Trane INTELLIPAK ™ ™ ™ ™ ™ Commercial Single-Zone Rooftop Air Conditioners with CV or VAV Control - Manual (Page 39)

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Installation (Continued)
Disconnect Switch External Handle
(Factory Mounted Option)
Units ordered with the factory mounted disconnect switch
comes equipped with an externally mounted handle. This
allows the operator to disconnect power from the unit with-
out having to open the control panel door. The handle loca-
tions and its three positions are shown below;
"ON" - Indicates that the disconnect switch is closed,
allowing the main power supply to be applied at the
unit.
"OFF" - Indicates that the disconnect switch is open,
interrupting the main power supply to the unit
controls.
"OPEN COVER/RESET" - Turning the handle to this
position releases the handle from the disconnect
switch, allowing the control panel door to be
opened.
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote discon-
nects before servicing. Follow proper lockout/tagout
procedures to ensure the power can not be inadvert-
ently energized. Failure to disconnect power before ser-
vicing could result in death or serious injury.
Once the door has been opened, it can be closed with the
handle in any one of the three positions outlined above,
provided it matches the disconnect switch position.
The handle can be locked in the "OFF" position. While
holding the handle in the "OFF" position, push the spring
loaded thumb key, attached to the handle, into the base
slot. Place the lock shackle between the handle and the
thumb key. This will prevent it from springing out of posi-
tion.
An overall layout of the field required power wiring is illus-
trated in Figure 3-14. T insure that the unit's supply power
wiring is properly sized and installed, follow the
guildelines outlined below.
Note: All field installed wiring must conform to NEC guide-
lines as well as State and Local codes.
WARNING
Live Electrical Components!
During installation, testing, servicing and troubleshoot-
ing of this product, it may be necessary to work with live
electrical components. Have a qualified licensed electri-
cian or other individual who has been properly trained in
handling live electrical components perform these
tasks. Failure to follow all electrical safety precautions
when exposed to live electrical components could result
in death or serious injury.
Verify that the power supply available is compatible with
the unit's nameplate rating for all components. The avail-
able power supply must be within 10% of the rated voltage
stamped on the nameplate. Use only copper conductors to
connect the 3-phase power supply to the unit.
CAUTION
Use Copper Conductors Only!
Unit terminals are not designed to accept other types of
conductors. Failure to use copper conductors may re-
sult in equipment damage.
Electric Heat Units (SEH_)
SEHF (20 through 75 Ton) electric heat units operating on
200/230 volts require two power supplies as illustrated in
Figure 3-14. Unless the unit was ordered with the optional
factory mounted non-fused disconnect switches, two field-
supplied disconnect switches must be installed. The power
wires for the electric heat is routed into the electric heat
control panel using the thru-the-base access provided in the
heating section. Refer to the appropriate illustration in Fig-
ure 3-2, (Unit Base layout and Electrical Entrance diagram),
for dimensional data.
20 through 75 Ton units operating on 460/575 volts and all
90 through 130 Ton units require one power entry as illus-
trated in Figure 3-14.
Use the information provided in Table 3-7 and the "Power
Wire Sizing & Protection Device Equations", to determine
the appropriate wire size and Maximum Over current Pro-
tection for the heaters/unit.
Note: Each power supply must be protected from
short circuit and ground fault conditions. To
comply with NEC, protection devices must be sized
according to the "Maximum Over current
Protection" (MOP) or "Recommended Dual
Element" (RDE) fuse size data on the unit
nameplate.
Provide grounding for the supply power circuit in the elec-
tric heat control box.
Main Unit Power Wiring
Table 3-6 list the field connection wire ranges for both the
main power terminal block 1TB1 and the optional main
power disconnect switch 1S14. Table 3-7 list the compo-
nent electrical data for 20 through 130 Ton units. The elec-
trical service must be protected from over current and short
circuit conditions in accordance with NEC requirements.
Protection devices must be sized according to the electri-
cal data on the nameplate. Refer to the "Power Wire Sizing
& Protection Device Equations", for determining;
a. the appropriate electrical service wire size based on
"Minimum Circuit Ampacity" (MCA),
b. the "Maximum Over current Protection" (MOP)
device,
c. the "Recommended Dual Element fuse size" (RDE).