22 TWE-SVX03C-EN
Field Wiring
Note: 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 the disconnect
switch and the unit.
Note: When electric heater
accessory is used, single
point power entry or dual
point power entry is field
optional. Single point power
entry option is through the
electric heater only.
Figure 21. Field Wiring Outdoor/Indoor
TTA150B/TWE150B
TTA180B/TWE180B
TTA240B/TWE240B
TTA180C/TWE180B
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.
i. One Stage Electric heat:
add 1 additional wire, 24
volts.
ii. Two Stage Electric heat:
add 2 additional wires, 24
volts.
d. 5 wires, 24 volts.
TWA180B/TWE180B
TWA240B/TWE240B
Field Wiring:
a. 3 power wires. Line voltage.
b. 3 power wires. Line voltage
for 3 phase; 2 wires for single
phase.
c. Heat pump thermostat: 7
wires, 24 volts.
i. Electric heat: add 2
additional wire, 24 volts.
d. 7 wires, 24 volts.
i. Outdoor thermostat; add
1 additional wire, 24 volts.
ii. Electric heat: add 4
additional wires, 24 volts.
TTA090A/TWE180B
TTA120A/TWE240B
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.
i. One Stage Electric heat:
add 1 additional wire, 24
volts.
ii. Two Stage Electric heat:
add 2 additional wires, 24
volts.
d. 6 wires, 24 volts.
(2) TWA090A/TWE180B
(2) TWA120A/TWE240B
Field Wiring:
a. 3 power wires. Line voltage.
b. 3 power wires. Line voltage.
c. Heat pump thermostat: 7
wires, 24 volts.
i. Electric heat: add 2
additional wire, 24 volts.
d. 9 wires, 24 volts.
i. Outdoor thermostat; add
3 additional wire, 24 volts.
ii. Electric heat: add 2
additional wires, 24 volts.