56
SS-SVX11K-EN
Figure 39. EVP chiller, typical refrigerant piping
(2 circuit system)
Gauge Ports &
Superheat
Adjustment Port
#1 Suction Line
#2 Suction Line
Charging Ports
Expansion Valve
Moisture Indicator
Solenoid Valve
(Migration only)
Refrigerant “Shut Off” Valve
#2 Liquid Line
#1 Liquid Line
Remote EVP Chiller
Water Treatment
NNOOTTIICCEE
PPrrooppeerr WWaatteerr TTrreeaattmmeenntt RReeqquuiirreedd!!
TThhee uussee ooff uunnttrreeaatteedd oorr iimmpprrooppeerrllyy ttrreeaatteedd wwaatteerr
ccoouulldd rreessuulltt iinn ssccaalliinngg,, eerroossiioonn,, ccoorrrroossiioonn,, aallggaaee oorr
sslliimmee..
UUssee tthhee sseerrvviicceess ooff aa qquuaalliiffiieedd wwaatteerr ttrreeaattmmeenntt
ssppeecciiaalliisstt ttoo ddeetteerrmmiinnee wwhhaatt wwaatteerr ttrreeaattmmeenntt,, iiff
aannyy,, iiss rreeqquuiirreedd.. TTrraannee aassssuummeess nnoo rreessppoonnssiibbiilliittyy
ffoorr eeqquuiippmmeenntt ffaaiilluurreess wwhhiicchh rreessuulltt ffrroomm uunnttrreeaatteedd
oorr iimmpprrooppeerrllyy ttrreeaatteedd wwaatteerr,, oorr ssaalliinnee oorr bbrraacckkiisshh
wwaatteerr..
The use of untreated or improperly treated water could
result in scaling, erosion, corrosion, and algae or slime
buildup in the heat exchanger. This will adversely
affect system capacity. Proper water treatment must be
determined locally and depends on the type of system
and local water characteristics. Neither salt nor
brackish water is recommend, use of either will lead to
a shortened heat exchanger life. Trane encourages
employment of a qualified water treatment specialist,
familiar with local water conditions, to assist in the
establishment of a proper water treatment program.
Water Flow Limits
NNOOTTIICCEE
HHeeaatt EExxcchhaannggeerr aanndd CCoommpprreessssoorr
DDaammaaggee!!
WWaatteerr ffllooww rraatteess bbeeyyoonndd tthhee hheeaatt eexxcchhaannggeerr lliimmiittss
ccoouulldd rreessuulltt iinn ppeerrmmaanneenntt ddaammaaggee ttoo tthhee hheeaatt
eexxcchhaannggeerr aanndd//oorr ccoommpprreessssoorr..
DDoo nnoott ooppeerraattee oouuttssiiddee rreeccoommmmeennddeedd ffllooww rraatteess..
The minimum and maximum water flow rates are
given in the General Data section. Water flow rates
below the tabulated values will result in laminar flow
causing freeze-up problems, scaling, stratification and
poor system control. Flow rates exceeding the
maximum listed could result in very high pressure
drop, erosion of the heat exchanger and damage to the
water flow switch.
Water Temperature Limits
NNOOTTIICCEE
HHeeaatt EExxcchhaannggeerr aanndd CCoommpprreessssoorr
DDaammaaggee!!
FFaaiilluurree ttoo ffoollllooww iinnssttrruuccttiioonnss bbeellooww ccoouulldd rreessuulltt iinn
hheeaatt eexxcchhaannggeerr aanndd ccoommpprreessssoorr ddaammaaggee ffrroomm
wwaatteerr ffrreeeezziinngg iinn bbrraazzeedd ppllaattee aanndd rruuppttuurriinngg
sseeppaarraattiioonn bbeettwweeeenn rreeffrriiggeerraanntt aanndd wwaatteerr ffllooww
cchhaannnneellss..
LLeeaavviinngg wwaatteerr tteemmppeerraattuurreess bbeellooww 4422°°FF rreeqquuiirree
ggllyyccooll pprrootteeccttiioonn ddoowwnn ttoo 1155°°FF..
NNOOTTIICCEE
EEvvaappoorraattoorr DDaammaaggee!!
CCiirrccuullaattiinngg wwaatteerr tteemmppeerraattuurreess aabboovvee 112255°°FF wwhheenn
tthhee uunniitt iiss nnoott ooppeerraattiinngg ccoouulldd rreessuulltt iinn eevvaappoorraattoorr
ddaammaaggee..
Catalog chiller performance data is based on a water
temperature drop of 10°F . Full load chilled water
temperature drops from 8 to 14°F may be used as long
as minimum and maximum water temperature and
minimum and maximum flow rates are not violated.
Leaving water temperatures below 42°F require freeze
protection down to 15°F. The maximum water
temperature that can be circulated through the chiller
when the unit is not operating is 125°F. Evaporator
damage could result above this temperature.
Short Water Loops
NNOOTTIICCEE
CCoommpprreessssoorr DDaammaaggee!!
DDoo nnoott ooppeerraattee wwiitthh wwaatteerr llooooppss wwiitthh lleessss tthhaann ffiivvee
mmiinnuutteess cciirrccuullaattiioonn ttiimmee aass iitt ccoouulldd rreessuulltt iinn ppoooorr
ssuuppeerrhheeaatt ccoonnttrrooll aanndd ccoommpprreessssoorr ddaammaaggee..
Adequate chilled water system water volume is an
important system design parameter because it
provides for stable chilled water temperature control
and helps limit unacceptable short cycling of chiller
compressors. Typically, a five-minute water loop
circulation time is sufficient to prevent short water loop
issues. Therefore, as a guideline, ensure the volume of
water in the chilled water loop equals or exceeds five
times the evaporator flow rate. For systems with a
rapidly changing load profile the amount of volume
should be increased.
IInnssttaallllaattiioonn MMeecchhaanniiccaall —— EEVVPP
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