Main Unit Power - Trane TH 150-300 Series Installation, Operation And Maintenance Manual

Main Unit Power

WARNING
Proper Field Wiring and Grounding
Required!
All field wiring MUST be performed by qualified
personnel. Improperly installed and grounded field
wiring poses FIRE and ELECTROCUTION hazards. To
avoid these hazards, you MUST follow requirements for
field wiring installation and grounding as described in
NEC and your local/state electrical codes. Failure to
follow code could result in death or serious injury.
Standard Wiring
The electrical service must be protected from over current
and short circuit conditions in accordance with NEC
requirements.
Protection devices must be sized according to the
electrical data on the nameplate.
• If the unit is not equipped with an optional factory
installed nonfused disconnect switch or circuit breaker,
a field supplied disconnect switch must be installed at
or near the unit in accordance with the National
Electrical Code (NEC latest edition).
• Location of the applicable electrical service entrance is
illustrated in "Unit Dimensions, " p.
unit's power wiring connections onto either; the main
terminal block HTB1 inside the unit control panel, the
factory mounted nonfused disconnect switch (UCD) or
circuit breaker (UCB), or the electric heat terminal
block. Refer to the customer connection diagram that
shipped with the unit for specific termination points.
• Provide proper grounding for the unit in accordance
with local and national codes.
Optional TBUE Wiring (Through the Base
Electrical Option)
• Location of the applicable electrical service is
illustrated below. Refer to the customer connection
diagram that is shipped with the unit for specific
termination points. The termination points, depending
on the customer option selected would be a factory
mounted nonfused disconnect switch (UDC) or circuit
breaker (UCB).
• Provide proper grounding for the unit in accordance
with local and national codes.
RT-SVX25J-EN
Figure 13. Through the base electrical option
Field Installed Control Wiring
An overall layout of the various control options available
with the required number of conductors for each control
12. Complete the
device is illustrated in
Note: All field wiring must conform to NEC guidelines as
Control Power Transformer
The 24-volt control power transformers are to be used only
with the accessories called out in this manual.
Transformers rated greater than 50 Vac are equipped with
internal circuit breakers. If a circuit breaker trips, turn "Off"
all power to the unit before attempting to reset it.
The transformer is located in the control panel. The circuit
breaker is located on the left side of the transformer and
can be reset by pressing in on the black reset button.
Figure 18, p.
well as state and local codes.
Installation
24.
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