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Table 30. Electrical service sizing data—convenience
outlet transformer
460
Nominal Tons
FLA (add) FLA (add)
90-162
3.3
Table 31. Compressor data
Number
of
Compress
Unit Size
ors
2
90/100 Ton Std &
Hi-Capacity
2
2
105/118 Ton Std &
Hi-Capacity
2
2
120/128 Ton Std &
Hi-Capacity
2
2
130/140 Ton Std &
Hi-Capacity
2
2
150/162 Ton Std
2
Field Installed Control Wiring
The Rooftop Module (RTM) must have a mode input in
order to operate the rooftop unit.The flexibility of having
several system modes depends upon the type of sensor
and/or remote panel selected to interface with the RTM. An
overall layout of the various control options available, with
the required number of conductors for each device, is
illustrated beginning with
Note: All field wiring must conform to NEC guidelines as
well as state and local codes.
The various field installed control panels, sensors,
switches, and contacts discussed in this section require
both AC and DC consideration.These diagrams are
representative of standard applications and are provided
for general reference only. Always refer to the wiring
diagram that shipped with the unit for specific electrical
schematic and connection information.
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.
Controls using 24 VAC
Before installing any connecting wiring, refer to
p. 21
for the electrical access locations provided on the
RT-SVX24J-EN
Voltage
575
2.6
Compress
or
Compress
Designat
Compress
or Size
or
or Type
CSHN250
1A, 2A
CSHN250
1B, 2B
CSHN250
1A, 2A
CSHN315
1B, 2B
CSHN315
1A, 2A
CSHN315
1B, 2B
CSHN315
1A, 2A
CSHN374
1B, 2B
CSHN374
1A, 2A
CSHN374
1B, 2B
Figure 57, p.
87.
Figure 10,
unit and
Table 32, p. 81
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.
Note: Resistance in excess of 3 ohms per conductor may
cause component failure due to insufficient AC
voltage supply.
c. Be sure to check all loads and conductors for
grounds, shorts, and miswiring.
Scroll
Table 32. AC conductors
Scroll
Distance from Unit to Control Recommended Wire Size
Scroll
000-460 feet
Scroll
461-732 feet
Scroll
733-1000 feet
Scroll
Scroll
d. Do not run the AC low voltage wiring in the same
conduit with the high voltage power wiring.
Scroll
Scroll
Controls using DC Analog Input/Outputs
Scroll
Before installing any connecting wiring between the unit
and components utilizing a DC analog input\output signal,
refer to the appropriate illustration in
the electrical access locations provided on the unit and
Table 33, p. 81
e. Use standard copper conductor thermostat wire
unless otherwise specified.
f. Ensure that the wiring between the controls and the
unit termination point does not exceed two and a
half (2.5) ohms/conductor for the length of the run.
Note: Resistance in excess of 2.5 ohms per conductor can
cause deviations in the accuracy of the controls.
Table 33. DC conductors
Distance from Unit to Control Recommended Wire Size
000-150 feet
151- 240 feet
241- 385 feet
386- 610 feet
611- 970 feet
g. Do not run the electrical wires transporting DC
signals in or around conduit housing high voltage
wires.
Units equipped with aTrane BACnet® Communication
Interface (BCI) or LonTalk® communication Interface (LCI)
option which utilizes a serial communication link;
a. Must be 18 AWG shielded twisted pair cable
(Belden 8760 or equivalent).
b. Must not exceed 5,000 feet maximum for each link.
for AC conductor sizing guidelines,
Figure 10, p. 21
for conductor sizing guidelines and;
Installation
18 gauge
16 gauge
14 gauge
for
22 gauge
20 gauge
18 gauge
16 gauge
14 gauge
81
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