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7
Water to Water Heat Pump (WTW)
1-zone temperature control
Control option A
This option features the main remote controller and the Mitsubishi
Electric wireless remote controller. The wireless remote controller
is used to monitor room temperature and can be used to make
changes to the space heating settings, boost DHW and switch to
holiday mode without having to directly use the main remote
controller.
If more than one wireless remote controller is used, the most
recently requested temperature setting will commonly be applied
to all rooms by the central control system regardless of which
wireless remote controller was used. No hierarchy exists across
these remote controllers.
Wire the wireless receiver to FTC referring to the wireless remote
controller instruction manual. Turn DIP SW1-8 to ON. Before
operation configure the wireless remote controller to transmit and
receive data referring to the wireless remote controller installation
manual.
Control option B
This option features the main remote controller and the Mitsubishi
Electric thermistor wired to FTC. The thermistor is used to
monitor room temperature but can not make any changes in
control operation. Any changes to DHW must be made using the
main remote controller mounted on the heat pump unit.
Wire the thermistor to the TH1 connector on FTC.
The number of room temperature thermistors that can be
connected to FTC is always one.
Control option C
This option features the main remote controller being removed
from the heat pump unit and situated in a different room. A thermis-
tor built in the main remote controller can be used for monitoring
the room temperature for Auto Adaptation function whilst keeping
all its features of the main remote controller available.
The main remote controller and FTC are connected by a 2-core,
0.3 mm², non-polar cable (local supply) with a maximum length of
500 m.
To use the sensor in the main remote controller the main remote
controller should come off from the heat pump unit. Otherwise it
will detect the temperature of the heat pump unit instead of room
temperature. This will affect the output of the space heating.
Note: Wiring for main remote controller cable shall be (5 cm or
more) apart from power source wiring so that it is not influ-
enced by electrical noise from power source wiring. (Do NOT
insert main remote controller cable and power source wiring
in the same conduit.)
Control option D
This option features the main remote controller and a locally
supplied thermostat wired to FTC. The thermostat is used to set
the maximum temperature for heating room. Any changes to
DHW must be made using main remote controller mounted on
the heat pump unit.
The thermostat is wired to IN1 in TBI.1 on FTC. The number of
thermostats that can be connected to FTC is always one.
The wireless remote controller can be also used as a
thermostat.
B-234
Wireless receiver
(option)
C.B
FTC
Main remote
controller
Heat pump unit
C.B
FTC
Room tempera-
ture thermistor
(option)
Main remote
controller
Heat pump unit
C.B
FTC
Heat pump unit
C.B
FTC
Main remote
controller
Heat pump unit
Wireless
remote controller
(option)
20.0°C
20.0°C
Max. 8
20.0°C
20.0°C
Room
Room
Main remote
controller
(remote position)
Room
20.0°C
Room tempera-
ture thermostat
(local supply)
Room
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