Indoor Fan Motor Protection - Mitsubishi Electric FDT125VNVF Technical Manual

(8)

Indoor fan motor protection

When the air conditioner is operating and the indoor fan motor is turned ON, if the indoor fan motor has operated at 300 rpm or
under for more than 30 seconds, the unit enters first in the stop mode and then stops the entire system.
(9) Serial signal transmission error protection
(a) Purpose: Prevents malfunction resulting from error on the indoor ↔ outdoor signals.
(b) Detail of operation: If the compressor is operating and a serial signal cannot be received from the indoor control with outdoor
(10) Plural unit control – Control of 16 units group by one remote controller
(a) 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 SW1 on the interface PCB. Unit No. setting by SW1 is necessary for the interface only. In cases of the twin and triple
specification, it is necessary set for the master and the slave units. This can be selected by SW3. (All are set for the master unit at the shipping
from factory.)
SW1: For setting of 0 – 9, A – F
SW3: For setting of master and slave units
(See table shown at right.)
Signal wiring
between outdoor unit
and indoor units
Indoor unit
Connection cable
Interfase kit
(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.
(b) Display to the remote controller
1) 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.
2) Inspection display: Any of unit that starts initially is displayed.
3) 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.
control having serial signals continues for 7 minute and 35 seconds, the compressor is stopped. After the
compressor has been stopped, it will be restarted after the compressor start delay if a serial signal can
be received again from the indoor control.
SW3 setting (For interface PCB)
Unit
Master
Slave1
Slave2
Outdoor unit
* 1 * 1 * 1
0 1 2
Remote controller wiring
R
Remote controller
-
Switch
SW3-1 SW3-2
OFF OFF
OFF ON
ON OFF
Refrigerant piping
(Master unit) (Slave unit 1) (Slave unit 2)
* 2 * 2 * 2
* 1
4 5 6
3
(Master) (Slave 1) (Slave 2)
315
-
'12 • PAC-T-174
* 1
F
* 1:In case of SRK, SRF single use.
* 2:In case of SRK triple use.