Daikin VRV III, Руководство по обслуживанию, Страница: 309 / 567

Freeze Prevention SiUS34-801A_b
294 Indoor Unit
7. Freeze Prevention
Freeze
Prevention by Off
Cycle (Indoor
Unit)
When the temperature detected by liquid pipe temperature thermistor (R2T) of the indoor unit 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.
When freeze prevention is activated, the electronic expansion valve is closed, the drain pump turns
ON and the fan tap is fixed to L air flow. When the following conditions for stopping are satisfied, it
returns.
Conditions for starting freeze prevention: Temperature is 30.2°F or less for total of 40 min., or
temperature is 23°F or less for total of 10 min.
Conditions for stopping freeze prevention: Temperature is 44.6°F or more for 10 min. continuously.
[Conditions for starting when air flow direction is two-way or three-way]
Conditions for starting: Temperature is 33.8ºF or less for a total of 15 minutes or 32ºF or less for 1
minute continuously.
23ºF
32 ºF
44.6ºF
30.2ºF
t1 t2 t3 t4
32 ºF
44.6ºF
10 min.
(VG005)
OR
10 min.
10 min.
Freeze prevention operation
Forced OFF by thermostat
Freeze prevention operation
Forced OFF by thermostat
t > 40 min.
32 ºF
44.6ºF
10 min.
1 min.
Freeze prevention operation
Forced OFF by thermostat
33.8ºF
t1 t2 t3 t4
44.6ºF
10 min.
Freeze prevention operation
Forced OFF by thermostat
OR
t > 15 min.