32
RT-SVX34R-EN
• MOP = (2.25 x Load 1) + Load 2 + Load 3 + Load 4
NNoottee:: The MOP value stamped on the nameplate is
the largest of the two calculated values.
• RDE = (1.5 x Load 1) + Load 2 + Load 3 + Load 4
NNoottee:: Select an over current protection device equal to
the MOP value. If the calculated MOP value does
not equal a standard size protection device listed
in NEC 240-6, select the next lower over current
protection device. If the calculated MOP value is
less than the MCA value, select the lowest over
current protection device which is equal to or
larger than the MCA, providing the selected over
current device does not exceed 800 amps.
NNoottee:: Select a Dual Element Fuse equal to the RDE
value. If the calculated RDE value does not equal
a standard dual element fuse size listed in NEC
240-6, select the next higher fuse size. If the
calculated RDE value is greater than the MOP
value, select a Dual Element fuse equal to the
calculated MOP (Maximum Over current
Protection) value.
Disconnect Switch Sizing (DSS)
• Calculation A — YC*, TC*, and TE* units:
– DSS = 1.15 X (LOAD1 + LOAD2 + LOAD4)
NNoottee:: For TE* units, use calculations A and B.
• Calculation B — TE* units:
– DSS = 1.15 X (LOAD3 + Supply Fan FLA +
Exhaust Fan FLA).
NNoottee:: Use the larger value of calculations A or B to size
the electrical disconnect switch.
Low Voltage Wiring
An overall layout of the various control options
available for a Constant Volume application is
illustrated in , p. 33. Figure 22, p. 35 illustrates the
various control options for a Variable Air Volume
application. The required number of conductors for
each control device are listed in the illustration.
A typical field connection diagram for the sensors and
other options are shown in the following section
“Remote Panels and Sensors”. These diagrams are
representative of standard applications and are
provided for general reference only. Always refer to the
wiring diagram that shipped with the unit for specific
electrical schematic and connection information.
NNoottee:: All field wiring must conform to NEC guidelines
as well as state and local codes.
Control Power Transformer
WWAARRNNIINNGG
HHaazzaarrddoouuss VVoollttaaggee!!
FFaaiilluurree ttoo ddiissccoonnnneecctt ppoowweerr bbeeffoorree sseerrvviicciinngg ccoouulldd
rreessuulltt iinn ddeeaatthh oorr sseerriioouuss iinnjjuurryy..
DDiissccoonnnneecctt aallll eelleeccttrriicc ppoowweerr,, iinncclluuddiinngg rreemmoottee
ddiissccoonnnneeccttss bbeeffoorree sseerrvviicciinngg.. FFoollllooww pprrooppeerr
lloocckkoouutt//ttaaggoouutt pprroocceedduurreess ttoo eennssuurree tthhee ppoowweerr
ccaann nnoott bbee iinnaaddvveerrtteennttllyy eenneerrggiizzeedd.. VVeerriiffyy tthhaatt nnoo
ppoowweerr iiss pprreesseenntt wwiitthh aa vvoollttmmeetteerr..
The 24 volt control power transformers are equipped
with internal circuit breakers. They are to be used only
with the accessories called out in this manual. If a
circuit breaker trips, be sure to turn off all power to the
unit before attempting to reset it.
On units equipped with the VFD option, an additional
control power transformer is used. The secondary is
protected with fuses. Should the fuse blow, be sure to
turn off all power to the unit before attempting to
replace it.
Field Installed AC Control Wiring
WWAARRNNIINNGG
HHaazzaarrddoouuss VVoollttaaggee!!
FFaaiilluurree ttoo ddiissccoonnnneecctt ppoowweerr bbeeffoorree sseerrvviicciinngg ccoouulldd
rreessuulltt iinn ddeeaatthh oorr sseerriioouuss iinnjjuurryy..
DDiissccoonnnneecctt aallll eelleeccttrriicc ppoowweerr,, iinncclluuddiinngg rreemmoottee
ddiissccoonnnneeccttss bbeeffoorree sseerrvviicciinngg.. FFoollllooww pprrooppeerr
lloocckkoouutt//ttaaggoouutt pprroocceedduurreess ttoo eennssuurree tthhee ppoowweerr
ccaann nnoott bbee iinnaaddvveerrtteennttllyy eenneerrggiizzeedd.. VVeerriiffyy tthhaatt nnoo
ppoowweerr iiss pprreesseenntt wwiitthh aa vvoollttmmeetteerr..
WWAARRNNIINNGG
PPrrooppeerr FFiieelldd WWiirriinngg aanndd GGrroouunnddiinngg
RReeqquuiirreedd!!
FFaaiilluurree ttoo ffoollllooww ccooddee ccoouulldd rreessuulltt iinn ddeeaatthh oorr
sseerriioouuss iinnjjuurryy..
AAllll ffiieelldd wwiirriinngg MMUUSSTT bbee ppeerrffoorrmmeedd bbyy qquuaalliiffiieedd
ppeerrssoonnnneell.. IImmpprrooppeerrllyy iinnssttaalllleedd aanndd ggrroouunnddeedd
ffiieelldd wwiirriinngg ppoosseess FFIIRREE aanndd EELLEECCTTRROOCCUUTTIIOONN
hhaazzaarrddss.. TToo aavvooiidd tthheessee hhaazzaarrddss,, yyoouu MMUUSSTT ffoollllooww
rreeqquuiirreemmeennttss ffoorr ffiieelldd wwiirriinngg iinnssttaallllaattiioonn aanndd
ggrroouunnddiinngg aass ddeessccrriibbeedd iinn NNEECC aanndd yyoouurr llooccaall//
ssttaattee//nnaattiioonnaall eelleeccttrriiccaall ccooddeess..
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..
IInnssttaallllaattiioonn EElleeccttrriiccaall
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