Mitsubishi Heavy Industries V Multi FDC71VNX Technical Manual page 109

(17) Plural unit control – Control of 16 units group by one remote control
(a) Function
One remote control can control a group of multiple number of unit (Max. 16 indoor units). "Operation mode" which
is set by the remote control can operate or stop all units in the group one after another in the order of unit. No.
Thermostat and protective function of each unit function independently.
Note (1) Unit No. is set by SW2 on the indoor control PCB. Unit No. setting by SW2 is necessary for the indoor unit only. In cases of the twin, triple and
double twin specifi cation, 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.)
Signal wiring
between outdoor unit
and indoor units
(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 control
(i) Central or each remote control basis, heating preparation: the smallest unit No. among the operating units in the
remote mode (or the center mode unless the remote mode is available) is displayed.
(ii) Inspection display, fi lter sign: Any of unit that starts initially is displayed.
(c) Confirmation of connected units
(i) In case of RC-EX3A remote control
If you touch the buttons in the order of "Menu" → "Service setting" → "Service & Maintenance" → "Service
password" → "IU address" on the TOP screen of remote control, the indoor units which are connected are displayed.
(ii) In case of RC-E5 remote control
Pressing "AIR CON No." button on the remote control displays the indoor unit address. If "▲" "▼" button is
pressed at the next, it is displayed orderly starting from the unit of smallest No.
(d) In case of anomaly
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.
(e) 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, connect the remote control wiring to each indoor unit via terminal block for the remote control.
Connect the remote control wiring separately from the power source cable or wires of other electric devices (AC220V
or higher).
(18) High ceiling control
When suffi cient air fl ow rate cannot be obtained from the indoor unit which is installed at a room with high ceiling, the air
fl ow rate can be increased by changing the fan tap. To change the fan tap, use the indoor unit function "FAN SPEED SET"
on the wired remote control.
Fan tap
STANDARD
FAN SPEED SET
HIGH SPEED1
HIGH SPEED2
Notes (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.
(3) This function is not able to be set with wireless remote controls or simple remote control (RCH-E3)
Outdoor unit
0
1 2
Indoor unit
R
Remote control
Indoor unit air flow setting
- - -
P-Hi2 - Hi - Me - ULo
P-Hi2 - P-Hi1 - Hi - Me
P-Hi2 - Hi - Me - ULo
108
-
SW5 setting
Switch
SW5-1 SW5-2
Unit
OFF OFF
Master unit
Slave unit a
OFF ON
Slave unit b ON OFF
Slave unit c
ON ON
Refrigerant piping
4 4
3
(Master unit) (Slave unit a) (Slave unit b)
Remote control wiring
- - -
Hi - Me - Hi - Me - Hi - Me - ULo Hi - Me - ULo ULo ULo Hi - ULo Hi - Me
P-Hi1 - Hi - Me P-Hi1 - Me
Hi - Me - ULo Hi - ULo Hi - Me
-
'19 • PAC-T-327
4 4
(Slave unit c)
-
P-Hi1 - Hi
(1) .
F