General Air Conditioning | VRF Technical Reference
VRF Outdoor Function Settings
Applicable series: VR-II, V-III, V-II, J-IIIL, J-III, J-II and J-IIS
Important: Function settings must only be changed by trained technicians. Stop the system before entering function-setting mode. Do not alter any item marked Prohibited. Settings identified as unavailable for Slave outdoor units must only be changed at the Master outdoor unit.
How to use this article: Select the correct VRF series first, then confirm the LED105 setting-mode code, LED104 function code, allowed setting value and whether the adjustment is permitted on the Master or Slave outdoor unit.
1. Accessing Function Setting Mode
| Step | Action | Expected display |
|---|---|---|
| 1 | Stop outdoor-unit operation and confirm normal system status. Remove the front panel and electrical component-box cover as required. | LED105 and LED104 indicate normal status. |
| 2 | Press MODE/EXIT (SW107) once. | Mode-selection display opens. |
| 3 | Press SELECT (SW108) until F2 appears on LED104. | LED104 = F2. Do not select F1 or F9 during normal setting work. |
| 4 | Press ENTER (SW109). | Function mode is confirmed. |
| 5 | Use SW108 to select the LED105 setting-mode code, then press SW109. Use SW108 again to select the LED104 function value, then press SW109 to confirm. | Flashing display becomes steady when accepted. |
| 6 | Press SW109 after completion, then press SW107 to exit. | Returns to normal display. |
Do not guess a code. The same LED105 code can have different meanings between VRF generations. Always use the table for the exact series being serviced.
2. VR-II Series
| LED105 | Function | LED104 values | Key notes |
|---|---|---|---|
| 00 | Pipe length | 00 Standard 40–65 m; 01 Short <40 m; 02 Medium 65–90 m; 03 Long 1 90–120 m; 04 Long 2 120–165 m | Length between Master outdoor unit and nearest indoor unit. |
| 10 | Sequential start shift | 00 Normal; 01 21 sec; 02 42 sec; 03 63 sec | Used to stagger multiple outdoor-unit starts and reduce starting current. |
| 11 | Cooling capacity shift | 00 Normal; 01 Save 1; 02 High Power 1; 03 High Power 2 | Capacity performance adjustment. |
| 12 | Heating capacity shift | 00 Normal; 01 Save; 02 High Power 1; 03 High Power 2 | Heating-only capacity adjustment. |
| 20 | External stop logic | 00 Batch stop; 01 Emergency stop | Selects behaviour of external input terminal. |
| 22 | Snow-falling protection fan mode | 00 Enable; 01 Disable | Periodic fan operation to reduce snow coverage. |
| 23 | Snow-fan interval | 00 30 min; 01 5 min; 02 10 min; 03 20 min | Available when snow-falling protection is enabled. |
| 24 | High static pressure | 00 Standard; 01 High 1 ≈30 Pa; 02 High 2 ≈80 Pa | Use when a discharge duct creates external static pressure. |
| 30 | Energy-saving level | 00 Level 1 stop; 01 Level 2 40%; 02 Level 3 60%; 03 Level 4 80%; 04 Level 5 100% | Selected via external peak-cut input; capacity percentage refers to operating limit. |
| 40–42 | Low-noise functions | 40 capacity priority Off/On; 41 low-noise Off/On; 42 Level 1/Level 2 | Level 1 lowers sound by about 3–5 dB(A); Level 2 by about 5–8 dB(A), model dependent. |
| 60 | Recovery operation | 00 On; 01 Off | Check system-specific requirement before changing. |
3. V-III Series
The V-III series shares many VR-II functions, but includes additional operation-priority and height-difference settings.
