Note: The above dip switches are correlative to the system security, so please confirm the
conformity between the unit and the dip switch. The incorrect dip switch setting will result
in the system wrong operation or the wrong failure diagnosis.
2. Cooling operation
2.1 The set temperature in cooling: TS=the set temp. on remote controller
2.2 After cooling startup, indoor unit will send the frequency code to outdoor according to
the temp. difference between the set temp. and the ambient temp.
3. Heating operation
3.1 In heating operation, the set temp. TS=the set temp. on remote controller
3.2 After heating startup, indoor unit will send the frequency code to outdoor according to
the temp. difference between the set temp. and the ambient temp.
4. Dry operation
Room temp.-(set temp.+ tolerance)
＞
2
℃
, indoor operation is identical to the cooling
operation, and sends the cooling operation signal to outdoor.
Room temp.-(set temp.+ tolerance)
≤
2
℃
, indoor unit sends the dry operation signal to
outdoor.
Room temp.
＜
16
℃
, indoor unit stops running and sends stop-unit signal to outdoor.
5. Fan operation
Indoor fan motor will run as the fan speed set on the remote controller and indoor unit will
send the stop-unit signal to outdoor.
6. Auto operation
If the unit enters Auto mode for the first time, the system will adjust the operation mode
according to the room temp. and the set temp.
When room temp.
≥
set temp., entering cooling mode;
When room temp.
＜
set temp., entering heating mode.
Mode conversion will be confirmed after compressor has stopped for 15 minutes.
7. Abnormal operation
When outdoor modes from the request of indoor unit conflict, the one entering firstly will
take priority.
After indoor receives the ON command from remote controller, it will firstly confirm the
outdoor current operation mode. If they are the same mode, indoor unit will run as the
request of remote controller. If they are different modes, the system will forbid to operate,
and indoor will keep the OFF mode. After setting on remote controller, if the buzzer
sounds two times, that shows abnormal operation. Indoor will run until the outdoor mode
and the requested mode of remote controller are the same.
8. Compensation control for discontinuous operation
After the unit starts up in cooling/heating mode, in 3 minutes, the compressor run/stop will
not be controlled by the room temp., but after changing the set temp., if compressor stop
condition can be met, the system will stop compressor immediately.
9. Anti-cold air control
In heating mode, after compressor startup, the system will control indoor fan motor
according to indoor coil temperature. At the beginning of startup, the indoor fan motor can
run only when indoor mid-coil temp. is over 28
℃
(
±
2
℃)
. When indoor mid-coil temp.
goes down to 18
℃
(
±
2
℃)
, indoor fan motor will stop running.
-56-
Commercial Air Conditioner
Model: AU18
/22
2XFERA
AS072/092/122XVERA
