General Functionality
SIE-86
30
Main Function
1.16
Four-Way Valve Function Compensation (H / J Type)
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 four-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.
Processing
1. If a four-way valve is OFF when compressors stop, it will be ON at this time.
2. If a four-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 Cooling) or 2. and 3 are under
the simultaneous satisfaction of AND (it indicates Heating), 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)
H type 25 / 35
45
66
J type
25 / 35
45
66
Si-86.book Page 30 Friday, June 23, 2000 10:26 AM
