Installation
76
RT-SVX24J-EN
Disconnect Switch w/External Handle
Units come equipped with a factory mounted disconnect
switch with an externally mounted handle.This allows the
operator to disconnect power from the unit without having
to open the control panel door. The handle locations 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.
“RESET” - Turning the handle to this position resets
the circuit breaker (if so equipped).
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
position.
An overall layout of the field required power wiring is
illustrated beginning with
Figure 54, p. 77
.To ensure that
the unit supply power wiring is properly sized and
installed, follow these guidelines.
Note:
All field installed wiring must conform to NEC
guidelines as well as State and Local codes.
Verify that the power supply available is compatible with
the unit nameplate rating for all components. The
available 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.
Electric Heat Units
Electric Heat Units require one power entry as illustrated
in
Figure 54, p. 77
. Use the information provided in
Table 24, p. 80
and the “Power Wire Sizing & Protection
Device Equations”, to determine the appropriate wire size
and Maximum Over current Protection 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
electric heat control box.
WARNING
Hazardous Voltage w/Capacitors!
Disconnect all electric power, including remote
disconnects and discharge all motor start/run
capacitors before servicing. Follow proper lockout/
tagout procedures to ensure the power cannot be
inadvertently energized. Verify with an appropriate
voltmeter that all capacitors have discharged. Failure to
disconnect power and discharge capacitors before
servicing could result in death or serious injury.
For additional information regarding the safe discharge
of capacitors, see PROD-SVB06A-EN
Figure 53. Disconnect switch external handle
WARNING
Live Electrical Components!
During installation, testing, servicing and
troubleshooting of this product, it may be necessary to
work with live electrical components. Have a qualified
licensed electrician 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.
CAUTION
Use Copper Conductors Only!
Unit terminals are not designed to accept other types
of conductors. Failure to use copper conductors may
result in equipment damage.
Содержание SEHJ090-162
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