Section 11. Electrical - Low Voltage - Trane 4TWX8 Installer's Manual

10.1 Open the Liquid Service Valve
WARNING
s s
Extreme caution should be exercised when
opening the Liquid Line Service Valve. Turn
counterclockwise until the valve stem just
touches the rolled edge. No torque is required.
Failure to follow this warning will result in abrupt
release of system charge and may result in
personal injury and /or property damage.
Important: Leak check and evacuation must be
completed before opening the service valves.
STEP 1 - Remove service valve cap.
STEP 2 - Fully insert 3/16" hex wrench into the
stem and back out counterclockwise until valve
stem just touches the rolled edge (approximately
five (5) turns.)
STEP 3 - Replace the valve cap to prevent
leaks. Tighten finger tight plus an additional 1/6
turn.

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
*AM7 Air Handler Hook-up (Continued)
OUTDOOR OUTDOOR
Control
Board
HP
1
1
R4
1
R NET 2
R1
U1
R13
R14
18-BC91D1-6B-EN
on
}
Capacity (Tons)
AC (System)
2 (Stages)
2 (Compressor)
S1
INDOOR
R NET 1
on
CFM/Ton
Cool Off Delay
Torque
CFM
D9
S2
C10
+12V
R22
Cap
Unit Side
of Service
Valve
Service Port
Table 11.1
24 VOLTS
WIRE SIZE
18 AWG
16 AWG
14 AWG
Must configure to "OFF" for heat pump.
Must configure to "ON" for 16 SEER
two-stage compressors.
3/16" Hex Wrench
Rolled Edge to
Captivate Stem
Hex Headed
Valve System
MAX. WIRE LENGTH
150 Ft.
225 Ft.
300 Ft.
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