8. Control Outline
8.1 Cautions regard with DDC's programing
(1) Operation Start
- Capacity control signal(analogue input voltage) should be output after the AHU's fan operating.
Then, recommend to keep more than 50%(Heating; 40%) Capacity control signal during 5mins.
- To protect the compressor, for 5 mins after operation start the compressor will continue to operate even if
receives "Zero" Capacity control signal.
(2) Freeze prevention control (Low temperature release)
- When the compressor(s) stopped by Freeze prevention control, it will re-start after maximum 20 mins
depends on DX-COIL condition.
(3) Recovery control
- Both refrigerant recovery and oil (lubricant) recovery control during cooling and heating operation.
When RSW503,504 is set as [3], when recovery control starts output signal will be from *DO5/DO5,*DO6/DO6.
Please check outdoor units' Service Manual for more detail.
(4) Defrost control (Full Defrost)
-
Defrost control is designed to performed according to the amount of frost on the outdoor unit's time.
heat exchanger or the accumulation of operation
When defrost control starts, output signal will come from *DO4/DO4.
Please check outdoor units' Service Manual for more detail.
(5) Compressor restart prevention timer
- If the compressor(s) is stopped by Capacity control or protection function(except Freeze prevention control),
normally the compressor will continue to stop for 2 mins 30 secs, even if receives Capacity control signal.
P41
Summary of Contents for RBM-A101UPVA-E
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Page 45: ...9 Cable specifications P43 ...
Page 46: ...10 Modbus setting method P44 ...
Page 50: ...12 Dx coil Controller Dx valve kit Dimensions P48 ...
Page 51: ...12 Dx coil Controller Dx valve kit Dimensions P49 ...
Page 52: ...13 Wiring Diagram P50 ...
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Page 58: ...VRF Dx coil interface Design Guideline May 2022 Third Edition DG003 03 ...