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Service Manual 47
Operation
Function of Outdoor Unit
Outdoor Unit
Two Comp algorithm
Operating Step
LEV Control
Out door Fan Control
• Compressor step varies considering condition such as room temp,outdoor temp, operating room
number,Temp gap between room temp and set temp and so on.
• LEV pulse is modulated to keep constant superheat or subcooling.
• Outdoor fan operates at High or Off to respond to the load condition.
R/Valve Control(Heating Model Only)
• Convert R/Valve to change cooling to heating, heating to cooling.
Defrost Function
• After 45 min heating operation, check the defrost condition and if outdoor pipe temp is below -
5°C(23°F) and released from deice operation in case outdoor pipe temp is over 12°C(53.6°F) or 9 min
cooing mode.
• To deice outdoor heat exchanger in low temp condtion, convert operating mode from heating to
Oil Return System
• In single(one) comp operation duration, another comp will operate for 30 seconds every 1 hours.
Comp Overload Protection
• To protect comp from being overload, protector will turn off the comp.
High Pressure Protction
• If cycle pressure is too high(around 36.7 kgf/cm
2
), it will turn off comp A
• Inverter Comp is first priority and then Constant Comp is turning on responding to load condtion.