Fujitsu AIRSTAGE V-II, Service Manual

Page: 27 / 230

02-04
Normal control
End conditions
Normal control
Constant speed ON
30rps fixed
70rps fixed
70rps fixed 70rps fixed
(3) Limits the upper limit speed of the INV compressor according to the present high-pressure value.
(2) Heating starting process
At the start of heating, the compressor is started by the following process. All compressors start-up
to change the 4 way valve. Capacity control returns to normal control after the end of the starting process.
(target high-pressure control)
2 compressors outdoor unit (12, 14, 16HP) 1 compressor outdoor unit (8, 10HP)
Starting process Starting process Starting process Starting process
Starting process
Starting process
7 minutes elapsed from start of process
or
1 minute elapsed from start of process and high-pressure of
all outdoor units 2.50MPa
Compression ratio of any outdoor unit 8
30 minutes elapsed from start of process
or
high-pressure of all outdoor units 2.63MPa
or
discharge SH of all operating compressors 12
[ a ] = 1.25 Low pressure value 2.125
High Pressure
3.80MPa
3.30MPa
(Maximum) 3.00MPa
Maximum speed = 80rps
Maximum speed = 90rps
Maximum speed = 95rps
Maximum speed = 100rps
[ a ]
< Starting process >
Inverter compressor of all outdoor unit is started at 40rps and normal control immediately begins.
(target high-pressure control)
*However, when the following condition (A) or (B) are satisfied, starting process is not performed.
< Conditions under which starting process is not performed >
(A) When outside air temperature 20°C
(B) When the starting process at heating before stopped at the start of heating
(including thermostat OFF stop) within 30 minutes after heating stopped.
< Operation >