Fan Control; Moisture Protection Function 1 (Securing Of Differential Pressure And Blown Air Temperature) - Daikin FLKS25BVMB Service Manual

SiBE05-311
3.8

Fan Control

Outline Fan control is carried out according to the following priority.
1. Fan ON control for electric component cooling fan
2. Fan control when defrosting
3. Fan OFF delay when stopped
4. ON/OFF control when cooling operation
5. Tap control when drooping function is working
6. Fan control when forced operation
7. Fan control in indoor / outdoor silent operation
8. Fan control during heating operation
9. Fan control in the powerful mode
10. Fan control for pressure difference upkeep
Detail
Fan OFF Control when Stopped
3.9 Moisture Protection Function 1 (Securing of Differential
Pressure and Blown Air Temperature)
Outline
To secure the reliability of the compressor (for dryness of suction refrigerant and differential
pressure) which is the primary purpose of the compressor, the lower limit of the output
frequency is limited to two stages under the condition of outside air temperature. This time, in
addition to this purpose, this function is adopted also for prevention of cold draught by securing
the blown air temperature at the time of heating operation by low-temperature out side air.
Processing
1. At the first step
2. At the second step
Function and Control
Fan OFF delay for 60 seconds must be made when the compressor is stopped.
During operation of compressors.
Outdoor temperature ≤ DOA1CG
If and are under the simultaneous condition with AND, the lower limit of frequency in
this function is set at FCG7.
Compressors stop.
Outdoor temperature ≥ DOA2CG
If and are under the simultaneous condition with OR, the lower limit of frequency at the
first step control is cancelled.
During operation of compressors
Outdoor temperature ≤ DOA3CG
If and are under the simultaneous condition with AND, the lower limit of frequency in
this function is set at FCG8.
Compressors stop.
Outdoor temperature ≥ DOA4CG
If and are under the coordinate condition with OR, the lower limit of frequency at the
second step control is cancelled.
Control Specification
37