Trane CVHH Installation, Operation And Maintenance Manual page 35

Figure 22. External vent line and drip leg (not provided)
Purge
Exhaust
Rupt ure
Disk
I nlet
Flange
Drain Line
Connect the discharge of the valve assem bly to the vent
line connected to the outdoors.
N ot e: M ake sure there are no crosses
or any other obstructions w ithin the first
22.86 cm (9 in.) of valve discharge. Refer to
ASHRAE Standard 15, national, state, and local
codes for additional requirem ents on piping
rupture disk and relief valve vent lines.
Table 8. "C" values used to determine rupture disk vent
line sizes (kg/ s); for use w ith
Eva p. Con d.
Size Siz e
N TON ( EVSZ) ( CD SZ)
900–1200 100M 100M
900–1200 100L 100L
900–1200 130M 130M
900–1200 160M 200M
900–1200 200L 220L
900–1200 220L 220L
1500- 1700 200L 200L
1500- 1700 220L 220L
900–1200 100M 10HM
900–1200 130M 13HM
900–1200 160M 20HM
1500- 1700 200L 20HL
1500- 1700 220L 22HL
Notes:
1 . Rupt ure disk diam et er is 76.2 m m ( 3 in.) .
2 . Use t he t ot al " C" value in Figure 23, p. 36
pipe diam et er.
3 . I f piping m ult iple rupt ure disks ( m ult iple unit s) t o a com m on vent
line, first det erm ine t he t ot al " C" value for each unit , and t hen; add
all " C" values t oget her and apply t he result t o
4 . The CVHH unit is a Sim plex chiller and has ( 1) refrigerant circuit and
( 1) r elief device.
1
A derate on the rated flow capacity for this configuration is published in RuptureGuard engineering bulletin, E/CTV-EB-10.
CVHH-SVX001A-EN
Flange
Out let Flange
Drain Valve
1
, elbow s, tees
Figure 23, p. 36
"C" V a lu e s for Un it Com pon e n t s
Tot a l
"C"
Va lu e Eva p. Con d. Econ . Ta n k
0.853 0.368 0.310 0.141 0.034
0.939 0.415 0.349 0.141 0.034
0.932 0.412 0.346 0.141 0.034
1.022 0.461 0.386 0.141 0.034
1.222 0.575 0.473 0.141 0.034
1.284 0.637 0.473 0.141 0.034
1.195 0.575 0.435 0.151 0.034
1.295 0.637 0.473 0.151 0.034
0.967 0.368 0.424 0.141 0.034
1.053 0.412 0.467 0.141 0.034
1.144 0.461 0.509 0.141 0.034
1.332 0.575 0.573 0.151 0.034
1.458 0.637 0.637 0.151 0.034
t o det erm ine t he vent line
Figur e 23, p. 36.
Oil
Vent Piping
35