Electric Heat Units (Seh_) - Trane IntelliPak 1 with Symbio 800 Installation, Operation And Maintenance Manual

thumb key, locks the handle so the unit cannot be
energized. Turning the handle to this position also
releases the handle from the disconnect switch,
allowing the control panel door to be opened.
WARNING
Hazardous Voltage w/Capacitors!
Failure to disconnect power and discharge capacitors
before servicing could result in death or serious
injury.
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. For variable frequency drives
or other energy storing components provided by
Trane or others, refer to the appropriate
manufacturer's literature for allowable waiting periods
for discharge of capacitors. Verify with a CAT III or IV
voltmeter rated per NFPA 70E that all capacitors have
discharged.
The handle can be locked in the "OFF" position by
completing the following steps (see
1. While holding the handle in the "OFF" position, push
the spring loaded thumb key, attached to the handle,
into the base slot.
2. Place the lock shackle between the handle and the
thumb key. This will prevent it from springing out of
position.
Figure 33. Disconnect switch external handle
Locking
Locking
Thumb
Slot
Key Under
Handle
Note: All field installed wiring must conform to NEC
guidelines as well as State and Local codes.
An overall layout of the field required power wiring is
illustrated in . To ensure that the unit supply power wiring is
properly sized and installed, follow these guidelines:
RT-SVX072D-EN
Figure 33, p. 49):
WARNING
Live Electrical Components!
Failure to follow all electrical safety precautions when
exposed to live electrical components could result in
death or serious injury.
When it is 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.
NOTICE
Use Copper Conductors Only!
Failure to use copper conductors could result in
equipment damage as the equipment was not
designed or qualified to accept other types of
conductors.
WARNING
Hot Surface!
Failure to follow instructions below could result in
severe burns.
Do not touch the heat exchanger board with bare
hands while disassembling the pan. Allow to cool and
put on proper Personal Protective Equipment (PPE)
before servicing.
• 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 (SEH_)

SEH_ (20-75 ton) electric heat units operating on 200/230
volts require two power supplies as illustrated in . Unless
the unit was ordered with the optional factory mounted,
non-fused disconnect switches, two field-supplied
disconnect switches must be installed per NEC
requirements. The power wires for the electric heat are
routed into the electric heat control panel using the
through-the-base access provided in the heating section.
Refer to the appropriate illustration in , (unit base layout
and electrical entrance diagram), for dimensional data. For
20-130 ton units operating on 460/575 volts, only one field
installed disconnect switch is required, as illustrated in and
.
Use the information provided in Service Sizing data and the
"Power Wire Sizing & Protection Device Equations," to
determine the appropriate wire size and Maximum Over
current Protection for the heaters/unit.
Installation
49