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10
Key Points for Selection
Obtain Project Data
Before selection of any VRV system, a minimum amount of information
is required for accurate equipment selection and to apply an
optimized design
For an accurate selection of indoor units the following information is required:
For an accurate selection of outdoor units the following information is required:
PEAK
Cooling Loads
PEAK
Heating Loads
DESIGN AIR
Conditions
»
Engineers will
usually provide
both Total &
Sensible loads
which should
be entered
»
However it is
possible to select
equipment using
only Total or
Sensible load
»
Required when
either Heating
is the dominant
operation or the
heating design
condition is
below 32°F
»
The dry & wet bulb
temperature entering
the coil
»
Also known as
“air-on” or “mixed air”
conditions
»
Nominal conditions are
typically 80 °F db &
67 °F wb but rarely
reflect actual conditions
»
Design air-on can also
be given as db/RH%
(e.g. 74°F & 50% RH)
AMBIENT Conditions
PIPE LENGTH
»
The design ambient
temperature for the
location of the project
»
Both engineers and D&B
contractors should have
this information
»
If this information is not at
hand then use ASHRAE
standard design conditions
for the location
»
The estimated distance between
the outdoor unit and the furthest
indoor unit
»
This is the linear length from one
point to another NOT the total
amount of piping
»
Both engineers and D&B
contractors should be able to pin
point the outdoor unit location
»
Be sure to calculate and include
the vertical height between
outdoor & furthest indoor unit
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: ......