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.
WWAARRNNIINNGG
HHaazzaarrddoouuss SSeerrvviiccee PPrroocceedduurreess!!
FFaaiilluurree ttoo ffoollllooww aallll pprreeccaauuttiioonnss iinn tthhiiss mmaannuuaall aanndd
oonn tthhee ttaaggss,, ssttiicckkeerrss,, aanndd llaabbeellss ccoouulldd rreessuulltt iinn
ddeeaatthh oorr sseerriioouuss iinnjjuurryy..
TTeecchhnniicciiaannss,, iinn oorrddeerr ttoo pprrootteecctt tthheemmsseellvveess ffrroomm
ppootteennttiiaall eelleeccttrriiccaall,, mmeecchhaanniiccaall,, aanndd cchheemmiiccaall
hhaazzaarrddss,, MMUUSSTT ffoollllooww pprreeccaauuttiioonnss iinn tthhiiss mmaannuuaall
aanndd oonn tthhee ttaaggss,, ssttiicckkeerrss,, aanndd llaabbeellss,, aass wweellll aass tthhee
ffoolllloowwiinngg iinnssttrruuccttiioonnss:: UUnnlleessss ssppeecciiffiieedd ootthheerrwwiissee,,
ddiissccoonnnneecctt aallll eelleeccttrriiccaall ppoowweerr iinncclluuddiinngg rreemmoottee
ddiissccoonnnneecctt aanndd ddiisscchhaarrggee aallll eenneerrggyy ssttoorriinngg
ddeevviicceess ssuucchh aass ccaappaacciittoorrss bbeeffoorree sseerrvviicciinngg..
FFoollllooww pprrooppeerr lloocckkoouutt//ttaaggoouutt pprroocceedduurreess ttoo
eennssuurree tthhee ppoowweerr ccaann nnoott bbee iinnaaddvveerrtteennttllyy
eenneerrggiizzeedd.. WWhheenn nneecceessssaarryy ttoo wwoorrkk wwiitthh lliivvee
eelleeccttrriiccaall ccoommppoonneennttss,, hhaavvee aa qquuaalliiffiieedd lliicceennsseedd
eelleeccttrriicciiaann oorr ootthheerr iinnddiivviidduuaall wwhhoo hhaass bbeeeenn
ttrraaiinneedd iinn hhaannddlliinngg lliivvee eelleeccttrriiccaall ccoommppoonneennttss
ppeerrffoorrmm tthheessee ttaasskkss..
NNOOTTIICCEE
UUssee CCooppppeerr CCoonndduuccttoorrss OOnnllyy!!
FFaaiilluurree ttoo uussee ccooppppeerr ccoonndduuccttoorrss ccoouulldd rreessuulltt iinn
eeqquuiippmmeenntt ddaammaaggee aass tthhee eeqquuiippmmeenntt wwaass nnoott
ddeessiiggnneedd oorr qquuaalliiffiieedd ttoo aacccceepptt ootthheerr ttyyppeess ooff
ccoonndduuccttoorrss..
NNOOTTIICCEE
MMoottoorr DDaammaaggee!!
CCoorrrreecctt pphhaassee sseeqquueennccee iiss ccrriittiiccaall.. IIff pphhaassee
sseeqquueennccee ooff tthhee iinnccoommiinngg lliinnee vvoollttaaggee iiss nnoott
ccoorrrreecctt,, iitt ccoouulldd rreessuulltt iinn mmoottoorr ddaammaaggee..
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
NNOOTTIICCEE
CCoommppoonneenntt DDaammaaggee!!
FFaaiilluurree ttoo ffoollllooww iinnssttrruuccttiioonnss bbeellooww ccoouulldd rreessuulltt iinn
iimmmmeeddiiaattee oorr pprreemmaattuurree ccoommppoonneenntt ffaaiilluurreess..
UUnniitt ttrraannssffoorrmmeerrss aarree ssiizzeedd ttoo pprroovviiddee ppoowweerr ttoo
tthhee uunniitt oonnllyy.. DDoo nnoott uussee tthheessee ttrraannssffoorrmmeerrss ttoo
ssuuppppllyy ppoowweerr ttoo ffiieelldd eeqquuiippmmeenntt..
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.
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