Oil Recovery Control - Fujitsu AB12 Service Manual

5-11 OIL RECOVERY CONTROL

When any the following conditions is satisfied, the indoor fan stops and " Oil recovery operation " starts.
(1) One or more compressor are operating.
(2) The integrated operating time in the " 1 or more compressors operating state " has exceeded 4-6 hours.
(3) Defrosting is not performed.
However the first oil recovery operation after the power is turned on is performed when the integrated operating
*
time in the " 1 or more compressors operating " state has exceeded 1 hour.
Compressor 1
Compressor 2
Compressor 3
Indoor Fan
Oil recovery start
A mins
*
Oil recovery end
1 min
When oil recovery error not generated
When oil recovery error generated
– 55 –
ON
OFF
ON
OFF
ON
OFF
ON
OFF
A= 4-6 mins
A= 7-9 mins