Outline of Control ESIE09-05
40 Function
6.2 Freeze Prevention
Freeze
Prevention by Off
Cycle (AHU)
When the temperature detected by liquid pipe temperature thermistor (R2T) of the AHU heat
exchanger drops too low, the unit enters freeze prevention operation in accordance with the
following conditions, and is also set in accordance with the conditions given below.
Conditions for starting freeze prevention: Temperature is –1°C or less for total of 40 min., or
temperature is –5°C or less for total of 10 min.
Conditions for stopping freeze prevention: Temperature is +7°C or more for 10 min.
continuously
Ex: Case where temperature is –5°C or less for total of 10 min.
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