Functions
Outdoor Unit
Power relay control
• If power is on, it will operate to chage capacitor on controller and power relay will operate after about 2~5sec.
Stand by control at low temp.
•If outdoor temp. is below 0°C, preheater is operating for 1~5min.
•At the initial, It will be operated compressor after 1min. for preheating.
Active power filter control(PSC)
•The active power filter is designed to correct power factor(cos θ ) and to regulate DC link voltage.
•It will be operated PFC circuit when the compressor freq. is over 30Hz and wattage is over 450 watt.
Comp. Freq. control
•The final operating freq. of comp. is set the lowest freq. that limited outdoor temp., discharge pipe temp.,
Overheatng. Protection(Power module)
• When the temp. of power module increases to 85°C, controller decreases Freq. of Comp.
Freq. speed control(up/down speed)
• It will be changed the drive freq. of comp. according to temp. of indoor and outdoor.
V/F control
• It will be changed the drive voltage of comp. according to operating frequency.
Total current control (over current protection)
DC peak current control
4 way valve control
• It is only operated in the heating operation mode except defrosting operation.
Outdoor fan motor control
•High speed
-Although fan motor speed is middle, it will change high speed in case of below AC193V, over 45°C of outdoor temp., and over fc, fh of comp. Freq.
•Middle speed
-Nomal mode
•Low speed
-Although fan motor speed is middle, it will change Low speed in case of over AC 270V, over 21°C (Heating Mode) of outdoor temp. below 24°C (Cooling Mode) of outdoor temp.
Discharge pipe temp. control
Low ambient
Service Manual 31
