electrical
Installation requirements
Unit Wiring Diagrams
Specific unit wiring diagrams are provided inside each unit and can be easily removed for reference.Use these diagrams for connections or trouble analysis. Wiring diagrams are attached on the inside of the front panel of vertical cabinet & recessed models and on the fan and motor panel of vertical concealed & all horizontal models.
Supply Power Wiring
WARNING
Hazardous Voltage w/Capacitors! Disconnect all electric power, including remote disconnects and discharge all motor start/run capacitors before servicing. Follow proper lockout/ tagout procedures to ensure the power cannot be inadvertently energized. For variable frequency drives or other energy storing components provided by Trane or others, refer to the appropriate manufacturer’s literature for allowable waiting periods for discharge of capacitors. Verify with an appropriate voltmeter that all capacitors have discharged. Failure to disconnect power and discharge capacitors before servicing could result in death or serious injury.
Refer to the unit nameplate to obtain the minimum circuit ampacity (MCA) and maximum fuse size (MFS) or maximum circuit breaker (MCB) to properly size field supply wiring and fuses or circuit breakers.
Refer to the unit operating voltage listed on the unit wiring schematic, submittal, or nameplate. Reference the wiring sche- matic for specific wiring connections.
CAUTION
Use Copper Conductors Only! Unit terminals are not designed to accept other type conductors. Failure to use copper conductors may result in equipment damage.
Note: All field wiring should conform to NEC and all applicable state and local code requirements. The control panel box is always on the end opposite the piping connections. Access the control box by removing the two screws that secure the front cover. This will allow the panel to be removed, to provide access to the electrical components.
WARNING
Hazardous Electrical Shorts! Insulate all power wire from sheet metal ground. Failure to do so may cause electrical shorts that could result in death or serious injury.
If the unit does not have a disconnect switch, the power leads and capped ground wire are inside the control panel.
If the unit has a disconnect switch, the power leads are wired to the junction box switch on the control panel. Pull the capped ground wire into the junction box.
Electrical Grounding
Restrictions
All sensor and input circuits are normally at or near ground (common) potential. When wiring sensors and other input devices to the Tracer controller, avoid creating ground loops with grounded conductors external to the unit control circuit. Ground loops can affect the measurement accuracy of the controller.
CAUTION
Equipment Damage!
Unit transformer IT1 provides power to
All input/output circuits (except isolated relay contacts and optically isolated inputs) assume a grounded source, either a ground wire at the supply transformer to control panel chassis, or an installer supplied ground.
Wall Mounted Control
Interconnection Wiring
The installer must provide interconnec- tion wiring to connect wall mounted devices such as a fan mode switch or zone sensor module.
Refer to the unit wiring schematic for specific wiring details and
Refer to Table
Recommendation: Do not bundle or run interconnection wiring in parallel with or in the same conduit with any
Table
device | wire size | range |
fan speed switch | 14 - 22 AWG | 500 |
zone sensor | 16 - 22 AWG | 200 |
Note: Do not connect any sensor or input circuit to an external ground connection.
36 |