Compressor Start-Up Protection - Daikin Quaternity FTXG09HVJU Service Manual

SiUS04-921
The four-way valve compensation function is engaged in four cases
 When starting the compressor for heating.
 When the operation mode is changed.
 When starting the compressor for defrosting.
 When starting the compressor after a power failure (auto-restart).
No power to the valve --> cooling.
Power to the valve --> heating.
Cooling
Heating
3.4

Compressor Start-up Protection

Details
The gradual buildup of the upper operation frequency is illustrated in the graph below.
Fig. : Compressor protection function graph.
Timers and frequencies for the compressor protection function
Function and Control
outdoor temperature < 16°C(60.8°F)
outdoor temperature 16°C(60.8°F) – 0.9 x outdoor temperature (°C) + 68
Frequency
(Hz)
FCG5
FCG4
FCG3
FCG2
FCG1
TCG1
FCG1 52
FCG2 52
FCG3 58
FCG4 80
FCG5 98
TCG1 450
TCG2 90
TCG3 90
TCG4 60
TCG5 60
Frequency [Hz]
52
52
TCG2 TCG3 TCG4
Control Specification
Time [sec]
60
Time
(sec)
TCG5
(R10093)
39