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506318-03CPage 4 of 11 mrcool.com
Before making braze connections, be sure all joints are
clean. Before heat is applied for brazing, dry nitrogen
and scale formation on the inside of the tubing.
The following is the recommended method for making
braze connections at the refrigerant line connections:
1. Debur and clean refrigerant tube end with emery cloth
or steel brush.
2.
3. Wrap wet rags over valves to protect from heat.
4.
5. Braze joint, using a suitable brazing alloy for copper to
copper joints.
6. Quench the joint and tubing with water using a wet
help cool area.
Leak Check
Refrigeration lines and indoor coil must be checked for leaks
after brazing and before evacuation. The recommended
procedure is to apply a trace amount of vapor refrigerant
(approximately two ounces or 3 psig) into the line set and
indoor coil, then pressurize with 150 psig of dry nitrogen.
Use a refrigerant leak detector to check all joints. The
system may also be checked for leaks using a halide torch
or pressure and soapy solution. After completion of leak
check, relieve all pressure from system before evacuation.
Evacuating and Charging Instructions
NOTE: Intentional release of CFC or HCFC refrigerant to
the atmosphere violates Federal Law. It may also violate
State and Local Codes. Check all Federal, State and Local
Codes before proceeding.
These outdoor units are pre-charged at the factory with
adequate refrigerant to handle 15 feet of refrigerant tubing.
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
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 the
proper refrigerant. 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
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 coined edge.
Wrench sizes:
• 3/8 service valve: 3/16” Hex wrench
• 3/4 service valve: 5/16” Hex wrench
• 7/8 service valve: 5/16” Hex wrench
Replace service valve cap and torque to 8-11 ft-lb on
3/8” valves; 12-15 ft-lb on 3/4” valves; 15-20 ft-lb on 7/8”
valves. Use backup wrench on valve body when torquing
valve cap.
Install Electrical Accessories
Refer to the instructions packaged with the accessories.
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