Daikin FTXS09HVJU - Control Specification (09;12 Class)

SiUS04-904 Control Specification (09/12 Class)
Function and Control 37
Detail How to Determine Frequency
The compressor’s frequency is determined by taking the following steps:
1. Determine command frequency
 Command frequency is determined in the following order of priority.
1.1 Limiting defrost control time
1.2 Forced cooling
1.3 Indoor frequency command
2. Determine upper limit frequency
 Set a minimum value as an upper limit frequency among the frequency upper limits of the
following functions:
Compressor protection, input current, discharge pipe temperature, heating peak-cut, freeze-up
protection, defrost.
3. Determine lower limit frequency
 Set a maximum value as an lower limit frequency among the frequency lower limits of the
following functions:
Four-way valve operation compensation, draft prevention, pressure difference stabilization .
4. Determine prohibited frequency
 There is a certain prohibited frequency such as a power supply frequency.