NOTE: DO NOT use any portion of the charge for
purging or leak testing. It is mandatory that
a thorough evacuation of the refrigeration
lines and indoor coil be performed.
The liquid line and suction line service valves have been
closed after final testing at the factory. DO NOT disturb
these valves until the lines have been leak checked and
evacuated or the charge in the unit may be lost.
1. Connect the vacuum pump to the center hose of the
manifold gauge set, the low-pressure manifold gauge
to the vapor service valve and the high pressure
manifold gauge to the liquid service valve.
NOTE: Unnecessary switching of hoses can be
avoided and complete evacuation of all lines
can be achieved by also connecting a
branch hose from the manifold gauge center
port to a cylinder of R-22. Provide a
separate shut-off valve to vacuum pump to
avoid contaminating vacuum pump oil with
refrigerant.
2. The valves should be kept in the "front seated"
(closed) position. This will allow evacuation of the
refrigeration lines and the indoor coil, without
disturbing the factory charge in the outdoor unit.
3. Follow the vacuum pump manufacturer's instructions.
Allow the pump to operate until the system has been
evacuated down to 300 microns. Allow the pump to
continue running for an additional 15 minutes. Turn
OFF the pump and leave the connections secured to
the two (2) service valves. After 5 minutes, if the
system fails to hold 500 microns or less, check all
connections for tight fit and repeat the evacuation
procedure.
4. Isolate the vacuum pump from the system by closing
the shutoff valves on the gauge-set. Disconnect the
vacuum pump.
Opening Service Valves
After evacuation of the connecting lines, remove the
service valve cap and fully insert the hex wrench into the
stem. A back-up wrench is required on the valve body to
open the valve stem. Back-out counterclockwise until the
valve stem just touches the retaining ring.
CAUTION
BODILY INJURY HAZARD!
This is not a backseating valve. Care must be
taken to prevent dislodging retainer ring when
opening valve.
FAILURE TO DO SO COULD RESULT IN BODILY
INJURY.
Replace service valve cap and torque to 8-11 ft-lb on
1/4" and 3/8" valves; 12-15 ft-lb on 5/8" and 3/4" valves;
15-20 ft-lb on 7/8" valves.
NOTE: The cap is the primary seal and must be
tightened to prevent leaks.
Torque gauge port caps hand tight after adjusting charge
per "Adjusting Charge" section.
Electrical Connections
WARNING
ELECTRICAL SHOCK HAZARD!
Turn OFF electric power before connecting
unit, performing any maintenance or
removing panels or doors.
FAILURE TO DO SO COULD RESULT IN BODILY
INJURY OR DEATH.
Be sure to check all local codes to determine that the
unit is installed accordance with local requirements.
Consult the National Electric Code for wire size
requirements. Use 60° C wire or higher. Always provide
ground connections to the outdoor unit. Power supply
must agree with rating on unit nameplate.
Provide line voltage power supply to unit from a properly
sized disconnect switch. Route power and ground wires
from disconnect switch to unit. Line voltage connections
are made at the line side of the contactor in the electrical
box of the condensing unit. Follow the appropriate wiring
diagram attached to inside of the access door of the unit.
Proper fusing recommendations are also indicated on
Unit Rating Plate. In general, the best fuse for any unit is
the smallest fuse that will hold equipment on line under
normal use and service without nuisance tripping breakers
or blowing of fuses. Time delay fuses are recommended
to prevent blowing due to starting current (the current in
rush when equipment starts is referred to as the Locked
Rotor Amps or (LRA). A fuse of this kind properly sized
will give maximum equipment protection.
Control Wiring
The control voltage is 24 Vac. High quality insulated 18
AWG is recommended for control wiring. Table 2 provides
a guideline for wire size and distance. For lengths longer
than 150 feet, contact your local distributor for technical
service.
20407502 ISSUE 0144 Page 4 of 8
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