Trane Horizon OABE/F, Installation, Operation And Maintenance Manual

Page: 54 / 92

Installation
54 OAU-SVX004D-EN
1. Below table 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 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.
DC Conductors
Factory-Provided Sensors
A discharge temperature sensor (VELSEN-0021) will be
factory-provided for field installation in the supply duct.
Refer to
Figure 78, p. 83 for installation instructions.
If space control is selected, a combination space
temperature/humidity sensor (BAYSENS036A) will be
factory-provided for field installation in the space. Refer to
Figure 79, p. 84 for installation instructions.
If modulating OA/RA dampers w/economizer and an
exhaust fan are selected, a static pressure sensor
(VELCON-0350) will be factory-provided for field
installation in the return duct or space. Refer to
Figure 80,
p. 85 for installation instructions.
Table 9. Zone sensor module wiring
Distance from Unit to Control Recommended Wire Size
000–150 feet
0–45.7 m
22 gauge
0.33 mm
2
151–240 feet
46–73.1 m
20 gauge
0.50 mm
2
241–385 feet
73.5–117.3 m
18 gauge
0.75 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 67. OAUTS connection B