Fujitsu R407C

2. Oil return solenoid valves
Individual oil return
Central oil return control
Solenoid valve Application
Solenoid valve SV3
SV4
SV5
SV6
Compressor 1
Compressor 2
Compressor 3
Compressor 1/2/3
3. Individual oil return control
When a compressor operates continuously for 1 minute or longer and any of the following conditions is satisfied,
the solenoid valve corresponding to the compressor opens for 10 seconds to return the oil accumulated in the
oil separator to the compressor.
(1) The integrated operating time of the compressor has reached 15 minutes or longer.
(2) The compressor is stopped.
4. Central oil return control
When any of the following conditions is satisfied, the solenoid valve SV6 opens on and central oil return control
begins.
(1) One or more compressors are operating and the integrated time of "1 or more compressors operating" state
exceeds 15 minutes
(2) All the compressors are stopped.
3-8 OIL RETURN CONTROL
OIL
SEPARATOR
OIL
SEPARA
OIL
SEPARA
COMP.1
COMP.2
COMP.3
SV3
SV4
SV5
SV6
There are two oil return controls, one is the individual oil return control
and the other one is centralized oil return control. When any of the
solenoid valves opens, the oil return is performed.
TOR
TOR
control
03-09
1. Two kinds of oil return control