Si18-201
System control
Main Functions
137
3.19
Differential Pressure Control
Outline
This function sets an upper limit for the fan rotation speed according to the outside temperature
and outdoor heat exchanger temperature during cooling operation with low outside temperature.
By limiting the fan rotation, the function ensures sufficient differential pressure.
Details
In cooling operation (outside temperature DOA
≤
30ºC) or in heating mode oil recovery
operation, this function provides an upper-limit control of the fan rotation according to the
temperature zone of the high pressure equivalent saturation temperature, as shown below.
A change of 2 Hz is made when each zone fluctuates.
The mask time is 30 seconds at the time of heating mode oil recovery operation start, and the
reset zone is set for 30 seconds when the number of operating room units changes.
When 330 rpm operation remains for 10 continuous minutes during normal cooling operation,
the thermostat is turned off.
When 330 rpm operation remains for 10 continuous minutes during heating mode oil recovery
operation, the fans are turned off.
Drooping speed : 15rpm/30sec
Reset zone
No-change zone
Drooping zone
Increasing zone
Increasing speed
15rpm/30sec
(M1027)
DLTF4 : 40˚C
DLTF3 : 34˚C
DLTF2 : 32˚C
DLTF1 : 30˚C
Содержание BPMK928B42
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Страница 237: ...Method of Field Set Si18 201 224 Operating Test ...
Страница 262: ...Si18 201 Troubleshooting SkyAir Indoor Unit Service Diagnosis 249 ...
Страница 393: ...Wiring Diagrams Si18 201 380 Appendix FHYC35 50 60 71KVE9 3D005668C ...
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Страница 395: ...Wiring Diagrams Si18 201 382 Appendix FDYM60 03FAV1 FDYM60 03FAVAL C 3D019816D OPTION ...
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