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11. Electrical - low voltage
11.1 Low Voltage Maximum Wire Length
Cap
Rolled Edge to
Captivate Stem
Hex Headed
Valve System
Service Port
3/16” Hex Wrench
for Liquid Service Valve
5/16” Hex Wrench
for Sucti on Service Valve
Unit Side
of Service
Valve
Figure 25
Table 6 defines the maximum total length of low voltage wiring from
the outdoor unit to the indoor unit and to the thermostat.
24 Volts - Wire size Max. wire length
18 AWG 150 Ft.
16 AWG 225 Ft.
14 AWG 300 Ft.
Table 6
11.2 Low voltage hook-up diagrams
Air Handler Hook-up Diagram
Low Voltage connection
must be made inside the
outdoor unit case.
Figure 26
Figure 27
FOR TWO STAGE
HEAT THERMOSTAT
C
GREEN
INDOOR UNIT
OUTDOOR UNIT
Y
R
G
Y
YELLOW
BLACK
BLACK
G
C
C
R
B
RED
W1
W2
w1
w2
WHITE
Notes: “-----”The electric auxiliary heat connection(optional).
W:Electric auxiliary heat signal.
W1 :The first Electric auxiliary heat signal.
W2 :The second Electric auxiliary heat signal.
FOR ONE STAGE
HEAT THERMOSTAT
C
GREEN
INDOOR UNIT OUTDOOR UNIT
Y
RG Y
YELLOW
BLACK
BLACK
G
C
C
R
B
RED
Control Wiring for A/C Systems
W
w1 w2
WHITE
Access
Panel
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