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9
Connection Ratio:
»
Both indoor & outdoor units have a Capacity Index number
(e.g. FXMQ
30
PBVJU indoor unit & RXYQ
192
TTJU outdoor unit)
Total sum of IDU
index numbers
÷
ODU index number
=
CONNECTION RATIO
»
This ratio is defined as a percentage:
Example: 8 x FXMQ
30
P connected to 1 x RXYQ
192
T=
240 / 192 = 1.25
–
Therefore the Connection Ratio = 125%
System Diversity:
System DIVERSITY is the difference between the Maximum System
Load demand and the Maximum Capacity of the outdoor unit,
at design conditions
»
The VRVXpress tool can define diversity - also as a percentage
Example: 8 x FXMQ30P connected to 1 x RXYQ168T
–
Maximum Load required at any given time:
170,269 btu
–
Maximum Capacity of the ODU at design conditions:
166,315 btu
–
VRV defines the DIVERSITY of the system at:
-2%
»
In this example, if the maximum load is called for, the outdoor unit
will fall short of demand by 3,954btu – This VRV design has a 2%
system diversity
In Summary:
Connection Ratio does NOT indicate the diversity of a VRV
system. Use of the VRVXpress selection tool will indicate
clearly if selected equipment has a system diversity or not.
System Diversity & Connection Ration – What's the Difference?
Summary of Contents for VRV
Page 1: ...VRV Reference Guide ...
Page 4: ......
Page 5: ...System Overview ...
Page 18: ...Piping and Electrical Wiring Guide Condensing Unit Pipe Connections 18 ...
Page 22: ......
Page 23: ...System Selection ...
Page 41: ...Design Optimization ...
Page 53: ...Controls Standards ...
Page 65: ...65 Notes ...
Page 66: ...66 Notes ...
Page 67: ......