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Service Manual
Function of Outdoor Unit
Outdoor Unit
Operating Step
LEV Control
Outdoor Fan Control
• Compressor step varies considering conditions such as room temperature, operating room number,
temperature gap between room temperature and set point temperature and so on.
• The linear expansion valve is 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)
• Reversing valves is used to change cooling to heating, heating to cooling.
Defrost Function
• After 45 minutes in heating mode, defrost mode will take effect if the outdoor pipe temp is below 5°C
(23°F). The defrost mode will end when the outdoor pipe temp is above 12°C (53.6°F) or after the unit
has been operated in cooling mode for 9 minutes.
• To de-ice the outdoor heat exchanger in low temperature conditions, the unit will defrost by changing
the operating mode from heating to cooling, while turning off both indoor and outdoor fans.
Oil Return System
• In single(one) compressor operation duration, another compressor will operate for 30 seconds every 1
hours.
compressor Overload Protection
• To protect compressor from being overloaded, the compressor overload protector will turn the
compressor off.
High Pressure Protction
• If the refrigerant cycle's pressure is too high, above 36.7 kgf/cm
2
(521.997psi), the high pressure
switch will turn the compressor off.
Operation