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Thank for your explanations. I would like to confirm some outline as follow: 1. "The combination ratio curve is used to calculate a multiplier when the installed total indoor unit capacity is greater than the outdoor unit capacity. If the installed indoor unit capacity is less than or equal to the outdoor unit capacity, a combination curve is not required and the assumed multiplier is 1" it means that ever the total ID capacities is less than or even with OD unit, we still need to add curve of PLR >1 for the combination ratio curve. Simulation program would not use it when check current combination ratio less or even 1 . 2.from this [www.osti.gov/scitech/servlets/purl/1093843], there are some sample table and I want to check whether I rightly understand : table A4: Cooling Capacity Ratio Modifier Function of Low/High Temperature Curves and Cooling Energy Input Ratio Modifier Function of Low/High Temperature Curve Name ; table A5: Cooling Capacity/Energy Input Ratio Boundary Curve ; table A6: Cooling Energy Input Ratio Modifier Function of Low/High Part-Load Ratio Curve Name; table A7: Cooling Combination Ratio Correction Factor Curve Name (low for PLR <=1; high for PLR >1). Thanks

Thank for your explanations. I would like to confirm some outline as follow: 1.

1. "The combination ratio curve is used to calculate a multiplier when the installed total indoor unit capacity is greater than the outdoor unit capacity. If the installed indoor unit capacity is less than or equal to the outdoor unit capacity, a combination curve is not required and the assumed multiplier is 1" 1" it means that ever the total ID capacities is less than or even with OD unit, we still need to add curve of PLR >1 for the *the combination ratio curve. Simulation program would not use it when check current combination ratio less or even 1 . 1* .