R-Pro › Field cases › Air conditioning
Multi-Split Load Balancing — 4+ Indoor Unit Optimization
Likely causes
1 outdoor + 4+ indoor units = simultaneous load distribution
Check: **Shop/office 4 rooms + multi system**: ① Rated load = outdoor BTU 100% (e.g. 24k BTU = 5+5+7+7=24k indoor). ② Simulated load = indoor sum ≤130% recommended (LG/Samsung policy). ③ One unit full / others weak = load distribution fault. ④ Compressor RPM 0-120Hz auto-adjust. **Imbalance symptoms**: ① Living cool / other rooms weak. ② Outdoor RPM full sustained, +30% energy. ③ Farthest indoor = 70% capacity (pipe pressure loss). ④ 'Set 24°C, actual differs' = EEV not synced.
What to do: **Optimization**: ① **EEV sync** = outdoor main board service mode auto-calibration (LG: 'EEV Calibration', Samsung: 'Auto Address+Sync'). ② **Verify pipe lengths** = >25m farthest unit needs extra insulation. ③ **DIP address reset** = priority (living first, small rooms after). ④ **Mode mix** = 'cool' vs 'cool+dehumidify' alters load balance. **Recommended**: season start → all units run 1 hr simultaneously, measure pressure/temp/current. Ask 'different rooms different temps OK?' to decide simultaneous vs zoned strategy.
Korean shops/offices = 60%+ multi-split. Homes = mostly single split or 2-multi. 4-multi = shops/pensions. Pre-season (Apr) check = optimize load distribution = -50% Jul-Aug heatwave complaints. LG/Samsung service mode = certified techs only (5-yr install card).
All 565 cases work offline in R-Pro, with error codes for 62 brands and P-T data for 108 refrigerants.
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