Panasonic Urban Multi MX1R Series Service Manual page 454

PACD011001C2
3.1.9 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
„ Oil equalization operation --- Upper-limit frequency is controlled to the following value.
16~20HP model
∗ The oil equalization operation is not activated during soft start, oil return operation and defrosting
[For 24~30 class units]
„ The oil equalization operation is conducted in the following steps.
STEP1
&
110 cumulative minutes of above operations
STEP2
&
STEP3
STEP3-1
71Hz+ON+OFF
STEP3-2
41Hz+OFF+ON
STEP3-3
71Hz+OFF+ON
Function UM Combination "MA1R Series" Using R-407C
continuous hours.
2 min
62Hz+OFF
operation (including defrosting operation preparation) and for 10 minutes after the completion of
defrosting operation and oil return (heating operation).
STD1 ON
STD2 ON
• 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
120 sec
60 sec
120 sec
2 min
37Hz+ON
TMC time-up
PI control resumes
at 71 Hz + ON + OFF
Outline of Control
• Thermostat OFF
OR
• Upper limit frequency
at 37 Hz + ON + OFF
(V0821)
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