Installation
20
RT-SVX33E-EN
Note:
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).
Main Unit Power
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.
1.
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).
2. Location of the applicable electrical service entrance is
illustrated in the
Unit Dimensions
section. Complete
the 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.
3. Provide proper grounding for the unit in accordance
with local and national codes.
Optional TBUE Wiring (Through the Base
Electrical Option)
1.
Location of the applicable electrical service is
illustrated in the following illustration. 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).
2. Provide proper grounding for the unit in accordance
with local and national codes.
Field Installed Control Wiring
An overall layout of the various control options available
with the required number of conductors for each control
device is illustrated in
Figure 18, p. 22
.
Note:
All field wiring must conform to NEC guidelines as
well as state and local codes.
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.
Controls Using 24 VAC
Before installing any connecting wiring, refer to
“Unit
Dimensions,” p. 11
for the electrical access locations
provided on the unit and
Table 4, p. 21
for AC conductor
sizing guidelines, and;
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.
Figure 16.
Through the base electrical option
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Failure to disconnect power
before servicing could result in death or serious injury.
