Freeze Prevention - Daikin RXYQ96PYDN Service Manual

Freeze Prevention

7. Freeze Prevention
Freeze
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
Prevention by Off
following conditions, and is also set in accordance with the conditions given below.
Cycle (Indoor
When freeze prevention is activated, the electronic expansion valve is closed, the drain pump turns
Unit)
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.
294
44.6ºF
32ºF
23ºF
10 min.
OR
44.6ºF
32ºF
30.2ºF
t1 t2
44.6ºF
32ºF
1 min.
OR
44.6ºF
33.8ºF
t1 t2
Freeze prevention operation
Forced OFF by thermostat
Freeze prevention operation
Forced OFF by thermostat
t3 t4 t >40min.
10 min.
Freeze prevention operation
Forced OFF by thermostat
10 min.
Freeze prevention operation
Forced OFF by thermostat
t >15min.
t3 t4
SiUS34-801A_b
10 min.
(VG005)
10 min.
Indoor Unit