Daikin FTXN35KEV1B Service Manual

SiBE041102_A Control Specification
Function and Control 25
3.3 Controls at Mode Changing / Start-up
3.3.1 Preheating Operation
Outline The inverter operation in open phase starts with the conditions of the preheating command from
the indoor unit, the outdoor temperature, and the discharge pipe temperature.
Detail Outdoor temperature
≥
7°C
→
Control A
Outdoor temperature < 7°C
→
Control B
Control A

ON condition
Discharge pipe temperature < 10°C

OFF condition
Discharge pipe temperature > 12°C
Radiation fin temperature
≥
90°C
Control B

ON condition
Discharge pipe temperature < 20°C

OFF condition
Discharge pipe temperature > 22°C
Radiation fin temperature
≥
90°C
3.3.2 Four Way Valve Switching
Outline In heating operation, current is conducted, and in cooling and defrosting, current is not
conducted. In order to eliminate the switching sound as the four way valve coil switches from
ON to OFF when the heating is stopped, the OFF delay switch of the four way valve is carried
out after the operation stopped.
Detail OFF delay switch of four way valve:
The four way valve coil is energized for 160 seconds after the operation is stopped.
3.3.3 Four Way Valve Operation Compensation
Outline At the beginning of the operation as the four way valve is switched, the pressure difference to
activate the four way valve is acquired 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 operation mode changes from heating to cooling
3. When starting compressor for defrosting
4. When starting compressor for heating after defrosting
5. When starting compressor for the first time after resetting with the power ON
6. When starting compressor after the fault of switching over cooling / heating
The lower limit of frequency keeps A Hz for B seconds with any conditions 1 through 6 above.
3.3.4 3-minute Standby
Turning on the compressor is prohibited for 3 minutes after turning it off.
(Except when defrosting.)
A (Hz) 62
B (seconds) 50

Daikin FTXN35KEV1B Specifications

General

Brand	Daikin
Model	FTXN35KEV1B
Category	Air Conditioner
Language	English