Outline of Control (Outdoor Unit) < Symbols using in this manual >
Si33-105
84
Function R407C PLUS Series Heat Recovery System
3.6
Oil Return/Defrost Operation
3.6.1
Oil Return Operation
Activates the oil return operation to collect refrigerant oil from the field pipes when the following
conditions are met.
[Start conditions]
1. When cumulative compressor operating time from power ON exceeds 2 hours
2. When cumulative compressor operating time from completion of previous return operation
exceeds 8 hours.
However, when the upper-limit frequency is limited to less than “A” Hz during the previous oil
return operation, the above time period of 8 hours is changed to 4 hours.
The oil return operation is activated every 1 hour during 3.6.5 “Cooling overload control”.
"
1)When defrost control operation for more than 4 minutes with inverter compressor frequency
of “A” Hz or higher, oil return time reset to 8 hours.
2) When condition 1. or 2. is satisfied during heating operation, the electric heaters of indoor
units are turned off 2 minutes prior in order to prepare for the oil return operation.
3) The oil return operation is not activated for 28 minutes after the completion of the previous
defrosting operation.
4) When Th7-Te<10 (30 seconds or more) during defrosting operation, oil return timer is reset.
5) The oil return operation is not activated during DSHi<20 and for 10 minutes after going out of
DSHi<20. (The oil return operation is activated after the cancellation of this condition.)
6) When the compressor operation sequence comes to the oil return operation during startup
control, the oil return operation is activated from the preparation after the completion of
startup control.
[Oil return operation]
!
The oil return operation is shown on following pages.
[Ending conditions]
!
The oil return operation ends after 4 minutes of operation. However, when the compressor
stop conditions are met during an oil return operation, the compressor stops after the
completion of the oil return operation.
When the compressor stops during an oil return preparation operation, the oil return
operation is activated at the next startup.
[Compressor frequency during oil return operation]
HP
Oil return operation
A
B
C
D
E
INV
STD1 STD2
INV
STD1 STD2
INV
STD1 STD2
INV
INV
STD1
16HP 71Hz
OFF
—
52Hz
OFF
—
52Hz
ON
—
64Hz 41Hz
ON
—
18HP 71Hz
OFF
—
52Hz
OFF
—
71HZ
ON
—
64Hz 64Hz
ON
—
20HP 71Hz
OFF
—
52Hz
OFF
—
71Hz
ON
—
64Hz 64Hz
ON
—
24HP 52Hz
ON
OFF
41Hz
ON
OFF
52Hz
ON
ON
64Hz 41HZ
ON
ON
26HP 52Hz
ON
OFF
41Hz
ON
OFF
52Hz
ON
ON
64HZ 41Hz
ON
ON
28HP 52Hz
ON
OFF
41Hz
ON
OFF
52Hz
ON
ON
64HZ 41Hz
ON
ON
30HP 52Hz
ON
OFF
41Hz
ON
OFF
52Hz
ON
ON
64HZ 41Hz
ON
ON
Summary of Contents for R407C PLUS
Page 1: ...System R407C PLUS Series Heat Recovery System Si33 105 Service Manual ...
Page 11: ...Introduction Si33 105 x ...
Page 41: ...Specifications Si33 105 30 Specifications R407C PLUS Series Heat Recovery System ...
Page 147: ...Test Operation Si33 105 136 Test Operation R407C PLUS Series Heat Recovery System ...
Page 263: ...Si33 105 iv Index ...
