Samsung AM BXVGFH/AA Series Technical Data Book page 13

Design Procedure & Combination Ratio
Combination Ratio (Connection Ratio)
Allowable CR limit to avoid abnormal sound level risks in heating operation
f If the CR exceeds 130%, in a specific case of heating operation, an indoor unit may have higher sound level than
the level specified in the technical documents.
f In order to minimize the sound level, the system minimum operation ratio needs to be verified and considered as
follows:
※ Operation Ratio(%), OR
• Heat Pump system, H/P
Sum of nominal capacity of indoor units running in heating mode
OR (H/P) (%) =
• Heat Recovery system, H/R
Sum of nominal capacity of indoor units running in both cooling & heating mode
OR (H/R) (%) =
The Minimum Operation Ratio should be determined during the project design stage using Fig. 2.
Outdoor unit
Indoor unit
Operation Ratio
10%
20%
30%
200%
190%
180%
170%
160%
150%
140%
130%
5%
Fig. 2 Allowable CR with respect to indoor unit type as operation ratio increases
Sum of nominal capacity of indoor units
Sum of nominal capacity of indoor units
All capacities of H/P & H/R (Single, Dual and Triple Module Systems)
All indoor unit types
Nominal Capacity ≤ 18kBtu/h
150%
161%
171%
Nominal Capacity ≤ 18,000Btu/h
Nominal Capacity > 18,000Btu/h
Wall-mounted(all ranges)
10%
Minimum Operation Ratio in Heating
except Wall-Mounted
*)
Nominal capacity > 18kBtu/h
158%
170%
184%
15% 20%
* 100%
* 100%
Wall-Mounted
All capacities
141%
155%
173%
25% 30%