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Outline of Control (Indoor Unit)
SiUS28-902_B
32
Function
6.4
Freeze-up Prevention
Freeze-up
Prevention by Off
Cycle (Indoor
Unit)
When the temperature detected by liquid pipe temperature thermistor of the indoor unit heat
exchanger drops too low, the unit enters freeze-up prevention operation in accordance with the
following conditions, and is also set in accordance with the conditions given below.
Conditions for starting freeze-up prevention: Temperature is 30°F or less for total of 40 minutes,
or temperature is 23°F or less for a total of 10 minutes.
Conditions for stopping freeze-up prevention: Temperature is 45°F or more for 10 minutes.
continuously.
Ex: Case where temperature is 23°F or less for total of 10 minutes.
45˚F
32˚F
23˚F
10 min.
10 min.
Freeze-up prevention operation
Forced OFF by thermostat