Section 11. Electrical - Low Voltage - Trane A4HP5 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
HEAT PUMP SYSTEMS
Thermostat Air Handler
R
24 VAC HOT
G
FAN
24 VAC
B/C
Common
O
SOV
COOL/HEAT
Y
1st STAGE
HEATING
W
2nd STAGE
EMERGENCY
X2
HEAT
With Furnace
Thermostat Furnace
R R
24 VAC HOT
G G
FAN
24 VAC
B/C B
Common
Y1 Y
COOL
HEATING
W1
W1
*
W2
W2
10
Outdoor
Unit
R R
24 VAC HOT
G
FAN
B
24 VAC
B
Common
Blue
O
COOLING
Y
HEAT
W1
White
X2
W2
Pink Black
With Variable Speed Furnace
Outdoor
Thermostat
Unit
24 VAC HOT
FAN
24 VAC
B
Common
Y
COOL
HEATING
AC SYSTEMS
Thermostat Air Handler
R R
G G
B
B/C
Blue
Y
W1
W
White
W2
Pink
Outdoor
Furnace
R R
G G
B/C B
O
Y1 Y
**
Y
LO
W1 W1
*
W2 W2
BK
BK
**
Table 11.1
24 VOLTS
WIRE SIZE MAX. WIRE LENGTH
18 AWG
16 AWG
14 AWG
Outdoor
Unit
In AC systems for multiple stages
of electric heat, jumper W1 and W2
together if comfort control has only
one stage of heat.
B
Y
Unit
• Units with pigtails require wirenuts for
B
connections. Cap all unused wires.
• In AC systems for multiple stages of heat,
jumper W1 and W2 together if comfort
control has only one stage of heat.
* If equipped with second stage heat
** When using a BK enabled comfort control,
Y
cut BK jumper and bypass Y and YLo at the
furnace. Connect BK from comfort control to
BK of the furnace
88-A4HP5001-1D-EN
150 Ft.
225 Ft.
300 Ft.