Daikin ARXN25MV1B, Руководство по обслуживанию

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Function & Control
20
2.15 Defrost Cycle
During defrost All models
Compressor ON
4-way valve OFF
EXV in operation room Fixed opening
Outdoor fan OFF
Indoor fan OFF
Condition for entering defrost
• Compressor minimum run time – 6 minutes OR
• Compressor accumulated run time of 45 minutes if Outdoor coil < 3°C.
Condition for terminating defrost
• OD coil > 12°C or
• Total defrost timer of 650 seconds.
2.16 Indoor Coil Freeze Prevention
Only available in cooling mode.
When the indoor coil temperature < 2°C, the compressor starts to drop the frequency.
This protection will cut in when:
• Indoor coil temperature < 0°C for more than 180s. Compressor will stop, OD 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, the compressor frequency will be reset based on the OD ambient,
room and set temperature.
2.17 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
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, the compressor stop and OD fan stop after
30s.The unit can only be restarted after 3 minutes.