Speed Range Of Start,Stop,And Operation; Target Low-Pressure And High-Pressure Control; Cooling Starting Process - Fujitsu Airstage V-II Service Manual

(2) Target low-pressure and high-pressure control

<Cooling>
In order to make the evaporation pressure of the indoor unit at the proper pressure on a variety of operations,
capacity of the compressor will be controlled by low-pressure sensor of the outdoor unit (Master unit).
<Heating>
In order to make the condensation pressure of the indoor unit at the proper pressure on a variety of operations,
capacity of the compressor will be controlled by high-pressure sensor of the outdoor unit (Master unit).
Target low-pressure and high pressure temperature depends on system capacity, capacity of compressor operation,
pipe length, and capacity shift switch settings.
2-2-3 Speed Range of Start, Stop, And Operation
(For DC Inverter Rotary Compressor)
On stop mode : 0 rps
On operating mode : 30 - 100 rps
Master and slave inverter compressors rotational speed are controlled the same
( In the case of multi outdoor unit )

(1) Cooling starting process

For cooling operation only, the upper limit speed at starting is made 50rps and is raised in
+10rps increments every 60 seconds.
The compressor operates at the upper limit speed if the target speed is higher than the upper limit speed.
The compressor operates at the target speed if the target speed is lower than the upper limit speed.
90rps
80rps
70rps
60rps
50rps
0
10rps
10rps
10rps
60sec
60sec
60sec
60 120 180
sec sec
60sec
240
Time
sec sec
02-03
Target speed