Fujitsu ASU24RLF Service Instruction

01-30
4. COOLING PRESSURE OVER RISE PROTECTION
When the outdoor unit heat exchange sensor temperature rises to 158.9 6°F(70.5 3°C) or greater,
the compressor is stopped and error display is indicated.
Indoor heat exchange
temperature
5. HIGH TEMPERATURE RELEASE CONTROL ( HEATING MODE )
On heating mode, the compressor frequency is controlled as following based on the
detection value of the indoor heat exchanger temperature sensor.
(Fig. 18 : Heating Overload Protection Control)
145.4°F(63°C)
Compressor is OFF
The compressor frequency is
decreased 10rps every 20 seconds.
7. COMPRESSOR TEMPERATURE PROTECTION
Compressor temperature sensor is monitoring the compressor temperature.
When the compressor temperature sensor detects higher than Temperature ,
the compressor is stopped.
6. HIGH PRESSURE PROTECTION
When the pressure switch becomes OFF (Open : higher than 609.2 psi / 4.2 MPa),
the compressor is stopped.
It is released when the pressure switch becomes ON (Close : lower than 464.1 psi / 3.2 MPa)
after 3 minutes of compressor stop.
When the pressure switch is opened for 10 seconds from power on, all of outdoor unit operation is stopped.
The outdoor unit will start up if the pressure switch is returned to ON after 10 seconds has passed.
When 10 minutes (Cooling) or 3 minutes (Heating) has passed from the compressor stop and
pressure switch becomes ON, protection is released and the compressor will restart.
(1).
(2).
230°F
(110°C)
257°F
(125°C)
176°F
(80°C)
+
-
AOU18RLXFZ
AOU24RLXFZ
AOU36RLXFZ
Temperature
Temperature
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.
132.8°F(56°C)
129.2°F(54°C)
+
-
A°F(A°C)
B°F(B°C)
Outdoor heat exchange
tempreture
15.8°F(-9°C)
Stable range
Release
=
<
Th
12.2°F(-11°C)
=
<
Th
<15.8°F(-9°C)
8.6°F(-13°C)
=
<
Th
<12.2°F(-11°C)
5.0°F(-15°C)
=
<
Th
<8.6°F(-13°C)
Th
<5.0°F(-15°C)
In one operation of
the indoor unit
: Qu air than
All indoor unit
opeate,
: Qu air
125.6°F
(52°C)
125.6°F
(52°C)
125.6°F
(52°C)
122.0°F
(50°C)
118.4°F
(48°C)
122.0°F
(50°C)
122.0°F
(50°C)
118.4°F
(48°C)
114.8°F
(46°C)
111.2°F
(44°C)
118.4°F
(48°C)
118.4°F
(48°C)
118.4°F
(48°C)
118.4°F
(48°C)
118.4°F
(48°C)
114.8°F
(46°C)
114.8°F
(46°C)
114.8°F
(46°C)
114.8°F
(46°C)
114.8°F
(46°C)
A°F
(A°C)
A°F
(A°C)
B°F
(B°C)
B°F
(B°C)
The compressor frequency is
decreased 6rps every 60 seconds.
The compressor frequency is
decreased 2rps every 60 seconds.
Release

Fujitsu ASU24RLF Specifications

General

Brand	Fujitsu
Model	ASU24RLF
Category	Air Conditioner
Language	English