Fujitsu AUXG18KVLA, Service Manual

Page: 182 / 222

8-4. Low pressure protection control (cooling mode)
• After the compressor start-up and 10 minutes has passed
When the pressure sensor detected value is 0.68MPaG or less continues for 1minute, the com-
pressor frequency -8rps.
• After the frequency of the compressor -8rps and 1 minute has passed
When the pressure sensor detected value is 0.68MPaG or less, continues for 1 minute, the com-
pressor continues frequency -8rps every 1 minute until the detected value becomes more than
0.68MPaG.
When the detected value becomes more than 0.78MPaG, this protection is released.
• After the compressor start-up and 1 minute has passed
The detected value of pressure sensor is 0.02MPaG or less, continues for 5 minutes, the com-
pressor is stopped.
0.78MPaG
0.68MPaG
0.02MPaG
Release of protection
Hold
Compressor stop
-8rps every 1 minute
(When continues for 5 minutes)
8-4. Low pressure protection control (cooling mode)
- (04-36) -
8. Various protections
CONTROL AND FUNCTIONS CONTROL AND FUNCTIONS