3
10. Carefully replace the service valve panel and screws.
Carefully swing the control box clockwise to it’s
original position. Reattach it using the screws re-
moved earlier.
Units With A High Pressure Control
1. Remove and save the screws holding the control box
cover in place.
2. Remove and save the control box cover.
3. Remove and save the three screws holding the
control box in place. Carefully swing the control box
about 90° counterclockwise.
4. Using two wrenches to prevent the line from twisting,
remove the high pressure cutout from the high side
fitting. (The high pressure cutout has blue wires.) Do
not remove any wires from the high pressure cutout.
5. Place a teflon seal in the female opening of the
refrigerant tee. Install the refrigerant tee on the high
side access fitting. Using a backup wrench, tighten to
115 to 120 inch-pounds to avoid refrigerant leaks.
6. Reinstall the high pressure cutout on one end of the
tee. Tighten to 115 to120 inch-pounds to avoid
refrigerant leaks.
7. Place a teflon seal in the fitting of the low ambient
control. Install the low ambient control on the
remaining end of the tee. Tighten to 115 to 120 inch-
pounds to avoid refrigerant leaks.
8. Without running the unit, perform a preliminary leak
check on the tee, low ambient control, and the high
pressure cutout. If a leak is found, tighten the joint
slightly and recheck.
EXTENSION TUBE
VAPOR LINE
SERVICE VALVE
Service Valve with Extension Tube, Tee
and Cut-Out
Figure 1
9. Route the blue wires from the low ambient control
into the unit’s control box. To avoid equipment
damage, route the wires so they avoid the fan.
10.Carefully swing the control box clockwise to its
original position. Reattach it, using the screws
removed earlier.
Wiring
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. The low ambient control includes a blue wire with a
straight female terminal. Install this wire on the
contactor: terminal T2 on single-phase units, termi-
nal 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. The low ambient control includes a blue wire with a
stripped end. Use the wire nut provided to attach
this wire to the Violet-20 wire from step 3. For an
adequate connection, pliers must be used to crimp
the wire nut onto the wires.
5. Using the low ambient label 10767901 as a guide,
inspect all wiring carefully. Confirm that all connec-
tions are tight and that no errors have been made.
Low Ambient Kit
Installed In This Unit
T2 T1
L2
L1
CONTACTOR
LOW AMBIENT
CONTROL
OUTDOOR FAN
MOTOR
MOTOR LEADS
CONNECTOR
WIRE NUT
VIOLET-20
Single Phase Unit Shown
Figure 2
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. 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
(IF PRESENT)
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