26
RT-SVX096A-EN
Field Installed Power Wiring
An overall dimensional layout for the standard field
installed wiring entrance into the unit is illustrated in
“Dimensional Data,” p. 11. To insure the unit’s supply
power wiring is properly sized and installed, follow the
guidelines outlined below.
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’s nameplate ratings. The available supply power
must be within 10 percent of the rated voltage stamped on
the nameplate. Use only copper conductors to connect the
power supply to the unit.
WARNING
Electrical Shock Hazard!
Failure to follow instructions below could result in
death or serious injury.
Always turn off all power to the unit before installing
or servicing the unit. There may be more than one
disconnect switch. Turn off accessory heater power if
applicable. Lock out and tag switch with a suitable
warning label.
Important: 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
WARNING
Proper Field Wiring and Grounding
Required!
Failure to follow code could result in death or serious
injury.
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/national
electrical codes.
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.
• 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 “Dimensional Data,” p. 11. Complete the
unit’s power wiring connections onto either the main
terminal block inside the unit control panel 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.
Control Power Transformer
The 24-volt control power transformers are to be used only
with the accessories called out in this manual.
Controls using 24 Vac
Before installing any connecting wiring, refer to
“Dimensional Data,” p. 11 for the electrical access
locations provided on the unit and Table 4, p. 26 for AC
conductor sizing guidelines.
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.
1. Use copper conductors unless otherwise specified.
2. Ensure that the AC control wiring between the controls
and the unit’s termination point does not exceed three
(3) ohms/conductor for the length of the run.
Note: Resistance in excess of 3 ohms per conductor
could cause component failure due to
insufficient AC voltage supply.
3. Be sure to check all loads and conductors for grounds,
shorts, and mis-wiring.
4. Do not run the AC low voltage wiring in the same
conduit with the high voltage power wiring.
Table 4. Electromechanical thermostat 24V AC conductors with electromechanical unit
Distance from Unit to Control Recommended Wire Size
0 - 30 feet
22 gauge
0 - 9.1 m 0.33 mm^2
Installation
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