Trane CenTraVac CVHE - Vent Line Sizing Reference

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CVHE-SVX005C-EN

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)

“C” Values for Unit Components

Total “C” Value Short H.R. Cond.

Long H.R. Cond.

Aux. Cond.

Free Cooling Econ.

032S 032S 50.00

18.87 25.19 15.30 3.66032S 032L 61.32

032L 032L 65.09

050S 050S 64.20

23.55 31.45 15.30 5.50050S 050L 72.10

050L 050L 83.17

050S 080S 69.71

N/A N/A N/A N/A

050L 080L 90.52

080S 080S 86.48

29.06 38.80 15.30 5.38080S 080L 96.22

080L 080L 111.50

080L 142L 117.53 N/A N/A N/A N/A

142M 142L 127.49

51.01 56.80 15.30 7.13

142L 142L 134.89

142E 142L 143.11

210L 210L 149.91

250E 250L 175.74 N/A 62.12 15.30 N/A

210D 210D 112.93

N/A N/A

15.30 7.13

250D 250D 122.62

250M 250M 146.36

15.30 N/A

250X 250X 164.74

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