33
Technical Information
Service Manual
system will increase set temperature automatically within 3°C
and then operate at increased temperature.
◆
If start up sleep function under heating mode, the system
will decrease set temperature automatically within 3°C and then
operate at decreased temperature.
(3) Turbo function
Turbo function can be set under cooling and heating modes
(Turbo function is not available in auto, drying and fan mode).
During operation of turbo function, the IDU fan motor operates at
the highest fan speed.
(4) X-FAN function
X-FAN function can be set under cooling and drying modes
(Turbo function is not available in auto, heating and fan mode).
During operation of X-FAN function, the IDU fan motor will stop
operation after operating for 10 mins at lowest fan speed when
turning off the unit and then the system stops operation.
(5) Auxiliary heating function
When auxiliary heating function is set in heating mode: IDU fan
motor operates and auxiliary electric heater operates; when
ambient temperature has reached a certain degree, the auxiliary
electric heater stops operation.
(6) Timer function
The controller has timer function. The precision of timer is 0.5
hour. 24 hours circulated timer can’t be set.
Timer ON: Timer ON can be set at unit OFF. If selected ON time
is reached, the unit will start to operate according to previous
setting status. Timer setting range is 0.5 ~ 24hr in 30-minute
increments.
Timer OFF: Timer OFF can be set at unit ON. If selected OFF
time is reached, the unit will stop. Timer setting range is 0.5 ~
24hr in 30-minute increments.
(7) Memory function
①
Power failure when the unit is ON
◆
Memory content: ON status, mode, up&down swing, light, set
temperature, set fan speed, timer.
◆
Timer can be memorized. Time of timer is calculated again
from energization.
②
Power failure when the unit is OFF
◆
Memory content: OFF status, mode, up&down swing, light,
set temperature, set fan speed, timer.
◆
Timer can be memorized. Time of timer is calculated again
from energization.
4. Special function
Health function (for the model with health function)
①
If there is health button on the remote controller, the unit
defaults health function ON when turning on the unit; press
health button on the remote controller or turning off the unit to
stop health function.
①
If there is not health button on the remote controller, the unit
defaults health function ON when turning on the unit and turning
off the unit to stop health function.
5. Protection function (more details please refer to
maintenance section)
(1) Freeze protection (applicable for cooling, drying and
auto mode)
During operation, when controller detected that Ttube ≤
－
2°C, the system enters into freeze protection. In that case, the
compressor and the ODU fan motor stop operation, while the
IDU fan motor and swing motor operates at previous status. If
Ttube ≥ 10°C and the compressor has been out of operation for
6 mins, the unit will resume its previous operation status.
Compressor
r
Indoor fan motor
6 min
Set fan speed
(2) Overcurrent protection (applicable for cooling, heating,
drying and auto mode)
During operation process, if controller detected that system
current exceeds the limit value for 3s consecutively (overcurrent),
the system stops operation. About 3 mins later, if overcurrent
is released, the system will resume original operation. If
overcurrent protection occurs for 6 times consecutively, and
resume operation time won’t exceed 6 mins every time, E5 will
be displayed on indoor unit. After turning off the unit and then
turn it on, overcurrent malfunction will be eliminated.
(3) High temperature protection of discharge pipe (for
the unit below 24000Btu/h, the software of this function
is reserved while hardware is shielded) (applicable for
cooling, heating, drying and auto mode)
When the system just starts and Tdischarge > 130 °C, the
system will stop operation after internal temperature of system
decreases. When the system has stopped for 3 mins and
Tdischarge < 90°C, the system will resume operation. If this
protection occurs twice consecutively, the system can not
resume operation and E4 will be displayed. After turning off
the unit and then turn it on, overcurrent malfunction will be
eliminated.
(4) Noise silencing protection (applicable for heating and
auto mode)
When turning off the unit or during mode switchover, the 4-way
valve is closed. In order to decrease noise, the 4-way valve will
6. Function and Control
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