10. Electrical wiring
TCGB0075 rev.0 - 11/2012
117
10
10.2.2 Indoor unit terminal board connections
Mark
Part name
Description
TERMINAL BOARD 1 (TB1)
N
1~ 230V 50Hz
3N~ 400V
50Hz
L1
L2
-
L3
TERMINAL BOARD 2 (TB2)
1
Indoor/Outdoor commuta-
tion cables
The H-LINK transmission between outdoor unit and indoor unit is wired to
terminals 1-2.
2
3
Opentherm communication
cables
Only for Intelligent Room thermostat accessory: The receiver is connected to
the polarity-free terminals A/B.
4
5
Optional ON/OFF Room
thermostat
The air to water heat pump system is 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.
6
7
L Common
Terminal Line common for swimming pool, tariff switch, solar input and DHW
Valve accessory.
8
Swimming pool input
Only for swimming pool installations: It is necessary to connect an external
input to the heat pump to provide signal when water pump of swimming pool
is ON.
9
Tariff switch input
If a tariff–switching device is provided by the electricity utility, it can be used
to prevent the heat pump switching ON.
10
Solar input
Available input for Solar combination with Domestic Hot Water Tank.
11
Domestic Hot Water valve The air to water heat pump can be used to heat DHW. This output will be ON
when DHW is activated.
12
N common
Neutral terminal common for accessory devices.
13
Swimming pool valve
The air to water heat pump can be used to heat Swimming pool. This output
will be ON when Swimming pool is activated.
14
Earth Connection
Terminal earth connection for accessories.
15
Mixing valve close
When a mixing system is required for a second temperature control, these
two outputs are necessary to control the mixing valve.
16
Mixing valve open
17
N Common
18
Water Pump 2 (WP2)
When there is a second temperature application, a secondary pump is the
circulating pump for the secondary heating loop.
19
Water Pump 3 (WP3)
When there is a hydraulic separator or buffer tank, additional Water pump
(WP3) is needed.
20
21
Common boiler/water
electric heater
Terminal line common for combination with boiler or water electric heater.
22
Boiler/Water electric heater
step 1 output
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.
23
Water electric heater step
2 output
24
Electrical Heater DHW
output
If DHW Storage tank contains an electric heater, the air to water heat pump
can enable it if the heat pump cannot achieve the required DHW temperature
itself.
25
26
Solar output
Output for solar combination with Domestic Hot Water Tank.
27
28
DHW thermistor
The DHW sensor is used to control the domestic hot water storage tank.
29
Common thermistor
Common terminal for thermistor.
30
Water outlet boiler thermis-
tor (THMwo3)
Water sensor for boiler combination.
31
Water outlet C2 thermistor
(THMwo2)
The sensor is used for the second temperature control and should be positio-
ned after the mixing valve and the circulation pump.
32
33
Second ambient thermistor The sensor is used for the second ambient temperature control and should
be positioned outside.
34(+)
Common thermistor
Common therminal for second ambient and swimming pool thermistor
(+12Vcc).
35
Swimming pool thermistor The sensor is used for the swiming pool temperature control and should be
positioned inside plate HEX of swimming pool.