Outdoor Unit Low Noise Operation - Fujitsu AUXG18KVLA Service Manual

7-12. Outdoor unit low noise operation

The compressor frequency and outdoor unit fan speed are limited to reduce the operation noise by
external input.
Low noise mode
AOHG36KRTA
AOHG45KRTA
AOHG54KRTA
NOTES:
• During the defrost operation, the compressor operates by the speed for defrost operation.
• Even during the low noise operation, the operations of current overload, economy, and peak cut
are effective and the outdoor unit operates by lowest current of them.
Capacity priority mode
• Operation condition
The function setting is set to 1.
• Capacity check condition
– Shortage: Compressor frequency > limited compressor frequency for low noise mode
– Enough: Compressor frequency ≤ limited compressor frequency for low noise mode
• Operation
When detecting the shortage capacity or enough capacity condition continuous 30 minutes, the
mode is changed as follows:
– Automatic switching 1 (Level 1 setting)
– Automatic switching 2 (Level 2 setting)
7-12. Outdoor unit low noise operation
Low noise mode
Cooling/Dry
Level 1
Heating
Cooling/Dry
Level 2
Heating
Cooling/Dry
Level 1
Heating
Cooling/Dry
Level 2
Heating
Low noise mode 1
Shortage for 30 min
Low noise
mode 2
Enough for 30 min
Outdoor fan speed
rpm
830
830
740
740
Shortage for 30 min
Normal operation
Enough for 30 min
Shortage for 30 min
Low noise
mode 1
Enough for 30 min
- (04-33) -
Compressor
frequency
rps
44
36
60
40
Normal
operation
7. Various control