Samsung Max Heat DVM S2 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
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.
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%
except Wall-Mounted
*)
Nominal capacity > 18kBtu/h
158%
170%
184%
15% 20%
* 100%
* 100%
Wall-Mounted
All capacities
141%
155%
173%
25% 30%