Vent Line Sizing Reference - Trane CenTraVac CVHE Installation, Operation And Maintenance Manual

Vent Piping

Vent Line Sizing Reference

Table 12. "C" values used to determine rupture disk vent line sizes; for use with the following figure
Evap. Size (EVSZ) Cond. Size (CDSZ)
032S 032S
032S 032L
032L 032L
050S 050S
050S 050L
050L 050L
050S 080S
050L 080L
080S 080S
080S 080L
080L 080L
080L 142L
142M 142L
142L 142L
142E 142L
210L 210L
250E 250L
210D 210D
250D 250D
250M 250M
250X 250X
Notes:
1. Rupture disk diameter is 3 in. (76.2 mm), with the exception of 250E evaporator/250L condenser units with heat recovery which have a rupture disk diameter of 4 in.
(101.6 mm).
2. 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" values to this total. With this new sum, refer to the following figure to
determine the vent-line pipe diameter.
3. If piping multiple rupture disks to a common vent line, first determine the total "C" value for each rupture disk, then add all "C" values together and apply the result to the
following figure.
4. RuptureGuard™ size based on "C" value:
3-in. (76.2 mm) valve: "C" value 0 to 104.20
4-in. (101.6 mm) valve: C value 104.21 to 223.9
RuptureGuard™ is not available for 250E evaporator/250L condenser units with heat recovery.
44
Total "C" Value Short H.R. Cond.
50.00
61.32 18.87
65.09
64.20
72.10 23.55
83.17
69.71
N/A
90.52
86.48
96.22 29.06
111.50
117.53 N/A
127.49
134.89
51.01
143.11
149.91
175.74 N/A
112.93
122.62
N/A
146.36
164.74
"C" Values for Unit Components
Long H.R. Cond.
25.19
31.45
N/A
38.80
N/A
56.80
62.12
N/A
Free Cooling Econ.
Aux. Cond.
15.30 3.66
15.30 5.50
N/A N/A
15.30 5.38
N/A N/A
15.30 7.13
15.30 N/A
15.30 7.13
15.30 N/A
CVHE-SVX005C-EN