Daikin FTXV25AV1B Service Manual page 38

Function and Control
fan motor blows residual heat for a while at set speed to prevent high temperature inside the unit.
◆ When Tset+3.5℃＜ Tamb. ＜ Tset+5℃ , the unit will maintain its previous operation status.
◆ When the unit stops due to malfunction or protection, the compressor, IDU fan motor and ODU fan motor stop operation.
◆ In heating process, when Tamb. is quite different from Tset, the compressor will run in relatively high frequency for quick heating;
when Tamb. is near Tset, the compressor frequency will decrease automatically for high coziness and efficiency.
In this mode, the 4-way valve is energized. Temperature setting range is 16 ～ 30℃ .
② The indoor unit displays operation icon, heating icon and set temperature.
③ Defrost conditions and process
In order to ensure heating effect, the unit will defrost automatically according to the frost status of outdoor unit. heating indicator on in-
door unit will ON 10s and OFF 0.5s successively during defrosting.
④ Protection functions (See function protection of this section)
1.2.2.6 Compressor control function
① The controller controls the operation frequency of compressor according to the relationship between ambient temperature and set
temperature and the changing speed of ambient temperature.
② When turning on the unit in cooling, heating or dry mode, the compressor starts after the ODU fan motor has operated for 5
seconds.
③ The compressor stops immediately when turning off the unit, switching to fan modes and unit stops for protection.
④ In each mode: once started, the compressor won't stop within 7 mins (note: including stop operation when reaching the temperature
point; not including malfunction protection, turning off the unit by remote controller or switching modes in which stopping operation of
compressor is needed).
⑤ In each mode: once stopped, the compressor won't start again within 3 mins; if the unit is with memory function, the compressor can
be restarted without delay when turning off the unit and then energizing again.
1.2.2.7 4-way valve control function
① The 4-way valve is de-energized in cooling, dry and fan mode;
② The 4-way valve is energized in heating mode;
③ When turning off the unit in heating mode or switching to other mode from heating mode, the compressor stops and the 4-way valve
is de-energized after a while;
④ When the unit stops for protection, the 4-way valve is de-energized after a while;
⑤ When starting defrosting, the compressor stops and the 4-way valve is de-energized after a while;
⑥ When existing defrosting, the compressor stops and the 4-way valve is energized after a while;
1.2.3.Other control functions
1.2.3.1 Timer function
General timer: the timer precision is 30min and set unit ON/OFF after a desired hour.
◆ Timer ON: timer ON can be set at unit OFF. If selected ON time is reached, the unit will start to run according to previous setting
status. Time setting range is 0.5~24hr in 30-minute increments.
◆ Timer OFF: timer OFF can be set at unit ON. If selected OFF time is reached, the unit will stop. Time setting range is 0.5~24hr in
30-minute increments.
30
T
preset+5 C
T
preset+3.5 C
T .
amb
7 min.
Compressor
Outdoor unit
Intdoor unit
Set fan speed
min.
Reversing
valve
Stop heating
Original operating status
Start heating
3 min. 7 min.
min. Set fan speed
SiK011003
Function and Control