27
Technical Information
Service Manual
c.For heating and cooling unit, when 22°C<Tindoor ambient<26°C (for cooling only unit, 22°C<Tindoor ambient<26°C), it will keep the
original running mode. If the unit is energized for the first time, it will run in fan mode.
②
Protection
a. In cooling operation, protection is the same as that under the cooling mode;
b. In heating operation, protection is the same as that under the heating mode;
c. When ambient temperature changes, operation mode will be converted preferentially. Once started, the compressor willremain
unchanged for at least 6 minutes.
(7)Common Protection Functions and Fault Display under COOL, HEAT, DRY and AUTO Modes
①
Overload protection
T
tube
: measured temperature of outdoor heat exchanger under cooling mode; and measured temperature of indoor heat exchanger under
heating mode.
1) Cooling overload
a.If T tube≤52°C, the unit will return to its original operation state.
b.If T tube≥55°C, frequency rise is not allowed.
c.If T tube≥58°C, the compressor will run at reduced frequency.
d.If T tube≥62°C, the compressor will stop and the indoor fan will run at preset speed.
2) Heating overload
a.If T tube≤50°C, the unit will return to its original operation state.
b.If T tube≥53°C, frequency rise is not allowed.
c.If T tube≥56°C, the compressor will run at reduced frequency.
d.If T tube≥60°C, the compressor will stop and the indoor fan will blow residue heat and then stop.
②
Exhaust temperature protection of compressor
If exhaust temperature≥98°C, frequency is not allowed to rise.
If exhaust temperature≥103°C, the compressor will run at reduced frequency.
If exhaust temperature≥110°C, the compressor will stop.
If exhaust temperature≤90°C and the compressor has stayed at stop for at least 3 minutes, the compressor will resume its operation.
③
Communication fault
If the unit fails to receive correct signals for durative 3 minutes, communication fault can be justified and the whole system will stop.
④
Module protection
Under module protection mode, the compressor will stop. When the compressor remains at stop for at least 3 minutes, the compressor will
resume its operation. If module protection occurs six times in succession, the compressor will not be started again.
⑤
Overload protection
If temperature sensed by the overload sensor is over 115 , the compressor will stop and the outdoor fan will stop with a time lag of 30
seconds. If temperature is below 95 , the overload protection will be relieved.
⑥
DC bus voltage protection
If voltage on the DC bus is below 150V or over 420V, the compressor will stop and the outdoor fan will stop with a time lag of 30 seconds.
When voltage on the DC bus returns to its normal value and the compressor has stayed at stop for at least 3 minutes, the compressor will
resume its operation.
⑦
Faults of temperature sensors
Designation of sensors
Faults
Indoor ambient temperature
The sensor is detected to be open-circuited or short-circuited for successive 5 seconds
Indoor tube temperature
The sensor is detected to be open-circuited or short-circuited for successive 5 seconds
Outdoor ambient temperature
The sensor is detected to be open-circuited or short-circuited for successive 30 seconds
Outdoor tube temperature
The sensor is detected to be open-circuited or short-circuited for successive 30 seconds, and no
detection is performed within 10 minutes after defrost begins.
Exhaust
After the compressor has operated for 3 minutes, the sensor is detected to be open-circuited or
short-circuited for successive 30 seconds.
Overload
After the compressor has operated for 3 minutes, the sensor is detected to be open-circuited or
short-circuited for successive 30 seconds.
3. Other Controls
(1) ON/OFF
Press the remote button ON/OFF: the on-off state will be changed once each time you press the button.
(2) Mode Selection:
Press the remote button MODE, then select and show in the following ways: AUTO, COOL, DRY, FAN, HEAT, AUTO.
(3) Temperature Setting Option Button
Each time you press the remote button TEMP+ or TEMP-, the setting temperature will be up or down by 1°C. Regulating Range: 16~30°C,
the button is useless under the AUTO mode.
(4) Time Switch
You should start and stop the machine according to the setting time by remote control.
(5) SLEEP State Control