| LED105 | Function | Values | Notes |
|---|---|---|---|
| 00 | Pipe length | Standard 40–65 m; Short <40 m; Medium 65–90 m; Long 1 90–120 m; Long 2 120–165 m | Confirm actual piping. |
| 10–12 | Sequential start and capacity shifts | Same basic ranges as VR-II | Master-only where indicated. |
| 17 | Height difference between units | 00 Standard; 01 Prohibited; 02 High difference | Use High difference when the indoor unit is higher than the outdoor unit and the height difference exceeds 40 m. |
| 20 | Batch stop / Emergency stop | 00 Batch; 01 Emergency | External stop-input behaviour. |
| 21 | Operation mode priority | 00 First command; 01 External input of outdoor unit; 02 Administrative indoor unit | Select only one valid priority strategy. |
| 22–24 | Snow protection, interval and static pressure | As listed in the series manual | High static pressure offers approximately 30 Pa and 80 Pa selections. |
| 30 | Energy-saving level | Stop, 40%, 60%, 80%, 100% | Used with external peak-cut input. |
| 40–42 | Low-noise priority, enable and level | Off/On; Level 1/Level 2 | Capacity may be reduced while low-noise mode is active. |
4. V-II Series
| LED105 | Function | Values | Notes |
|---|---|---|---|
| 00 | Pipe length | Standard, Short, Medium, Long 1, Long 2 | Same distance bands as VR-II. |
| 10–12 | Sequential start, cooling shift, heating shift | Normal / Save / High Power selections | Follow exact LED104 value for required performance. |
| 20 | Batch stop / Emergency stop | 00 Batch; 01 Emergency | External stop-input logic. |
| 21 | Operation mode priority | 00 First command; 01 Outdoor external input; 02 Administrative indoor unit | Determines which control source sets system mode. |
| 22 | Snow protection fan mode | 00 Normal; 01 Protection fan mode | Used in snow-prone sites. |
| 23 | Snow-fan interval | 30, 5, 10 or 20 minutes | Only relevant when protection mode is enabled. |
| 24 | High static pressure | Standard; High 1 ≈30 Pa; High 2 ≈80 Pa | For discharge-duct installations. |
| 30 | Energy-saving level | Stop, 40%, 60%, 80%, 100% | Peak-cut capacity control. |
| 40–42 | Low-noise settings | Capacity priority, low-noise enable, Level 1/2 | Level selections may reduce available capacity. |
| 60 | Recovery operation | On / Off | Applicable only to supported multi-compressor configurations. |
5. J-IIIL, J-III and J-II Series
| LED105 | Function | Values | Notes |
|---|---|---|---|
| 00 | Pipe length | 00 Standard 40–65 m; 01 Short <40 m; 02 Medium 65–90 m; 03 Long 90–120 m | LED104 value 04 is prohibited. |
| 11 | Cooling capacity shift | 00 Normal; 01 Save 1; 02 High Power 1; 03 High Power 2 | 04 prohibited. |
| 12 | Heating capacity shift | 00 Normal; 01 Save; 02 High Power 1; 03 High Power 2 | 04 prohibited. |
| 20 | Batch stop / Emergency stop | 00 Batch; 01 Emergency | External input behaviour. |
| 21 | Operation mode priority | 00 First command; 01 Outdoor external input; 02 Administrative indoor unit | Choose based on the project control strategy. |
| 30 | Outdoor-unit capacity save | Level 1 stop through Level 5 | Selected by external input terminal CN133 when energy-saving function operates. |
| 40–42 | Low-noise settings | Capacity priority Off/On; Low-noise Off/On; Level 1/2 | Level 2 is marked J-IIIL only in the source manual. |
J-IIIL demand control: The source manual contains a separate power-limit calculation and current-release setting table for demand-control kits. These values depend on outdoor-unit rated input and model capacity. Do not apply generic current limits; calculate and record the value for the exact outdoor-unit model.
6. J-IIS Series
| LED105 | Function | Values | Notes |
|---|---|---|---|
| 11 | Cooling capacity shift | 00 Normal; 01 Save 1; 02 High Power 1; 03 High Power 2 | Other values prohibited. |
| 12 | Heating capacity shift | 00 Normal; 01 Save; 02 High Power 1; 03 High Power 2 | Other values prohibited. |
| 17 | Height difference | 00 Standard; 02 High difference | Use when indoor units are higher than the outdoor unit and the difference exceeds 40 m. |
| 20 | Batch stop / Emergency stop | 00 Batch; 01 Emergency | External input behaviour. |
| 21 | Operation mode priority | 00 First command; 01 Outdoor external input; 02 Administrative indoor unit | Determines operating-mode authority. |
| 30 | Outdoor-unit capacity save | Level 1 stop through Level 5 | External-input capacity limit. |
| 40–41 | Low-noise priority and enable | Off/On | No separate Level 2 setting is listed for J-IIS in this source. |
7. Electricity Meter Settings
The manual uses LED105 codes 70–73 to build the electricity-meter number and pulse setting for a meter connected to CN135. The available meter-number range is generally 0001–9999. Meter numbers 000 and 201–299 may make pulse input ineffective on applicable series. Confirm the exact restrictions for the outdoor-unit generation.
| LED105 | Purpose | Typical entry |
|---|---|---|
| 70 | Meter number – ones and tens digits | x00 to x99 |
| 71 | Meter number – hundreds digit | 0xx to 9xx |
| 72 | Pulse setting – lower digits | x000 to x999 |
| 73 | Pulse setting – thousands digit | 0xxx to 9xxx |
8. Commissioning and Recordkeeping
- Confirm the exact outdoor-unit series and whether the unit is Master or Slave.
- Record the original LED105 and LED104 values before changing anything.
- Change only one function at a time and confirm the display becomes steady.
- Run the system and confirm capacity, noise, pressure and control behaviour.
- Record final settings in the commissioning report and retain them with the project BAK/service records.
Escalate before changing: prohibited codes, demand-control current limits, recovery-operation settings, or any value that does not match the exact outdoor-unit service manual.
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Australia: 1300 364 484
New Zealand: +64 4 568 8761