Daikin FTXD50JV1B [46/164] 4 way valve function compensation

General Functions SiBE04-101

38 Main Function

1.17 4-Way Valve Function Compensation

Outline When the initial start of compressors is required after power is on or at operation mode’s alteration

(Cooling/Dry ↔ Heating) that the a switch-over of a 4-way valve takes place, it secures the necessary

differential pressure by restricting the operation frequency in the lower limit in a certain period, and the

switch-over action is ensured.

Caution To avoid the temperature rise of the 4-way valve coil, the 4-way valve coil is energized in heating

operation.

Details of the

Control

1. If a 4-way valve is OFF when compressors stop, it will be ON at this time.

2. If a 4-way valve was ON when compressors operated in the last time, it will be ON at this time.

3. At the start of compressors.

4. At the initial start of compressors after power is reset.

In case 1. and 3. are under the simultaneous condition of AND (it indicates Heating) or 2. and 3 are under

the simultaneous satisfaction of AND (it indicates Cooling), or condition 4. is adapted, the processing

applies A seconds after compressors begin operating and to set B Hz for the lower limit of operation

frequency.

A (sec) B (Hz)

Cooling 50~71 Class 60 56

Heating

50 Class

60 56

60 Class 60 42

71 Class 60 32

SiBE04-101.book Page 38 Monday, October 15, 2001 3:08 PM