49
Technical Information
Service Manual
6.3 Brief Description of Modes and Functions
1. Summary
(1) Buzzer
When the controller is energized or receives signal from button
(emergency operation switch on air conditioner) or remote control-
ler, the buzzer will give out a beep.
(2) Temperature parameter
◆
Indoor set temperature (Tpreset)
◆
Indoor ambient temperature (Tamb.)
◆
Inner tube temperature of indoor evaporator (Ttube)
2. Introduction of Basic Mode Function
◆
Once the compressor is energized, there should be a minimum
interval of 3 mins between two start-ups.
◆
If the unit is with memory function and is off before power
failure, the compressor can be restarted without an interval of 3
mins; if the
◆
Unit is on before power failure, the compressor will
be restarted with an interval of 3 mins.
Once compressor is started, it wont stop within 6 mins according
to the change of room temp.
(1) Auto mode
①
Operation condition and process for auto mode
Under auto mode, the system will automatically select operation
mode (cooling, heating and fan) according to indoor ambient
temperature. There swill be 30s delayed for protection between
mode switchover.
◆
When Tamb≥26
℃
, unit will be in cooling mode Ex-factory set
temperature is 25
℃
.
◆
Cooling and heating unit: When Tamb≤(19
℃
+Tcompensation),
unit will be in heating mode Tpreset=20
℃
.
◆
Cooling only unit: When Tamb≤22
℃
(or 72
℉
), unit will be in
fan mode Tpreset=25
℃
.
◆
For cooling and heating unit under condition that
(19
℃
+Tcompensation)
＜
Tamb
＜
26
℃
(For cooling only unit
under condition that 22
℃＜
Tamb
＜
26
℃
), when unit is initially
turned on in auto mode, it will operate according to auto fan
mode. When unit is changed to auto mode from other modes, it
will maintain its previous working status (If auto mode is turned on
from drying mode, unit will operate according to auto fan mode).
②
Protection function is same as that under each mode.
(2) Cooling mode
①
Operation condition and process for cooling mode
◆
When Tamb. ≥Tset+1
℃
, the system operates under cooling
mode. In this case, the compressor, the ODU fan motor and the
IDU fan motor operates at set speed.
◆
When Tamb. ≤Tset-1
℃
, the compressor and the ODU fan
motor stop, while the IDU fan motor operates at set speed.
◆
When Tset-1
℃
<Tamb. <Tset+1
℃
, the system will maintain its
previous operation status.
In cooling mode, the 4-way valve is de-energized (4-way valve is
not available for cooling only unit). Temperature setting range is
16~30
℃
.
②
Protection function
◆
Freeze protection
During operation, when controller detected that Ttube≤0
℃
for a
consecutive period of time, the system enters into freeze protec-
tion. In that case, the compressor and the ODU fan stop opera-
tion, while the IDU operates at set fan speed. If freeze protection
is released and the compressor has been out of operation for 3
mins, the unit will resume its previous operation status.
◆
Overcurrent protection ( this protection function is not available
for those models whose cooling capacity ≤12000Btu/h)
During operation process, if controller detected that system cur-
rent exceeds the limit value for 3s consecutively (overcurrent),
only the fan operates. About 3 mins later, if overcurrent is re-
leased, the system will resume original operation.
If overcurrent protection occurs for 6 times consecutively, and
resume operation time wont exceed 6min every time, overcurrent
protection information will be displayed. After turning off the unit,
display wont be displayed.
If turn on the unit again, the system will be restated up again.
Overcurrent protection information will be eliminated.
Please refer to maintenance part for display information and dis-
posal method for details.
◆
Locked protection to IDU fan motor
During operation of IDU fan motor, if controller detected that
the rotation speed of IDU fan motor less than 300/min or stop
rotation, the motor operates abnormally. In order to prevent
damage to motor, controller will protect automatically, the system
stops operation and blocked information of IDU fan motor will be
displayed. After turning off the unit, display wont be displayed.
If turn on the unit again, the system will be restated up again.
Blocked information of IDU fan motor will be eliminated. (For some
models, they can only be restated up after re-energized.)
Please refer to maintenance part for display information and
disposal method for details.
(3) Drying mode
①
Operation condition and process for drying mode
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