Trane CVHE Installation, Operation And Maintenance Manual page 32

Vent Piping
• Provide a drip leg on the vent-line (see
p. 32). Provide a standard 1/4-in. FL x 1/4-in. NPT,
capped refrigerant service valve to facilitate liquid
removal.
NOTICE:
Equipment Damage!
Trane assumes no responsibility for equipment damage
caused by insufficient drainage of the drip leg. All vent-
lines must be equipped with a drip leg of sufficient
volume to hold the expected accumulation of water
and or refrigerant. The drip leg must be drained
periodically to ensure that it does not overflow and
allow fluid to flow into the horizontal portion of the
vent-line.
• Consult local regulations and codes for any additional
relief line requirements and refer to Refrigerant
Handling Guidelines (CTV-SVX05*-EN, or the most
recent version).
Figure 19. Illustrates rupture disk location, cross
section of rupture disk
Outside pipe
Gasket
assembly
Suction connection
Cap
Bolt
Note: Pipe connection is 3 in. NPT, except 250E evap/250L cond units with
heat recovery which have a 4 in. NPT pipe connection.
1
A derate on the rated flow capacity for this configuration is published in E/CTV-EB-10 (Engineering Bulletin: RuptureGuard™ Selection Guide).
32
Figure 20,
Rupture disk
Figure 20. Arrangement for rupture disk relief piping
Outside
wall
Support
this pipe
Flexible
steel
connection
1/4 in. FL x 1/4 in. NPT
drain valve
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, or the most recent version).
• 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
obstructions within the first nine inches of valve
discharge. Refer to ASHRAE Standard 15 for additional
requirements on piping rupture disk and relief valve
vent lines.
Alternate
Purge discharge
vent line
Rupture disk
assembly
Drip leg
(length as required
for easy access)
1
, elbows, tees or any other
CVHE-SVX02H-EN