Fujitsu ASU18RLF Service Manual

4. HIGH TEMPERATURE RELEASE CONTROL ( Heating mode )
On heating mode, the compressor frequency is controlled as following based on the
detection value of the discharge pressure sensor.
( Fig. 23 : Heating overload protection control )
6. COMPRESSOR TEMPERATURE PROTECTION
Compressor temperature sensor is monitoring the compressor Temperature
When the compressor temperature sensor detects higher than Temperature , the compressor is stopped.
5. HIGH PRESSURE PROTECTION
226°F
(108°C)
176°F
(80°C)
AOU36RLXFZH
AOU45RLXFZ
Temperature
Temperature
Operation value [ psi (MPa) ] Release value [ psi (MPa) ]
Release value [ psi (MPa) ]
Operation value [ psi (MPa) ]Compressor frequency [ rps ]
rps < 20
Compressor frequency [ rps ]
( Table 26 : Cooling operation )
Hp > 500.38 psi (3.45 MPa)
During the compressor operation, when detect the condition of the following table value,
the protection function will be worked.
The operation condition varies according to the compressor speed.
The protection function is, the compressor speed is descreased 7 rps every 60 seconds.
Hp : detected discharge pressure sensor value
rps : detected compressor frequency
( Table 27 : Heating operation )
( Table 28 : Operation value )
When 3 minutes has passed from the compressor stop and the compressor temperature sensor detects
lower than Temperature , protection is released and the compressor will restart.
Outdoor heat exchange
tempreture
Dsicharge pressure [ psi (MPa) ]
8.6°F(-13°C) < Tn < 12.2°F(-11°C)
=
5°F(-15°C) < Tn < 8.6°F(-13°C)
=
-13°F(-25°C) < Tn < 5°F(-15°C)
=
-20.2°F(-29°C) < Tn < -13°F(-25°C)
=
478.62 psi
(3.30 MPa)
449.62 psi
(3.10 MPa)
406.11 psi
(2.80 MPa)
464.12 psi
(3.20 MPa)
478.62 psi
(3.00 MPa)
391.60 psi
(2.70 MPa)
435.11 psi
(3.00 MPa)
406.11 psi
(2.80 MPa)
377.10 psi
(2.60 MPa)
377.10 psi
(2.60 MPa)
362.59 psi
(2.50 MPa)
333.59 psi
(2.30 MPa)
333.59 psi
(2.30 MPa)
319.08 psi
(2.20 MPa)
290.08 psi
(2.00 MPa)
AB
C
discharge pressure rises
A psi ( A MPa )
B psi ( B MPa )
C psi ( C MPa )
Stable range
Release
The compressor frequency is
decreased 15rps every 120 seconds.
The compressor frequency is
decreased 2rps every 120 seconds.
Release
Tn < -20.2°F(-29°C)
=
Hp > 500.38 psi (3.45 MPa)
=
Hp > 507.63 psi (3.50 MPa)
=
Hp > 478.62 psi (3.30 MPa)
=
=
20 < rps < 90
=
90 < rps < 100
=
rps < 20
=
20 < rps < 90
=
90 < rps < 100
=
100 < rps
Hp > 551.14 psi (3.80 MPa)
=
Hp > 478.62 psi (3.30 MPa)
=
Hp < 471.37 psi (3.25 MPa)
=
Hp < 522.14 psi (3.60 MPa)
=
Hp < 449.62 psi (3.10 MPa)
=
Hp > 449.62 psi (3.10 MPa)
=
Hp < 471.37 psi (3.25 MPa)
=
Hp < 478.62 psi (3.30 MPa)
=
Hp < 449.62 psi (3.10 MPa)
=
Hp < 420.61 psi (2.90 MPa)
=
01-33

Fujitsu ASU18RLF Specifications

General

Brand	Fujitsu
Model	ASU18RLF
Category	Air Conditioner
Language	English