water Pump 2 (WP2)
19
Water Pump 3 (WP3)
20
21
Boiler output
22
23
Electrical Heater DHW
Output
24
25
Solar output
26
27 DHW thermistor
28 Common thermistor
Water outlet boiler
29
(THMwo3)
30
Water outlet C2 thermis-
tor (THMwo2)
31
32(+)
Second ambient ther-
mistor
33(-)
34(+)
Swimming pool ther-
mistor
35(-)
Description
TERMINAL BOARD 1 (TB1)
TERMINAL BOARD 2 (TB2)
The H-LINK transmission between outdoor unit and indoor unit is
wired to terminals 1-2.
Only for Intelligent Room thermostat accessory: The receiver is
connected to the polarity-free terminals A/B.
The air to water heat pump system has been designed to allow
the connection of a remote thermostat to effectively control your
home's temperature. Depending on the room temperature, the
thermostat will turn the air to water heat pump system ON and
OFF. You will also be able to program the on and off times and
achieve intelligent consumption levels.
Terminal Line common for swimming pool, tariff switch or solar
input accessory.
Only for swimming pool installations: It is necessary to connect an
external input to the air to water heat pump to provide signal when
Water pump of Swimming pool is ON.
If a tariff–switching device is provided by the electricity utility, it can
be used to prevent the heat pump switching ON.
Available input for Solar combination with Domestic Hot Water
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 accessory devices.
The air to water heat pump can be use to heat Swimming pool.
This output will be on when Swimming pool is activated.
Terminal earth connection for accessories.
When a mixing system is required for a second temperature con-
trol, these two outputs are necessary to control de mixing valve.
When there is a second temperature application, a secondary
pump is the circulating pump for the secondary heating loop.
When there is a hydraulic separator or buffer tank, additional Water
pump (WP3) is needed.
The boiler can be used when the heat pump cannot achieve the
required temperature itself.
If DHW Storage tank contains an electric heater, the air to water
heat pump can enable it if the heat pump cannot achieve the requi-
red DHW temperature itself.
Output for solar combination with Domestic Hot Water Tank.
The DHW sensor is used to control the domestic hot water storage
tank.
Common terminal for thermistor.
Water sensor for boiler combination.
The sensor is used for the second temperature control and should
be positioned after the mixing valve and the circulation pump.
The sensor is used for the second ambient temperature control
and should be positioned outside
The sensor is used for the swiming pool temperature control and
should be positioned inside plate HEX of swimming pool