Indoor Fan Motor Protection; Serial Signal Transmission Error Protection; Plural Unit Control - Control Of 16 Units Group By One Remote Control - Mitsubishi Heavy Industries SRK100VNXPZSX Technical Manual

(7)

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 min
under for more than 30 seconds, the unit enters first in the stop mode and then stops the entire system.
(8)

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 control having serial sig-
nals 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.
(9) Plural unit control – Control of 16 units group by one remote control
(a) Function
One remote control switch can control a group of multiple number of unit (Max. 16 indoor units). "Operation mode"
which is set by the remote control 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 control
(i) Center or each remote control 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.
(ii) Inspection display, filter sign: Any of unit that starts initially is displayed.
(iii) Confirmation of connected units
1) In case of RC-EX3 remote control
If you touch the buttons in the order of "Menu" → "Next" → "Service & Maintenance" → "IU address" on the
TOP screen of remote control, the indoor units which are connected are displayed.
2) 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 youngest No.
SW3 setting (For interface PCB)
Switch
Unit
Master
Stave1
Stave2
Outdoor unit
* 1 * 1 * 1
0 1 2
Remote control wiring
R
Remote control
-
SW3-1 SW3-2
OFF OFF
OFF ON
ON OFF
Refrigerant piping
(Master unit) (Slave unit 1) (Slave unit 2)
* 1 * 2 * 2 * 2
4 4 4
3
(Master) (Slave 1) (Slave 2)
69
-
'17 • PAC-T-257
* 1
F
* 1:In case of SRK single use.
* 2:In case of SRK triple use.
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