Daikin R407C PLUS, Service Manual

Page: 93 / 267

Outline of Control (Outdoor Unit) < Symbols using in this manual > Si33-105
82 Function R407C PLUS Series Heat Recovery System
3.5.7 Oil Equalization Operation
Conducts oil equalization operation at certain time intervals to prevent insufficient oil supply due
to uneven oil distribution when two or three compressors are connected in parallel.
[For 16~20HP model units]
!
The following oil equalization operation is conducted after two STD compressors operates
for 2 continuous hours.
!
Oil equalization operation --- Upper-limit frequency is controlled to the following value.
"
The oil equalization operation is not activated during soft start, oil return operation and
defrosting operation (including defrosting operation preparation) and for 10 minutes after the
completion of defrosting operation and oil return (heating operation).
[For 24~30 HP class units]
The oil equalization operation is conducted in the following steps.
Remarks
!
The oil equalization operation is not activated during soft start, oil return operation and
defrosting operation (including defrosting operation preparation), and for 10 minutes after
the completion of defrosting operation and oil return (heating operation).
2 min 2 min
16~20HP model
62Hz+OFF 37Hz+ON
STEP1
STEP2
STEP3
STEP3-1
71Hz+ON+OFF
STEP3-2
41Hz+OFF+ON
STEP3-3
71Hz+OFF+ON
STD1 ON
STD2 ON
&
110 cumulative minutes of above operations
120 sec time-up
PI control resumes
at 71 Hz + ON + OFF
&
OR
120 sec
60 sec
120 sec
• Thermostat OFF
• Upper limit frequency
at 37 Hz + ON + OFF
• STD1 ON and STD2 ON remain for 30 continuous seconds
• Not in oil return operation (including preparation operation)
• Not in defrosting operation (including preparation operation)
• Elapsed time of 10 minutes or more after oil return (heating operation)
completion
• Elapsed time of 10 minutes or more after defrosting operation
completion
(V0821)