Section 11. Electrical - Low Voltage - Trane 4TWR6 Series Installation And Operation 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
11.3 Defrost Control
Defrost controls have a selectable termination tem-
perature. As shipped, defrost will terminate at 47°F.
For a higher termination temperature, cut Jumper
J2 to achieve 70°F. Refer to the Defrost Control
section in this document for more information.
Pin Identification on J5 (See Illustration)
1. TEST_COMMON (Shorting to FRC_DFT
causes the control to initiate Forced Defrost.
Leaving this pin open results in the normal
mode of operation.)
2. FRC_DFT = Forced Defrost (Short TEST_
COMMON to this pin for two (2) seconds to
initiate a forced defrost. Remove the short
after defrost initiates.)
Defrost Control Checkout
Normal operation requires:
•
Status LED on board flashing 1 time/second
in standby or 2 times/second with a call for
heating or cooling.
•
24V AC between R & B
•
24V AC between Y, Y0 & B with unit operating
•
Defrost initiation when FRC_DFT pin is shorted to TEST_COMMON pin.
If a defrost control problem is suspected, refer to the service information in control box.
18-AC104D1-1G-EN
With TEM 6/8
Outdoor
Thermostat Air Handler
Unit
R R R
24 VAC HOT
G G
FAN
B
24 VAC B/C B
Common
Blue
O O O
SOV
COOL/HEAT Y1
Y1 Y1
1st STAGE
COOL/HEAT
Y2 Y2 Y2
2nd STAGE
W1
HEATING
W
2nd STAGE
White
X2
EMERGENCY W2
X2
HEAT
Pink Black
BK BK
WH/BLK WH/BLK
• Units with pigtails require wirenuts for connections.
• In systems with multiple stages of electric heat, jumper W1 and W2 together if comfort control has only one stage of heat.
** TEM6 only - When using a BK enabled comfort control, cut BK jumper and bypass Y1 and Y2 at the air handler. Connect BK from
comfort control to BK of the air handler
• TAM7 only - When using a BK enabled comfort control, cut BK jumper on the AFC and connect BK from comfort control to BK of
the air handler. T AM7 DIP switches must be configured for "HP: 2-Stage/1 Compressor".
Note: Refer to Indoor Unit Literature for proper configuration.
WIRE SIZE
18 AWG
16 AWG
14 AWG
With TAM 7/9
Outdoor
Thermostat Air Handler
Unit
R R R
24 VAC HOT
G G
FAN
B
24 VAC B/C
B
Common
Blue
O O O
SOV
COOL/HEAT Y Y
1st STAGE l l
Y Y
O O
COOL/HEAT Y2
Y2 Y2
2nd STAGE
W1
HEATING
W
2nd STAGE
White
W2 X2
EMERGENCY
X2
HEAT
Pink Black
BK BK
WH/BLK WH/BLK
Defrost Board Detail
Jumper J2 J5 Test Pins
Table 11.1
24 VOLTS
MAX. WIRE LENGTH
150 Ft.
225 Ft.
300 Ft.
9