SYSTEM PRINCIPLE
When
the power is on, indoor unit , outdoor unit start to work. When the system is
running in cool mode, the compressor sucks low-temperature, low-pressure,
refrigerant gas from indoor evaporator and then discharges high-temperature,
high-pressure refrigerant gas into outdoor heat ex-changer With the help of
axial flow fan, the gas transfers its latent heat into outdoor air and becomes
high-pressure refrigerant liquid. The liquid is throttled by the capillary and
changes into low-temperature and low-pressure liquid and then flows into indoor
heat ex-changer With the help of centrifugal fan, the liquid evaporates into
low-temperature refrigerant gas and indoor air is cooled down. The refrigerant
gas is sucked into the compressor and the cycle introduced above goes on and
on, and the demanded low temperature environment is maintained. When the system operates in heat mode, 4-way
valve changes its way and the refrigerant flows in the reversible cycle as the
cool mode. The refrigerant discharges its latent heat in the indoor heat
exchange ex changer and sucks heat from outdoor heat ex changer and forms the
heat pump cycle. This cycle goes on and on, and the demanded high temperature
environment is maintained.
PCB FUNCTIONS
PCB functions: Fundamental functions:
- After electrified, no matter in any circumstances, the twice interval of starting should no less than 3mins, when the first electrified, there are no 3mins delay; once the compressor start up, the unit will not be turned off within 6mins, according to room temp changes.
- Over current protection: When detecting the system is running in anti-freezing protection, the compressor, outdoor fan motor will stop running, indoor fan motor will run at set fan speed. When anti-freezing eliminated and compressor had stopped 3mins, system renew the original running mode.
- DRY Mode: The conditions and processes of dehumidifying: DRY mode will act, indoor fan will run at low speed. Enter into DRY operation, the compressor and outdoor fan start running for 6 mins then stop running, after 4min, the compressor, outer fan will restart, the DRY operation will run as above, the indoor fan will keeps low fan speed running. ,compressor, outdoor fan motor will stop running, indoor fan motor will keep low fan speed mingling In this mode, the reversal valve will not power on, the setting temp. range :16degreeC – 30degreeC.
- Antifreeze Protection: When running in Antifreeze protection, the compressor, outer fan motor, stop running, indoor fan motor runs at low fan speed; when antifreeze is eliminated and compressor has stopped for 3min, the unit will run at the original status.
- HEAT Mode: Enter into HEAT mode, at the same time, reversing valve, compressor, outdoor fan start to run, but indoor fan will delay 3min at least to run. Compressor, outdoor fan stop running, the reversing valve will run, but indoor fan will blow wind after 60sec. at low fan speed.
- The conditions and processes of defrosting: When detecting there is frost on the condenser, system enter into defrosting state, at this time, compressor continue to run, the outer fan motor, 4-way valve, indoor fan motor stop running, the running indicator flash, when detecting the frost on the condenser eliminated.
- Anti-high temperature protection: When detected the evaporator tube temp. is too high, outdoor fan motor stop running; when tube temp. of evaporator resumed, outdoor fan motor will resume to run.
- Noise protection: When to turn off the unit by using "RUN/STOP" , the reversing valve will delayed 2mins to turn off; or mode shift will delay 2 minutes.
- Fan mode: In this mode, indoor fan can select Hi, Med, Low and Auto ( Med is default) to run, the compressor, outdoor fan motor, 4-way valve stop running.
- Auto mode: In this mode, system will accord the changes of ambient temp. to select the running mode (COOL, DRY, HEAT and FAN). The protection function as the mode of COOL, HEAT.
- Sleep function: When it is cooling and drying, after setting the sleep mode for 1hour, Tset will be increased 1¡æ; after 2hours, Tset will be increased 2¡æ, indoor motor runs at low fan speed. When it is heating, after set the sleep mode for 1hour, Tset will be declined 1degreeC; 2hours later, Tset will be declined 2 ,indoor fan will run at low fan speed. The setting temp. of Sleep function in Auto mode will not change.
- Stepping motor control of front panel: After powered on or unit turned off, firstly the guide louver board will be turned off, then the front panel will be turned off. After unit turned on, firstly the guide louver board will turn on, then the front panel will be turned on. At unit is turned on, the front panel is opened up, while the unit is turned off, the front panel is closed.
- SWING motor control: When it is powered on, the guide louver turn to position O with anticlockwise direction, turn off the air outlet vent; when the unit is turned on, if there is no setting swing function, the guide louver will turn to the level position L with clockwise direction air outlet, if turning on the unit to set the swing function, the guide louver will swing from U to D.
- Buzzer: When PCB is power on or receives the signal from the wireless remote control, the buzzer will send out the sound once.
- Indicator light: RED: the running indicator, when defrosting it will flash. YELLOW: HEAT indicator. GREEN: COOL, DRY indicator.
- Auto fan speed control: In this mode, the indoor fan motor will accord to the changes of ambient temp. automatically to select Hi, Med, Low fan speed each fan speed shift time interval is 30sec.
- Memory function: When the controller break off and power on again, the memory is the state before breaking off, then the compressor will delay 3mins. When the timer had been setup and break off, if the time of timer had arrived, it break off and power on again, it will carry out follow the state before electricity break; if the time had not arrived, it break off, and power on, it will renew the memory.
