Trane YSJ072A Installation, Operation And Maintenance Manual page 41

Optional TBUE Wiring (Through-the-
Base Electrical Option)
Location of the applicable electrical service is illustrated
below. Refer to the customer connection diagram that is
shipped with the unit for specific termination points. The
termination points, depending on the customer option
selected would be a factory mounted non-fused disconnect
switch (UDC) or circuit breaker (UCB). If neither a factory
mounted non-fused disconnect switch (UDC) or circuit
breaker (UCB) was factory mounted, field wiring
connections should be terminated in the control box at
main panel power terminal block (HTB1).
Provide proper grounding for the unit in accordance with
local and national codes.
Notes:
• Black gasket is shipped from the factory and is
located in the literature Ship With bag in the
control box. Apply black gasket around conduit
plate on all four sides after installation to
prevent air leakage from the building entering
the electrical enclosures.
• Seal any unused unit penetrations and around
conduit and wiring at all unit and curb
penetrations.
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.
RT-SVX071A-EN
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.
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. Ensure that the AC control wiring between the controls
and the unit's termination point does 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: Be sure to 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.
Installation
Table 7, p. 43 for AC
41