Installation
RT-SVX39B-EN
23
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 VA 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
for the electrical access locations
provided on the unit and
for AC conductor
sizing guidelines, and;
a. Use copper conductors unless otherwise specified.
b. 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.
c. Be sure to check all loads and conductors for
grounds, shorts, and mis-wiring.
d. Do not run the AC low voltage wiring in the same
conduit with the high voltage power wiring.
e. Route low voltage wiring per
Controls using DC Analog Input/Outputs
(Standard Low Voltage
Multiconductor Wire)
Before installing any connecting wiring between the unit
and components utilizing a DC analog input\output signal,
refer to
for the electrical access
locations provided on the unit.
1.
lists the conductor sizing guidelines that must
be followed when interconnecting the DC binary
output devices and the system components utilizing a
DC analog input\output signal to the unit.
Note:
Resistance in excess of 2.5 ohms per conductor can
cause deviations in the accuracy of the controls.
2. Ensure that the wiring between controls and the unit’s
termination point does not exceed two and a half (2.5)
ohms/conductor for the length of the run.
3. Do not run the electrical wires transporting DC signals
in or around conduit housing high voltage wires.
4. Route low voltage wiring per
.
NOTICE:
Use Copper Conductors Only!
Resistance in excess of 3 ohms per conductor may
cause component failure due to insufficient AC voltage
supply.
Table 3.
AC conductors
Distance from Unit to Control Recommended Wire Size
000 - 460 feet
000 - 140 m
18 gauge
.75 mm
2
461 - 732 feet
141 - 223 m
16 gauge
1.3 mm
2
733 - 1000 feet
224 - 305 m
14 gauge
2.0 mm
2
Table 4.
DC conductors
Distance from Unit
to Control
Recommended
Wire Size
0 - 150 feet
0 - 45.7 m
22 gauge
.33 mm
2
151 - 240 feet
46 - 73.1 m
20 gauge
.50 mm
2
241 -385 feet
73.5 - 117.3 m
18 gauge
.75 mm
2
386 - 610 feet
117.7 - 185.9 m
16 gauge
1.3 mm
2
611 - 970 feet
186.2 - 295.7 m
14 gauge
2.0 mm
2
Figure 23.
ReliaTel conventional thermostat field wiring
diagram
RTRM
