Table 7 - "C" Values Used To Determine Rupture Disc Vent Line Sizes - Trane CVHE Installation Manual

Table 7. "C" values used to determine rupture disc vent line sizes – CVHE, CVHF and CVHG
Evaporator Condenser
Size Size
(EVSZ) (CDSZ)
(3) (4)
032S 032S
032S 032L
032L 032L
050S 050S
050S 050L
050L 050L
080S 080S
080S 080L
080L 080L
142E 142L
142M 142L
142L 142L
210L 210L
250E 250L
Notes:
1. 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 Figure 13 to
determine the vent line pipe diameter.
2. If piping multiple rupture discs (multiple units) to a common vent line, first determine the total "C" value for each unit, and then; add all "C" values together and
apply the result to the "vent pipe sizing chart" in Figure 13.
3. EVSZ = Evaporator Shell Size;
S = Short Shell
L = Long Shell
E = Extended Shell
M = Medium
4. CDSZ = Condenser Shell Size;
S = Short Shell
L = Long Shell
E = Extended Shell
*N/A = Not Available
22
Vent Piping
Rupture Evaporator Standard
Disc Condenser
Diameter
3" (76 mm) 26.25
3" (76 mm) 26.25
3" (76 mm) 35.04
3" (76 mm) 33.05
3" (76 mm) 33.05
3" (76 mm) 44.13
3" (76 mm) 45.59
3" (76 mm) 45.59
3" (76 mm) 60.86
3" (76 mm) 74.30
3" (76 mm) 58.47
3" (76 mm) 68.86
3" (76 mm) 75.16
3" (76 mm) 93.81
"C" Values for Unit Components
Economizer
Condenser Condenser
18.87
25.19 4.85
25.19
23.56
31.45 7.44
31.45
29.06
38.80 11.63
38.80
50.50
50.50
50.50 17.40
56.72
62.12
Short Long Auxiliary
H.R. H.R. Condenser
18.87 25.19 15.28
23.56 31.45 15.28
29.06 38.80 15.28
Design
Special
N/A* 50.50 15.28
N/A*
56.72
With
Free
Cooling
4.16
6.16
5.87
Design
Special
7.10
CVHE-SVN02D-EN