Daikin RK35GV1B [46/184] Controls at mode changing start up

Daikin FTK20GV1B [46/184] Controls at mode changing start up

Si04-807 Control Specification

Function and Control 35

3.3 Controls at Mode Changing / Start-up

3.3.1 Preheating Operation

Outline Operate the inverter in the open phase operation with the conditions including the outdoor air

temperature, discharge pipe temperature, and fin temperature.

Detail Outside temperature

≥

7°C

→

Control A (preheating for normal state)

Outside temperature < 7°C

→

Control B (preheating of increased capacity)

Control A



ON condition

Discharge pipe temperature < 10°C

Fin temperature < 85°C



OFF condition

Discharge pipe temperature > 12°C

Fin temperature

≥

90°C

Control B



ON condition

Discharge pipe temperature < 20°C

Fin temperature < 85°C



OFF condition

Discharge pipe temperature > 22°C

Fin temperature

≥

90°C

Note: The power consumption of compressor during preheat operation is 35 W.

3.3.2 Four Way Valve Switching

Outline Heat Pump Only

During the heating operation current must be conducted and during cooling and defrosting

current must not be 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 delay switch of the four way

valve must be carried out after the operation stopped.

Detail The OFF delay of four way valve

Energize the coil for 160 sec after unit operation is stopped.

3.3.3 Four Way Valve Operation Compensation

Outline Heat Pump Only

At the beginning of the operation as the four way valve is switched, acquire the differential

pressure required for activating the four way valve by having output the operating 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 to cooling from heating.

3. When starting compressor for rushing defrosting or resetting.

4. When starting compressor for the first time after the reset with the power is ON.

5. When starting compressor for heating next to the suspension of defrosting.

6. When starting compressor next to the fault of switching over cooling / heating.

Set the lower limit frequency (cooling : 62Hz, heating : 62Hz) for 50 seconds with any conditions

1 through 6 above.

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