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Note: Make sure there are no crosses (a derate on the
rated flow capacity for this configuration is
published in Engineering Bulletin: RuptureGuard
Selection Guide [E/CTV-EB-10]), elbows, tees,
or any other obstructions within the first 9 in.
(22.86 cm) of valve discharge. Refer to ASHRAE
Standard 15, national, state, and local codes for
additional requirements on piping rupture disk
and relief valve vent lines.
Figure 27. External vent line and drip leg (not
provided)
Purge exhaust
Rupture disk
Inlet flange
Drain line
Note: The drip leg is REQUIRED. The drip leg should be a
minimum of 1 gal (3.8 L) capacity and must be
drained periodically for proper chiller purge
operation.
CDHH-SVX003C-EN
Flange
Outlet flange
Drain valve
Important: If a RuptureGuard™ is to be installed, it MUST
be installed properly. Failure to properly install
the RuptureGuard™ will likely result in a start-
up delays and required rework and expenses
that result from a failure to properly install the
RuptureGuard™ will NOT be paid by Trane.
Vent Line Sizing Reference
Table 13. "C" values used to determine rupture disk
vent line sizes (lb/min); for use with the
following figure
Evap.
Cond.
Size
Size
NTON
(EVSZ)
(CDSZ)
2000–2600
400M
440M
2800–3300
440M
440M
2800–3300
440X
440X
Notes:
1.
Rupture disk diameter is 3 in.
2.
Use the total "C" value in the following figure to determine the vent line
pipe diameter.
3.
If piping multiple rupture disks (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 following figure.
4.
The CDHH unit is a Duplex™ chiller and has (2) refrigerant circuits and
(2) relief devices. The "C" values shown in the table above are per
circuit values.
Vent Piping
"C" Values for Unit Components
Total
Evap. Cond. Econ.
"C"
Tank
Value
142.6
65.7
54.0
18.5
151.1
72.7
54.0
19.8
170.5
83.9
62.3
19.8
Oil
4.5
4.5
4.5
39
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