Trane CVHF User Manual

38
CVHE-SVX02M-EN
NNoottee:: To determine the total CC value for a specific
unit, add the appropriate CC 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 CC
value(s) for those options to the total as well.
NNoottee:: Table 12, p. 41 and Figure 27, p. 42 are
applicable only for non-manifolded vent-line
runs connected to a 15 psig (103.4 kPaG) rupture
disk relief device. The pipe length provided by
the table is in “equivalent feet.” The vent-line
length in equivalent feet is the sum of the linear
pipe length plus the equivalent length of the
fittings (e.g., elbows).
Vent Line Installation
IImmppoorrttaanntt:: Before constructing the rupture disk vent
line, consult local codes for applicable
guidelines and constraints.
All CenTraVac™ centrifugal chillers are equipped with
rupture disks. If refrigerant pressure within the
evaporator exceeds 15 psig (103.4 kPaG), the rupture
disk breaks and shell pressure is relieved as refrigerant
escapes from the chiller.
A cross-section of the rupture disk assembly appears in
Figure 24, p. 39 along with an illustration indicating the
location of the rupture disk on the suction elbow.
IImmppoorrttaanntt:: If a RuptureGuard
™ is to be installed,
remove and discard the factory-installed
rupture disk; for more information, refer to
Installation, Operation, and Maintenance:
RuptureGuard Pressure Relief System
Option (CTV-SVX06*-EN).
Several general recommendations for rupture disk vent
line installation are outlined as follows.
NNoottee:: If the rupture disk was removed for service or
vent-line piping installation, the rupture disk
must be reinstalled (as shown in Figure 24, p. 39).
Refer to the following procedure and contact
CenTraVac
™ Chiller Technical Service when
reinstalling the rupture disk.
• Verify that the vacuum support side of the rupture
disk is positioned as shown in the cross-section
view that appears in Figure 24, p. 39.
– Install the two bottom bolts though the pipe
flanges.
– Install the rupture disk with a gasket on each
side between the pipe flanges. Orient the disk
with the reference arrow or vacuum support bar
facing the chiller side as shown in Figure 24, p.
39.
– Install the two top bolts.
– Center the disk and gaskets to the flange bore.
– Hand-tighten all bolts assuring equal pressure.
– Use a torque wrench set to 240 in·lb (27.1 N·m)
with a 9/16-in. socket.
– Tighten bolts in a star pattern, one half turn
each, to maintain even pressure on the disk.
– Final torque on all bolts should be 240 in·lb
(27.1 N·m).
• When attaching the vent line to the chiller, do NOT
apply threading torque to the outside pipe of the
rupture disk assembly.
NNOOTTIICCEE
RRuuppttuurree DDiisskk DDaammaaggee!!
FFaaiilluurree ttoo ffoollllooww iinnssttrruuccttiioonn ccoouulldd rreessuulltt iinn
ddaammaaggee ttoo tthhee rruuppttuurree ddiisskk aasssseemmbbllyy..
DDoo nnoott aappppllyy tthhrreeaaddiinngg ttoorrqquuee ttoo tthhee oouuttssiiddee ppiippee..
• Provide support as needed for the vent line. Do
NOT use the rupture disk assembly to support the
vent-line piping.
• Use a flexible connection between the vent line and
the rupture disk assembly to avoid placing stress on
the rupture disk. (Stress can alter rupture pressure
and cause the disk to break prematurely.) The
flexible connector used to isolate the rupture disk
from excessive vent line vibration must be
compatible with the refrigerant in use. Use a
flexible, steel connector (such as the stainless-steel
type MFP, style HNE, flexible pump connector from
Vibration Mounting and Control, Inc.), or
equivalent. Refer to Figure 25, p. 40 for a
recommended relief piping arrangement.
• An individual vent line is normally installed for each
relief device. It is permissible to manifold the
rupture disks of several machines into a common
vent line provided that the appropriate ASHRAE
Standards and local code requirements for
manifolded relief devices are followed.
NNoottee:: Figure 25, p. 40 does NOT apply for
manifolded vent lines.
WWAARRNNIINNGG
PPrreessssuurree--RReelliieeff DDeevviiccee DDiisscchhaarrggee
HHaazzaarrdd!!
AAnn iimmpprrooppeerr vveenntt--lliinnee tteerrmmiinnaattiioonn ccoouulldd rreessuulltt iinn
ddeeaatthh oorr sseerriioouuss iinnjjuurryy oorr eeqquuiippmmeenntt ddaammaaggee..
WWhheenn aa pprreessssuurree--rreelliieeff ddeevviiccee ooppeerraatteess,, iitt ccoouulldd
ddiisscchhaarrggee aa llaarrggee aammoouunntt ooff fflluuiidd aanndd//oorr vvaappoorr..
UUnniittss MMUUSSTT bbee eeqquuiippppeedd wwiitthh aa vveenntt--lliinnee
tteerrmmiinnaattiioonn tthhaatt ddiisscchhaarrggeess oouuttddoooorrss iinn aann aarreeaa
tthhaatt wwiillll nnoott sspprraayy rreeffrriiggeerraanntt oonn aannyyoonnee..
VVeenntt PPiippiinngg

Trane CVHF Specifications

General

Brand	Trane
Model	CVHF
Category	Chiller
Language	English