CVHE-SVX005C-EN
43
Figure 25. Arrangement for rupture disk relief piping
Alternate
Outside
wall
Support
this pipe
Purge discharge
vent line
Rupture disk
assembly
Flexible
steel
connection
1/4 in. FL x 1/4 in. NPT
drain valve
Drip leg
(length as required
for easy access)
Important: On the purge discharge vent line, the purge
exhaust connection point MUST be lower than
the purge height. Do NOT create a U-trap;
extend to drip leg if necessary to avoid a trap.
Note: The drip leg is REQUIRED. The drip leg should be a
minimum of 1 gal (3.8 L) capacity and must be
drained periodically for proper chiller purge
operation.
Notes:
• If a RuptureGuard™ is to be installed, remove
and discard the factory-installed rupture disk;
for more information, refer to Installation,
Operation, and Maintenance: RuptureGuard
Pressure Relief System Option (CTV-SVX06*-
EN).
• The rated flow capacity of the RuptureGuard™
disk/valve assembly is based on having straight
pipe extending past the spring mechanism
downstream of the valve. Be sure there are no
crosses (a derate on the rated flow capacity for
this configuration is published in RuptureGuard
Selection Guide Engineering Bulletin [E/CTV-
EB-10]), elbows, tees or any other obstructions
within the first 9 in. (228.6 mm) of valve
discharge. Refer to ASHRAE Standard 15 for
additional requirements on piping rupture disk
and relief valve vent lines.
Figure 26. RuptureGuard external vent line and drip
leg (not provided)
Metal
RuptureGuard
disk
Purge
exhaust
Flange
Vent to
outdoors
Flange
Drain
line
Chiller
flange
Drain
valve
Drip
leg
Important: The purge exhaust line MUST be connected to the
downstream side piping to vent purge exhaust out the vent line
to the outdoors; it may need to be extended to the drip leg.
Field-acquired tubing may be required to extend to the
field-supplied vent piping, depending on distance. Do NOT
create a U-trap in the purge exhaust line; this line MUST be
sloped from purge (highest point toward field-supplied piping,
lower point toward connection) to allow proper draining of any
condensation.
Notes:
• Use Loctite® 242 or Loctite® 277 on all
threaded joints on chillers charged with
refrigerant; use of other pipe thread sealants is
NOT recommended. Ensure all threaded pipe
joints are properly cleaned and prepared before
assembly. An alternative to the use of Loctite®
is to thread and weld the inlet adapter to the
pipe. Care must be taken to ensure that the
flange mating surface remains flat. Do NOT
weld on the Inlet Adapter flange while
connected to the RuptureGuard™.
• The drip leg is REQUIRED. The drip leg should
be a minimum of 1 gal (3.8 L) capacity and
must be drained periodically for proper chiller
purge operation.
Important: If a RuptureGuard™ is to be installed, it MUST
be installed properly. Failure to properly install
RuptureGuard™ will likely result in a start-up
delays and required rework and expenses that
result from a failure to properly install
RuptureGuard™ will NOT be paid by Trane.
Vent Piping
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