Trane RAUJ-C20, Installation, Operation And Maintenance Manual

Page: 56 / 132

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
N NO OT TIIC CE E
P Prro op pe err W Wa atte err T Trre ea attm me en ntt R Re eq qu uiirre ed d!!
T Th he e u usse e o off u un nttrre ea atte ed d o orr iim mp prro op pe errlly y ttrre ea atte ed d w wa atte err
cco ou ulld d rre essu ulltt iin n sscca alliin ng g,, e erro ossiio on n,, cco orrrro ossiio on n,, a allg ga ae e o orr
sslliim me e..
U Usse e tth he e sse errv viicce ess o off a a q qu ua alliiffiie ed d w wa atte err ttrre ea attm me en ntt
ssp pe ecciia alliisstt tto o d de ette errm miin ne e w wh ha att w wa atte err ttrre ea attm me en ntt,, iiff
a an ny y,, iiss rre eq qu uiirre ed d.. T Trra an ne e a assssu um me ess n no o rre essp po on nssiib biilliitty y
ffo orr e eq qu uiip pm me en ntt ffa aiillu urre ess w wh hiicch h rre essu ulltt ffrro om m u un nttrre ea atte ed d
o orr iim mp prro op pe errlly y ttrre ea atte ed d w wa atte err,, o orr ssa alliin ne e o orr b brra acckkiissh h
w wa atte err..
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
N NO OT TIIC CE E
H He ea att E Ex xcch ha an ng ge err a an nd d C Co om mp prre esssso orr
D Da am ma ag ge e!!
W Wa atte err ffllo ow w rra atte ess b be ey yo on nd d tth he e h he ea att e ex xcch ha an ng ge err lliim miittss
cco ou ulld d rre essu ulltt iin n p pe errm ma an ne en ntt d da am ma ag ge e tto o tth he e h he ea att
e ex xcch ha an ng ge err a an nd d//o orr cco om mp prre esssso orr..
D Do o n no ott o op pe erra atte e o ou uttssiid de e rre ecco om mm me en nd de ed d ffllo ow w rra atte ess..
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
N NO OT TIIC CE E
H He ea att E Ex xcch ha an ng ge err a an nd d C Co om mp prre esssso orr
D Da am ma ag ge e!!
F Fa aiillu urre e tto o ffo ollllo ow w iin nssttrru uccttiio on nss b be ello ow w cco ou ulld d rre essu ulltt iin n
h he ea att e ex xcch ha an ng ge err a an nd d cco om mp prre esssso orr d da am ma ag ge e ffrro om m
w wa atte err ffrre ee ezziin ng g iin n b brra azze ed d p plla atte e a an nd d rru up pttu urriin ng g
sse ep pa arra attiio on n b be ettw we ee en n rre effrriig ge erra an ntt a an nd d w wa atte err ffllo ow w
cch ha an nn ne ellss..
L Le ea av viin ng g w wa atte err tte em mp pe erra attu urre ess b be ello ow w 4 42 2°°F F rre eq qu uiirre e
g glly ycco oll p prro otte eccttiio on n d do ow wn n tto o 1 15 5°°F F..
N NO OT TIIC CE E
E Ev va ap po orra atto orr D Da am ma ag ge e!!
C Ciirrccu ulla attiin ng g w wa atte err tte em mp pe erra attu urre ess a ab bo ov ve e 1 12 25 5°°F F w wh he en n
tth he e u un niitt iiss n no ott o op pe erra attiin ng g cco ou ulld d rre essu ulltt iin n e ev va ap po orra atto orr
d da am ma ag ge e..
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
N NO OT TIIC CE E
C Co om mp prre esssso orr D Da am ma ag ge e!!
D Do o n no ott o op pe erra atte e w wiitth h w wa atte err llo oo op pss w wiitth h lle essss tth ha an n ffiiv ve e
m miin nu utte ess cciirrccu ulla attiio on n ttiim me e a ass iitt cco ou ulld d rre essu ulltt iin n p po oo orr
ssu up pe errh he ea att cco on nttrro oll a an nd d cco om mp prre esssso orr d da am ma ag ge e..
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.
IIn nsstta alllla attiio on n M Me ecch ha an niicca all — — E EV VP P