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
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