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(5)
Outline of heating or cooling operation
(a)
Operation of major functional components in heating mode
Compressor
Indoor fan
Outdoor fan
4-way valve
(b) Operation of major functional components in cooling mode
Compressor
Indoor fan
Outdoor fan
4-way valve
(6)
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.
(7)
Serial signal transmission error protection (Only SRK-ZSX series)
(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
signals continues for 7 minutes and 35 seconds, the compressor is stopped. After the compressor has been stopped, it will be re-
started after the compressor start delay if a serial signal can be received again from the indoor control.
(8)
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
No.
(1)
. 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.)
Heating
Thermostat ON
Thermostat OFF
ON
ON
ON(HOT KEEP)
ON
(few minutes ON)
ON
Cooling
Thermostat ON
Thermostat OFF
ON
ON
ON
(few minutes ON)
OFF
SW3 setting (For interface PCB)
Switch
SW3-1
Unit
Master
Slave1
Slave2
35
-
-
Failure
OFF
OFF
OFF
OFF
OFF
OFF
ON
(3 minutes ON)
Failure
OFF
OFF
ON
OFF
OFF
OFF
(few minutes ON)
OFF
OFF
SW3-2
OFF
OFF
OFF
ON
ON
OFF
'19 • PAC-SM-309
-1
or
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Troubleshooting
