Fujitsu AOU30RLXEH, Service Instruction

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5. LOW PRESSURE PROTECTION CONTROL (For Cooling mode)
<After the compressor start-up and 10 minutes has passed>
<After the compressor start-up and 1 minute has passed>
(a).The detected value of pressure sensor is 17.4 psi(0.02MPaG) or less, continues for 5 minutes,
the compressor is stopped.
(b). When 7 minutes has passed and low pressure sensor detects value is more than 21.8 psi(0.05MPaG)
after the protection stop by (a), the compressor restarts.
(c).When the protection (a) operates 5 times within 2 hours after the restart by (b), the error is displayed
and the compressor stops. [Permanent stop]
??? psi (0.78MPaG)
??? psi (0.68MPaG)
Release of protection
-8 rps every 1 minute
Pressure
( Fig. 20 : Anti freezing protection )
(a).When the low pressure value becomes ??? psi(0.68MPaG) or less continues for 1 minute,
the compressor speed -8 rps.
(b). When the low pressure value becomes ??? psi(0.68MPaG) or less after the protection (a), the compressor
continues speed -8 rps every 1 minute until the detected value becomes more than ??? psi (0.68MPaG).
(c). When the low pressure value becomes more than 0.78MPaG, this protection is released.
21.8 psi(0.05MPaG)
17.4 psi(0.02MPaG)
Release of protection
Hold
Compressor stop
Pressure
( Fig. 19 : Low pressure protection 1 )
Hold
5-1. Low Pressure Protection 1
5-2. Low Pressure Protection 2
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