Refrigerant Line Connections
NOTICE
THIS UNIT IS SHIPPED WITH A NITROGEN/HELIUM HOLDING CHARGE ONLY. UNIT MUST BE EVACUATED AND CHARGED PER INSTALLATION INSTRUCTIONS WITH REFRIGERANT LISTED ON SERIAL RATING PLATE.
NOTE: Holding charge must be removed before brazing. Open service valves slowly to remove holding charge. Close valves before brazing to prevent contaminants from entering system.
IMPORTANT: To avoid overheating the service valve, TXV valve, or filter drier while brazing, wrap the component with a wet rag, or use a thermal heat trap compound as recommended by the compound manufacturer. Use a brazing alloy of 2% minimum silver content. Do not use flux.
1.The ends of the refrigerant lines must be cut square, de- burred, cleaned, and be round and free from nicks or dents. Any other condition increases the chance of a refrigerant leak.
2.“Sweep” the refrigerant line with nitrogen or inert gas dur- ing brazing to prevent the formation of
3.After brazing, quench the joints with water or a wet cloth to prevent overheating of the service valve.
4.Ensure the filter drier paint finish is intact after brazing. If the paint of the steel filter drier has been burned or chipped, repaint or treat with a rust preventative. This is especially important on suction line filter driers which are continu- ally wet when the unit is operating.
NOTE: Be careful not to kink or dent refrigerant lines. Kinked or dented lines will cause poor performance or compressor damage.
Do NOT make final refrigerant line connection until plugs are removed from refrigerant tubing.
NOTE: Before brazing, verify indoor piston size by checking the piston kit chart packaged with indoor unit.
Leak Testing (Nitrogen or
WARNING
To avoid the risk of fire or explosion, never use oxygen, high pressure air or flammable gases for leak testing of a refrigeration system.
WARNING
To avoid possible explosion, the line from the nitrogen cylinder must include a pressure regulator and a pressure relief valve. The pressure relief valve must be set to open at no more than 150 psig.
Pressure test the system using dry nitrogen and soapy water to locate leaks. If you wish to use a leak detector, charge the system to 10 psi using the appropriate refrigerant then use nitrogen to finish charging the system to working pressure then apply the detector to suspect areas. If leaks are found, repair them. After repair, repeat the pressure test. If no leaks exist, proceed to system evacuation.
System Evacuation
Condensing unit liquid and suction valves are closed to contain the charge within the unit. The unit is shipped with the valve stems closed and caps installed.
WARNING
REFRIGERANT UNDER PRESSURE!
Failure to follow proper procedures may cause property damage, personal injury or death.
NOTICE
THIS UNIT IS SHIPPED WITH A NITROGEN/HELIUM HOLDING CHARGE ONLY. UNIT MUST BE EVACUATED AND CHARGED PER INSTALLATION INSTRUCTIONS WITH REFRIGERANT LISTED ON SERIAL RATING PLATE.
NOTICE
UNITS SHIPPED WITH A HOLDING CHARGE ARE INTENDED FOR COMPONENT REPLACEMENT ONLY ON EXISTING SYSTEMS, AND NOT INTENDED FOR USE IN NEW SYSTEMS OR NEWLY CONSTRUCTED HOMES.
NOTICE
UNITS MUST ONLY BE USED AS REPLACEMENT COMPONENTS FOR
NOTE: Holding charge must be removed before brazing.
1.Openservice valves before attaching vacuum pump.
2.Connect the vacuum pump with 250 micron capability to the service valves.
3.Evacuate the system to 250 microns or less using suc- tion and liquid service valves. Using both valves is nec- essary as some compressors create a mechanical seal separating the sides of the system.
4.Close pump valve and hold vacuum for 10 minutes. Typi- cally pressure will rise during this period.
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