Field-Installed Control Wiring; Control Power Transformer; Controls Using 24 Vac - Trane Precedent YSJ072 Installation, Operation And Maintenance Manual

Installation

Field-Installed Control Wiring

WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could
result in death or serious injury.
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Verify that no power is
present with a voltmeter.
WARNING
Proper Field Wiring and Grounding
Required!
Failure to follow code could result in death or serious
injury.
All field wiring MUST be performed by qualified
personnel. Improperly installed and grounded field
wiring poses FIRE and ELECTROCUTION hazards. To
avoid these hazards, you MUST follow requirements
for field wiring installation and grounding as
described in NEC and your local/state/national
electrical codes.
An overall layout of the various control options available
with the required number of conductors for each control
device is illustrated in the wiring diagram located on main
control box door.
All field wiring must conform to NEC guidelines as well as
state and local 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 VA are equipped with
internal circuit breakers. If a circuit breaker trips, turn OFF
all power to the unit before attempting to reset it.
44
WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could
result in death or serious injury.
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Verify that no power is
present with a voltmeter.
The transformers are located in the control panel. The
circuit breaker is located on the right 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 the
Dimensions and Weights chapter for the electrical access
locations provided on the unit and
conductor sizing guidelines, and;
1. Use copper conductors unless otherwise specified.
2. AC control wiring between the controls and the unit
termination point should not exceed 2.5 ohms/
conductor for the length of the run.
NOTICE
Component Failure!
Resistance in excess of two and a half (2.5) ohms per
conductor could result in component failure due to
insufficient AC voltage supply.
Do not exceed two and a half (2.5) ohms per
conductor for the length of the run.
Note: Check all loads and conductors for grounds,
shorts, and mis-wiring.
3. Do not run the AC low voltage wiring in the same
conduit with the high voltage power wiring.
4. Route low voltage wiring per illustrations below.
These illustrations are representative as some models
may appear slightly different. The low voltage wiring
routing is the same.
Table 9, p. 46 for AC
RT-SVX071D-EN