Controls At Mode Changing / Start-Up - Daikin FTXS09HVJU Service Manual

Control Specification (15/18/24 Class)
4.3

Controls at Mode Changing / Start-up

4.3.1 Preheating Operation
Outline Operate the inverter in the open phase operation with the conditions including the preheating
command from the indoor, the outdoor air temperature and discharge pipe temperature.
Detail
Preheating ON Condition
 When outdoor air temperature and discharge pipe temperature are below 51ºF, inverter in open
OFF Condition
 When outdoor air temperature or discharge pipe temperature is higher than 54ºF, inverter in
4.3.2 Four-Way Valve Switching
Outline During the heating operation the valve must be energized, and during cooling and defrosting,
current must not be energized. In order to eliminate the switching sound (as the four-way valve coil
switches from ON to OFF) when the heating operation is stopped, the delay switch of the four-way
valve must be carried out after the operation has stopped.
The OFF delay of four-way valve
Detail
Energize the coil for 150 seconds after unit operation is stopped.
4.3.3 Four-Way Valve Operation Compensation
At the beginning of the operation as the four-way valve is switched, acquire the differential pressure
Outline
required for activating the four-way valve by having output frequency, which is more than a certain
fixed frequency, for a certain fixed time.
Detail Starting Conditions
1. When starting compressor for heating.
2. When the operating mode changes from the previous time.
3. When starting compressor for starting defrosting or resetting.
4. When starting compressor for the first time after the reset with the power is ON.
4.3.4 3-Minute Standby
Prohibit to turn ON the compressor for 3 minutes after turning it off.
(except when defrosting)
4.3.5 Compressor Protection Function
When turning the compressor from OFF to ON, the upper limit of frequency must be set as follows.
(The function must not be used when defrosting.)
52
phase operation starts.
open phase operation stops.
Set the lower limit frequency to 55 (model by model) Hz for 70 seconds with any conditions 1
through 4 above.
FCG 1 55
FCG 2 70
FCG 3 85
TCG1 120
TCG2 200
TCG3 470
(Hz)
SiUS04-904
Time (Sec)
(R10540)
Function and Control