2WAY SYSTEM
Control Functions - Outdoor unit
1 - 26
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7. Oil Control
2WAY VRF SYSTEM
Control Functions
(5)
5-1.
System Oil Recovery Control
The system oil recovery control is performed by operating all the systems.
If the stopped outdoor unit exists, the unit starts operating and the system oil recovery control is performed.
Start of system oil recovery control
When one of the oil level of compressors is “0”, the system oil recovery control will start.
When the accumulated time reaches 60 minutes under the condition of oil level “1” or lower, the system oil
recovery control will start.
This timer will be cleared when the oil level “2” continues for 5 minutes.
* If any compressor oil level “2” remains in the same outdoor unit even though one compressor oil level “0” exists,
this oil recovery control is not performed.
When the system oil recovery control is once performed, it will not be resumed for 30 minutes.*
System oil recovery control is performed. System oil recovery is not performed.
compressor
compressor
Outdoor unit
Oil level “2” does NOT exist. Oil level “2” exists.
Oil level
12
compressor
compressor
Outdoor unit
Oil level
01
compressor
compressor
Outdoor unit
Oil level
12
compressor
compressor
Outdoor unit
Oil level
02
2WAY VRF SYSTEM
Control Functions
7. Oil Control
For 2 minutes *
Indoor units
Control time
Outdoor units
MOV
RAP valve kit
Fan
All outdoor units operate at maximum horsepower.
MOV at all indoor units operate at a fixed pulse according to the indoor unit
capacity.
All indoor units operate in Cooling mode (OFF status).
Fan rotates at the set fan speed depending on the indoor unit operation mode
or at fan speed “LL”.
In the case of cooling mode
For 2 minutes *
Indoor units
Control time
Outdoor units
MOV
RAP valve kit
Fan
All outdoor units operate at more than half horsepower.
MOV at all indoor units operate at 250 pulses.
All indoor units operate in Heating mode (ON status.)
Fan rotates at the set fan speed depending on the indoor unit operation mode
or at fan speed “LL”.
In the case of heating mode
Pulse of MOV
Flap
For
D1, K1, K2
Except
D1, K1, K2
Type of
indoor unit
Operating
mode
of indoor unit
Thermostat
ON/OFF
Setting No. 0
EEPROM setting in main outdoor unit
CODE: 24
Setting No. 1
Stop
Fan
Cooling
Stop
Fan
Cooling
OFF
ON
OFF
ON
80 – 160
80 - 160
80 – 160
Present pulse+20
80 – 160
80 – 160
80 – 160
Present pulse+20
Fan speed
Stop
LL
Set speed
L
Stop
Stop
Set speed
L
Fan speed
LL
LL
Set speed
L
Stop
Stop
Set speed
L
Flap
Open
Open
5-2.
The system oil recovery control shall be performed as the flow mentioned below.
Normal operation → System oil recovery control → Normal operation
Simplified flow of system oil recovery control
(6) Indoor Unit Self Oil Recovery Control
This control is carried out regularly when the system is in cooling mode.
*In the case of pre-trip at the alarm display H07, hours will be extended.
During stopped, fan mode setting or thermostat OFF condition at the indoor unit, MOV of the indoor unit is opened
regularly for 1 minute (at an interval of once every 2 hours).
During the thermostat ON, MOV of the indoor unit is opened 20 pulses from the current status.
* MOV pulse might be different from the table listed above depending on the use conditions.
SM830253-00_欧州2way7_SM-TRSM.indb 26 16/08/26 19:23:18
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