Mitsubishi Heavy Industries FDT71VNXVD Service Manual page 13

3) Remote operation
a) In case of multiple units (Max. 16 indoor units group) are connected to one wired remote
controller
When the indoor function setting of wired remote controller for "External control set" is changed from "Individual
(Factory default)" to " For all units", all units connected in one wired remote controller system can be controlled by
external operation input.
Outdoor unit
①
123
Signal &
Power
External
input
123
XY
Indoor unit
①
XY
Wired remote controller
CnT-6
When more than one indoor unit (Max. 16 indoor units) are connected in one wired remote controller system:
(1) With the factory default, external input to CnT-6 is effective for only the unit ① .
(2) When setting "For all unit" (Local setting), all units in one remote controller system can be controlled by external
input to CnT-6 on the indoor unit ① .
(3) External input to CnT-6 on the other indoor unit than the unit ① is not effective.
(v) Fan control at heating startup (Applicable model: FDT)
1) Start conditions
At the start of heating operation, if the difference of setting temperature and return air temperature is 5°C or higher after
the end of hot start control, this control is performed.
2) Contents of control
a) Sampling is made at each minute and, when the indoor unit heat exchanger temperature (detected with Th
37°C or higher, present number of revolutions of indoor unit fan speed is increased by 10min
b) If the indoor unit heat exchanger temperature drops below 37°C at next sampling, present number of revolutions of
indoor unit fan speed is reduced by 10min
3) End conditions
Indoor fan speed is reduced to the setting airflow volume when the compressor OFF is established and at 30 minutes after
the start of heating operation.
Outdoor unit Outdoor unit Outdoor unit
② ③ ④
123 123 123
123 123 123
XY XY XY
Indoor unit Indoor unit
Indoor unit
② ③
④ (master)
Ex. Indoor units = ①＋②＋③＋④ｘ４＋......Ⓝ ≦16 units
Individual operation (Factory default)
ON OFF
Only the unit Only the unit
directly connected directly connected
to the remote to the remote
controller can be controller can be
operated. stopped opeartion.
Unit ① only Unit ① only
-1
.
-
Refrigerant piping
123 123 123
XY XY XY
Indoor unit
Indoor unit Indoor unit
④ (slave)
④ (slave) ④ (slave)
All units operation (Local setting)
ON
All units in one
remote controller
system can be
operated.
Units ①−Ⓝ
13 -
'10 • PAC-SM-137A
Outdoor unit
Ⓝ
123
123
XY
Indoor unit
Ⓝ
OFF
All units in one
remote controller
system can be
stopped operation.
Units ①−Ⓝ
-R) is
I
-1
.