Mitsubishi Heavy Industries FDT71VNXVD Service Manual page 10

(p) Anomalous fan motor [In case of FDT only]
After starting the fan motor, if the fan motor speed is 200rpm or less is detected for 30 seconds continuously and 4 times within
60 minutes, then fan motor stops with the anomalous stop (E16).
(q) Plural unit control – Control of 16 units group by one remote controller
1) Function
One remote controller switch can control a group of multiple number of unit (Max. 16 indoor units). "Operation mode"
which is set by the remote controller switch can operate or stop all units in the group one after another in the order of unit
(1)
No. . Thermostat and protective function of each unit function independently.
Note (1) Unit No. is set by SW2 on the indoor unit control PCB. Unit No. setting by SW2 is necessary for the indoor unit only. In cases of the twin, triple
and double-twin specification, it is necessary set for the master and the slave units. This can be selected by SW5. (All are set for the master unit at
the shipping from factory.)
SW2: For setting of 0 – 9, A – F
SW5: For setting of master and slave units
(See table shown at right.)
Outdoor unit
Signal wiring
between outdoor unit
and indoor units
Indoor unit
(2) Unit No. may be set at random unless duplicated, it should be better to set orderly like 0, 1, 2..., F to avoid mistake.
2) Display to the remote controller
a) Center or each remote controller basis, heating preparation: the youngest unit No. among the operating units in the
remote mode (or the center mode unless the remote mode is available) is displayed.
b) Inspection display, filter sign: Any of unit that starts initially is displayed.
c) Confirmation of connected units
Pressing "AIR CON No." button on the remote controller displays the indoor unit address. If " " " " button is
pressed at the next, it is displayed orderly starting from the unit of youngest No.
d) In case of anomaly
i) If any anomaly occurs on a unit in a group (a protective function operates), that unit stops with the anomalous
stop but any other normal units continue to run as they are.
ii) Signal wiring procedure
Signal wiring between indoor and outdoor units should be made on each unit same as the normal wiring.
For the group control, lay connect with sires wiring between rooms using terminal blocks (X, Y) of remote
controller.
Connect the remote controller communication wire separately from the power supply wire or wires of other
electric devices (AC220V or higher).
(r) High ceiling control
In the case of indoor unit installed in a higher ceiling room, the airflow volume mode control can be changed with the wired
remote controller indoor unit function "FAN SPEED SET".
Fan tap
STANDARD
FAN SPEED SET
HIGH SPEED1, 2
Note (1) Factory default is Standard.
(2) At the hot-start and heating thermostat OFF, or other, the indoor unit fan is operated at the low speed tap of each setting.
SW5 setting
Switch
Unit
Master unit
Slave unit a
Slave unit b
Slave unit c
0 1 2 3
Remote controller wiring
R
Remote controller
- - -
UH - Hi - Me - Lo
UH - UH - Hi - Me
-
SW5-1 SW5-2
OFF OFF
OFF ON
ON OFF
ON ON
Refrigerant piping
4 4 4 4
(Master unit) (Slave unit a) (Slave unit b) (Slave unit c)
Indoor unit airflow setting
- - -
Hi - Me - Lo Hi - Lo
UH - Hi - Me UH - Me UH - Hi
-
10
'10 • PAC-SM-137A
F
-
Hi - Me