Fujitsu ARC90LHTA User Manual

7 . CURRENT RELEASE CONTROL
The compressor speed is controlled so that the outdoor unit input current does not exceeds
the current limit value that was set up with the outdoor temperature and outdoor fan speed.
The compressor speed returns to the designated speed of the indoor unit at the time
when the speed becomes lower than the release value.
01-21
When Indoor unit
heat-exchanger
temperature rises
(Fig 19 : High temperature release control by indoor unit)
53°C
50°C
Refer to Table 11
(Table 11: Compressor Operation)
B zone
AO*A72LALT
73 rps~ 70 rps
43~70 rps Speed down every 2 minutes
34~40 rps 32 rps for 2 minutes
28~32 rps Stop
6. HEATING OVERLOAD PROTECTION
In Heating mode, the compressor speed is controlled as following based on the
detection value of the indoor heat-exchanger temperature sensor and pressure sensor.
6-1. High Temperature Release Control <Indoor unit control>
B zone
Azone
Normal Heating Control
82 rps~ 79 rps
45~79 rps Speed down every 2 minutes
34~42 rps 32 rps for 2 minutes
28~32 rps Stop
B zone
AO*A90LALT
A zone
When Indoor unit
heat-exchanger
temperature drops
4.10MPaG
3.50MPaG
3.00MPaG
Release of protection
*Hold
Compressor stop
-7 rps every 1 minute
Pressure
(Fig 20 : High pressure release control)
6-2. High Pressure Release Control <Outdoor unit control>
(a). When the high pressure value becomes more than 3.50MPaG, the compressor speed
-7 rps every 1 minute until it becomes 3.50MPaG or less.
(b). When the high pressure value becomes 3.00MPaG or less, the protection is released.
*During protection : Compressor speed is holded, or when a lower speed is directed, it accedes it.
During release of protection : Compressor operates according to the direction speed.
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Fujitsu ARC90LHTA Specifications

General

Brand	Fujitsu
Model	ARC90LHTA
Category	Air Conditioner
Language	English