CVHE-SVN02D-EN
20
Vent Piping
The flexible connector used to
isolate the rupture disc from
excessive vent line vibration must be
compatible with the refrigerant in
use. Use a flexible, steel connector
such as the stainless-steel type
(from Vibration Mounting and
Control, Inc.) or equivalent.
See Figure 12 for a recommended
relief piping arrangement.
Important: Vent pipe size must
conform to ANSI and ASHRAE
Standard 15, which discusses vent
pipe sizing.
Use Table 7 and then Figure 13 to
determine proper vent pipe size.
Note: To determine the total “C”
value for a specific unit, add the
appropriate “C” values for the
evaporator, standard condenser and
economizer. If the unit is equipped
with any options (e.g., heat recovery,
free cooling, or an auxiliary
condenser), add the applicable “C”
value(s) to this total.
With this new sum, refer to Figure 13
to determine the vent line pipe
diameter needed to handle flow.
4. Normally, where multiple chillers
are used, install a separate rupture
disc vent line for each unit.
5. Consult local regulations for any
special relief line requirements
and refer to Refrigerant Handling
Guidelines.
6. The discharge of the vent line
outside should not be in the
general vicinity of any fresh air
intakes to the building. Any gas
venting from the vent line should
not be allowed to re-enter the
building.
Figure 11. Illustrates rupture disc location, cross section of rupture disc and
recommended rupture disc relief piping
Cross Section of Rupture Disc
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