3
1. Disconnect the Violet-20 fan motor lead (not the
compressor lead) from the contactor (Terminal T2 on
single-phase units, Terminal T1 on three-phase
units).
2. Install the supplied straight female terminal wire
(blue), onto the contactor (Terminal T2 on single-
phase units, Terminal T1 on three phase units.
3. Locate the Violet-20 fan motor lead from step 1. Cut
off the terminal, and strip the insulation off the last 1/
2 inch of the wire.
4. Attach the supplied blue wire with the stripped end to
the Violet-20 wire from step 3 using the supplied wire
nut. For a secure connection, use pliers to crimp the
wire nut onto the wires.
5. Using the supplied Low Ambient Control label
10767901 as a guide, carefully inspect all wiring.
Confirm that all connections are tight and that no er-
rors have been made.
6. Remove the backing from the low ambient label.
Without covering the unit wiring diagram, attach the
low ambient label on the inside of the control box
cover.
7. Replace the control box cover.
8. To complete the outdoor unit’s installation, refer to
the outdoor unit installation manual.
When the system installation is complete, and the
outdoor temperature is 35°F or higher, run the system to
confirm proper operation: At compressor startup, the
outdoor fan will not initially run. The outdoor fan will
come on when the head pressure rises to about 220 psi.
During warm weather, the outdoor fan will continue to
run as long as the compressor runs. During cool
weather, the head pressure will drop after the outdoor
fan comes on. If the head pressure drops to about 100
psi, the outdoor fan will shut off. The head pressure will
then begin to rise. The outdoor fan will restart when the
FINAL WIRING
head pressure rises to about 220 psi.
T2 T1
L2 L1
CONTACTOR
LOW AMBIENT
CONTROL
OUTDOOR FAN
MOTOR
MOTOR LEADS
CONNECTOR
WIRE NUT
VIOLET-20
(If present)
LAC01A Wiring
Single-Phase Unit Shown
If any sparking, unusual odors, or unusual sounds are
noticed, immediately disconnect the electrical power and
check wiring and electrical components.
NOTE: With the compressor running, it may be advis-
able to perform a final leak check on the low ambient cut-
out and nearby components. Read the “Servicer’s Note”
on the last page before proceeding.
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