Installation
16 RT-SVX055D-EN
• If the unit is not equipped with an optional factory
installed nonfused disconnect switch, 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 ser
vice entrance is
illustrated in “Dimensional Data,” p. 8. 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
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.
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
b
reaker 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
“Dimensional Data,” p. 8 for the electrical access locations
provided on the unit and Table 2, p. 16 for AC conductor
sizing guid
elines.
NOTICE
Use Copper Conductors Only!
Unit terminals are not designed to accept other types of
conductors. Failure to use copper conductors could
result in equipment damage.
1. Use copper conductors unless otherwise
specified.
2. Ensure that the AC control wiring between the controls
and the unit’s term
ination point does not exceed three
(3) ohms/conductor for the length of the run.
Note: Resis
tance in excess of 3 oh
ms per conductor
could cause component failure due to insufficient
AC voltage supply.
3. Be sure to check all loads an
d condu
ctors 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.
5. Route low voltage wiring per illustrations on the
next
page.
Tabl
e 2. Electromechanical thermost
at 24 Vac
conductors
Distance from Unit to
Control Recommended Wire Size
000–460 feet 18 gauge
000–140 m 0.75 mm
2
461–732 feet 16 gauge
Figure 12. Conventional thermostat field wiring
diagram
Table 2. Electromechanical thermostat 24 Vac
conductors
To Next Page
Loading...
