Trane Voyager Commercial, Installation, Operation And Maintenance Manual

Page: 32 / 156

32 RT-SVX34R-EN
• MOP = (2.25 x Load 1) + Load 2 + Load 3 + Load 4
N No otte e:: 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
N No otte e:: 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.
N No otte e:: 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)
N No otte e:: For TE* units, use calculations A and B.
• Calculation B — TE* units:
– DSS = 1.15 X (LOAD3 + Supply Fan FLA +
Exhaust Fan FLA).
N No otte e:: 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.
N No otte e:: All field wiring must conform to NEC guidelines
as well as state and local codes.
Control Power Transformer
W WA AR RN NIIN NG G
H Ha azza arrd do ou uss V Vo olltta ag ge e!!
F Fa aiillu urre e tto o d diisscco on nn ne ecctt p po ow we err b be effo orre e sse errv viicciin ng g cco ou ulld d
rre essu ulltt iin n d de ea atth h o orr sse erriio ou uss iin njju urry y..
D Diisscco on nn ne ecctt a allll e elle eccttrriicc p po ow we err,, iin nccllu ud diin ng g rre em mo otte e
d diisscco on nn ne eccttss 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.. V Ve erriiffy y tth ha att n no o
p po ow we err iiss p prre esse en ntt w wiitth h a a v vo ollttm me ette err..
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
W WA AR RN NIIN NG G
H Ha azza arrd do ou uss V Vo olltta ag ge e!!
F Fa aiillu urre e tto o d diisscco on nn ne ecctt p po ow we err b be effo orre e sse errv viicciin ng g cco ou ulld d
rre essu ulltt iin n d de ea atth h o orr sse erriio ou uss iin njju urry y..
D Diisscco on nn ne ecctt a allll e elle eccttrriicc p po ow we err,, iin nccllu ud diin ng g rre em mo otte e
d diisscco on nn ne eccttss 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.. V Ve erriiffy y tth ha att n no o
p po ow we err iiss p prre esse en ntt w wiitth h a a v vo ollttm me ette err..
W WA AR RN NIIN NG G
P Prro op pe err F Fiie elld d W Wiirriin ng g a an nd d G Grro ou un nd diin ng g
R Re eq qu uiirre ed d!!
F Fa aiillu urre e tto o ffo ollllo ow w cco od de e cco ou ulld d rre essu ulltt iin n d de ea atth h o orr
sse erriio ou uss iin njju urry y..
A Allll ffiie elld d w wiirriin ng g M MU US ST T b be e p pe errffo orrm me ed d b by y q qu ua alliiffiie ed d
p pe errsso on nn ne ell.. IIm mp prro op pe errlly y iin nsstta alllle ed d a an nd d g grro ou un nd de ed d
ffiie elld d w wiirriin ng g p po osse ess F FIIR RE E a an nd d E EL LE EC CT TR RO OC CU UT TIIO ON N
h ha azza arrd dss.. T To o a av vo oiid d tth he esse e h ha azza arrd dss,, y yo ou u M MU US ST T ffo ollllo ow w
rre eq qu uiirre em me en nttss ffo orr ffiie elld d w wiirriin ng g iin nsstta alllla attiio on n a an nd d
g grro ou un nd diin ng g a ass d de essccrriib be ed d iin n N NE EC C a an nd d y yo ou urr llo occa all//
sstta atte e//n na attiio on na all e elle eccttrriicca all cco od de ess..
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..
IIn nsstta alllla attiio on n E Elle eccttrriicca all