Trane IntelliPak SCRF 25, Installation, Operation And Maintenance Manual

Page: 43 / 120

SCXF-SVX01Q-EN 43
Installation - Electrical
Unit Wiring Diagrams
Specific unit wiring diagrams are provided on the
inside of the control panel door. Use these diagrams
for connections or trouble analysis.
Supply Power Wiring
It is the responsibility of the installer to provide power
supply wiring to the unit terminal block or the non-
fused disconnect switch option. Wiring should conform
to NEC and all applicable code requirements.
Bring supply wiring through the knockout in the lower
left side of the unit control panel. Connect the three
phase wires to the power terminal block or the non-
fused disconnect switch in the control box terminals.
Refer to specific wiring diagrams and fuse information
in the control panel.
W WA AR RN NIIN NG G
H Ha azza arrd do ou uss S Se errv viicce e P Prro occe ed du urre ess!!
F Fa aiillu urre e tto o ffo ollllo ow w a allll p prre ecca au uttiio on nss iin n tth hiiss m ma an nu ua all a an nd d
o on n tth he e tta ag gss,, ssttiicckke errss,, a an nd d lla ab be ellss cco ou ulld d rre essu ulltt iin n
d de ea atth h o orr sse erriio ou uss iin njju urry y..
T Te ecch hn niicciia an nss,, iin n o orrd de err tto o p prro otte ecctt tth he em msse ellv ve ess ffrro om m
p po otte en nttiia all e elle eccttrriicca all,, m me ecch ha an niicca all,, a an nd d cch he em miicca all
h ha azza arrd dss,, M MU US ST T ffo ollllo ow w p prre ecca au uttiio on nss iin n tth hiiss m ma an nu ua all
a an nd d o on n tth he e tta ag gss,, ssttiicckke errss,, a an nd d lla ab be ellss,, a ass w we ellll a ass tth he e
ffo ollllo ow wiin ng g iin nssttrru uccttiio on nss:: U Un nlle essss ssp pe ecciiffiie ed d o otth he errw wiisse e,,
d diisscco on nn ne ecctt a allll e elle eccttrriicca all p po ow we err iin nccllu ud diin ng g rre em mo otte e
d diisscco on nn ne ecctt a an nd d d diisscch ha arrg ge e a allll e en ne errg gy y sstto orriin ng g
d de ev viicce ess ssu ucch h a ass cca ap pa acciitto orrss b be effo orre e sse errv viicciin ng g..
F Fo ollllo ow w p prro op pe err llo occkko ou utt//tta ag go ou utt p prro occe ed du urre ess tto o
e en nssu urre e tth he e p po ow we err cca an n n no ott b be e iin na ad dv ve errtte en nttlly y
e en ne errg giizze ed d.. W Wh he en n n ne ecce essssa arry y tto o w wo orrkk w wiitth h lliiv ve e
e elle eccttrriicca all cco om mp po on ne en nttss,, h ha av ve e a a q qu ua alliiffiie ed d lliicce en nsse ed d
e elle eccttrriicciia an n o orr o otth he err iin nd diiv viid du ua all w wh ho o h ha ass b be ee en n
ttrra aiin ne ed d iin n h ha an nd dlliin ng g lliiv ve e e elle eccttrriicca all cco om mp po on ne en nttss
p pe errffo orrm m tth he esse e tta asskkss..
N NO OT TIIC CE E
U Usse e C Co op pp pe err C Co on nd du ucctto orrss O On nlly y!!
F Fa aiillu urre e tto o u usse e cco op pp pe err cco on nd du ucctto orrss cco ou ulld d rre essu ulltt iin n
e eq qu uiip pm me en ntt d da am ma ag ge e a ass tth he e e eq qu uiip pm me en ntt w wa ass n no ott
d de essiig gn ne ed d o orr q qu ua alliiffiie ed d tto o a acccce ep ptt o otth he err tty yp pe ess o off
cco on nd du ucctto orrss..
N NO OT TIIC CE E
M Mo otto orr D Da am ma ag ge e!!
C Co orrrre ecctt p ph ha asse e sse eq qu ue en ncce e iiss ccrriittiicca all.. IIff p ph ha asse e
sse eq qu ue en ncce e o off tth he e iin ncco om miin ng g lliin ne e v vo olltta ag ge e iiss n no ott
cco orrrre ecctt,, iitt cco ou ulld d rre essu ulltt iin n m mo otto orr d da am ma ag ge e..
Voltage Range
Voltages must be within ±10% the nameplate voltage.
Ensure the unit voltage is balanced by measuring at the
compressor terminals. Voltage imbalance on three
phase systems can cause motor overheating and
premature failure. Maximum allowable imbalance is
2.0%.
Voltage Imbalance
Read the voltage at the compressor terminals to
determine if it is balanced. Voltage imbalance on three
phase systems can cause motor overheating and
premature failure. The maximum allowable imbalance
is 2.0%. Voltage imbalance is defined as 100 times the
sum of the deviation of the three voltages from the
average (without regard to sign) divided by the average
voltage. For example, if the three measured voltages
are 221, 230, and 227, the average voltage would be:
(221 + 230 + 227) / 3 = 226 volts
The percentage of voltage imbalance is then:
100 * (226 — 221) / 226 = 2.2%
Phase Monitor
Unit is equipped with phase monitor in control box.
The phase monitor will protect against phase loss,
imbalance and reversal of line voltage. If a fault occurs,
the red LED will energize. While the fault condition is
present, the phase monitor interrupts the 115V control
circuit. If no faults are observed, a green LED will be
energized.
Control Power
N NO OT TIIC CE E
C Co om mp po on ne en ntt 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
iim mm me ed diia atte e o orr p prre em ma attu urre e cco om mp po on ne en ntt ffa aiillu urre ess..
U Un niitt ttrra an nssffo orrm me errss a arre e ssiizze ed d tto o p prro ov viid de e p po ow we err tto o
tth he e u un niitt o on nlly y.. D Do o n no ott u usse e tth he esse e ttrra an nssffo orrm me errss tto o
ssu up pp plly y p po ow we err tto o ffiie elld d e eq qu uiip pm me en ntt..
In this example, 2.2% imbalance is not acceptable.
Whenever a voltage imbalance of more than 2.0%
exists, check the voltage at the unit disconnect switch.
If the imbalance at the unit disconnect switch does not
exceed 2.0%, faulty unit wiring is causing the
imbalance. Conduct a thorough inspection of the unit
electrical wiring connections to locate the fault, and
make any repairs necessary.
Access the connection terminal block through the
control panel on the upper left side of the unit. All
wiring should conform to NEC and applicable local
code requirements.
Be sure all wiring connections are secure. Reference
the unit specific diagrams inside the control panel.