3. ANTI-FREEZING CONTROL (Cooling mode)
The compressor frequency decreases on cooling mode when the indoor heat exchanger
temperature sensor detects the temperature lower than 37.4°F (3°C).
Then, the anti-freezing control is released when it becomes higher than 42.8°F (6°C).
(Fig 11 : Anti-freezing Protection Operation / Release Temperature)
4. COOLING PRESSURE OVER RISE PROTECTION
When the outdoor unit heat exchange sensor temperature rises to
158.9°F (70.5°C)
or greater,
the compressor is stopped and error display is indicated.
Indoor heat exchange
temperature
5. HIGH TEMPERATURE RELEASE CONTROL ( HEATING MODE )
On heating mode, the compressor frequency is controlled as following based on the
detection value of the indoor heat exchanger temperature sensor.
(Fig 12 : Heating Overload Protection Control)
01-21
145.4°F
(63°C)
129.2°F
(54°C)
122°F
(50°C)
Compressor is OFF
The compressor frequency is
decreased 10Hz every 60seconds.
Compressor OFF :
Release of protection
Compressor ON :
The compressor frequency is
increased 10Hz every 60seconds.
Hold
Indoor heat exchange
temperature
37.4°F
(3°C)
42.8°F
(6°C)
53.6°F
(12°C)
The compressor frequency is
decreased 10Hz every 120seconds.
Compressor OFF : Hold
Compressor ON : Release of protection
Hold
Release of protection
When the compressor frequency becomes lower than minimum frequency,
the compressor operates at minimum frequency.
If the indoor heat exchanger temperature sensor detects the temperature lower than
37.4°F (3°C) after 2minutes upon operating the compressor at minimum frequency,
the compressor stops.
