Daikin FTKB09AXVJU - Indoor Coil Freeze Prevention; High Pressure Protection

Algorithm & Control
27
09 class 12 class 18 class 24 class
A (minute) 20 - 25 20 - 25 25 25
B
(°C) 2 - 20 2 - 20 6 - 30 6 - 30
(°F) 35.6 – 68.0 35.6 – 68.0 42.8 – 86.0 42.8 – 86.0
C (Hz) 64 64 48 48
D (Hz) 64 64 42 42
E (seconds) 40 40 60 60
F (seconds) 60 60 60 60
G (seconds) 630 630 490 490
H (seconds) 40 50 60 90
J (seconds) 8 8 5 5
K (pulse) 400 400 450 450
L (pulse) 300 300 300 – 450 300 – 450
M (pulse) 200 350 200 200
2.20 Indoor Coil Freeze Prevention
Only available in cooling mode.
Whentheindoorcoiltemperature<2°C(35.6°F),thecompressorstartstodropthefrequency.
This protection will cut in when:
• Indoorcoiltemperature<0°C(32°F)formorethan180s.Compressorwillstop,outdoorfanstopafter
30s and indoor fan can only run at lowest fan speed.
The unit can only be restarted after 3 minutes.
Whentheindoorcoiltemperature>13°C(55.4°F),thecompressorfrequencywillberesetbasedonthe
outdoor ambient, room and set temperature.
2.21 High Pressure Protection
To prevent high pressure in the system.
Compressor operating frequency is adjusted based on upper limit of coil temperature.
Upper Limit Coil
Temperature
Compressor frequency
A
64°C / 147.2°F
B C
The compressor frequency is adjusted based on coil temperature:
• During cooling mode : outdoor coil temperature.
• During heating mode : indoor coil temperature.
Thisprotectionisactivatedwhenthecoiltemperature>64°C(147.2°F),thecompressorstopsandoutdoor
fan stops after 30s.The unit can only be restarted after 3 minutes.