Trane TTA240F Series Installation Operation & Maintenance page 11

4. Disconnect all power to the unit.
5. Remove the charging system
from the unit.
6. Replace all panels.
Electrical Wiring
TTA field wiring consists of providing
power supply to the unit, installing
the system indoor thermostat and
providing low voltage system
interconnecting wiring.
Unit Power Supply
The installer must provide line voltage
circuit(s) to the unit main power
terminals as shown by the unit wiring
diagrams in Service Facts or field
wiring. Power supply must include a
disconnect switch in a location
convenient to the unit. Ground the
unit according to local codes and
provide flexible conduit if codes
require and/or if vibration
transmission may cause noise
problems.
Important
All wiring must comply with
applicable local and national (NEC)
codes. Type and location of
disconnect switches must comply
with all applicable codes.
CAUTION
Use copper conductors only!
Unit terminals are not designed to
accept other types of conductors.
Failure to do so could result in
possible equipment damage.
TTA-SVN03A-EN
Installation
Field Wiring-Electromechanical
Control
! 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.
Determine proper wire sizes and unit
protective fusing requirements by
referring to the unit nameplate and/or
the unit Service Facts. Field wiring
diagrams for accessories are shipped
with the accessory.
Low Voltage Wiring
Mount the indoor thermostat in
accordance with the thermostat
installation instructions. Install color-
coded, weather-proof, multi-wire
cable according to the Interconnecting
Wiring diagrams in the Air Handler
IOM.
Figure 5. Typical Field Wiring - Electromechanical Control
TTA240F/TWE240E
Field Wiring:
A 3 power wires, line voltage
B 3 power wires, line voltage for 3
phase; 2 wires for single phase
C Cooling only thermostat: 4 wires,
24 volts***
– One stage electric heat: add 1
additional wire, 24 volts
– Two stage electric heat: add 2
additional wires, 24 volts
D Add 5 wires, 24 volts
Note: 1) Wiring shown with dashed
lines is to be furnished
and installed by the
customer. All customer
supplied wiring must be
copper only and must
conform to NEC and local
electrical codes. Codes
may require line of sight
between disconnect
switch and unit.
2) When electric heater
accessory is used, single
point or dual point power
entry is optional, since
single point power option
is through electric heater
only.
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