Section 11. Electrical - Low Voltage - Trane 4TTX8024A Installer's Manual

Section 11. Electrical - Low Voltage

11.1 Low Voltage Maximum Wire Length
Table 11.1 defines the maximum total length of
low voltage wiring from the outdoor unit, to the
indoor unit, and to the thermostat.
11.2 Low Voltage Hook-up Diagrams
4TEE3F31-66
Variable Speed Air Handler Hook-up
Diagram
Comfort Control
R
Y1
Y2
G
W1
W2
W3
B
Notes:
1. If electric heat does not have 3rd contactor (CH), connect a jumper wire
from W3 to W2. If electric heat does not have 2nd contactor (BH), connect a
jumper wire from W2 to W1.
2. Installer must remove the factory installed jumper between R and BK on the
air handler terminal strip.
3. Installer must add a field installed jumper between R and O on the air han-
dler terminal strip.
4. 4TTX8 units require 80% airflow with Y1 (low stage) and 100% airflow with
Y2 (high stage).
A) Connect Y1 from comfort control to Y at the VS air handler and to Y1
(yellow/black) at the AC.
B) Connect Y2 from comfort control to BK at the VS air handler and to Y2
(yellow/red) at the AC.
5. Comfort control may not have W2 or W3 terminals.
18-AC95D1-1
Variable Speed
Air Handler
R
O
Red
Y
LO
Yellow
Y
Brown
BK
Green
G
White
W1
Black
W2
Purple
W3
Blue
B
WIRE SIZE
18 AWG
16 AWG
14 AWG
Air Conditioner
Neatly bundle all low voltage
wires behind the service
valve cover as shown.
Yellow/Black
Yellow
Brown
Yellow/Red
Table 11.1
24 VOLTS
MAX. WIRE LENGTH
150 Ft.
225 Ft.
300 Ft.
Blue
Blue
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