38VYM R-410AGB - 8 Three-way valve Needle valve Valve cap Valve needle Two-way valve Allen (hex. head) wrench Gas line (large diameter) Liquid line (small diameter)Service connectionIndoor unitOutdoor unitVacuum pumpAir purgingUSE ONLY A VACUUM PUMP TO PURGE AIR FROM THE PIPING.The air purging procedure must be performed for each of theindoor units.NEVER use the system compressor as a vacuum pump.NEVER use the unit refrigerant gas to purge the connectingpipes.No additional refrigerant has been provided in the unit for thispurpose.Remove the caps from the two and three-way valves.Create a vacuum with a vacuum pump connected to the serviceconnection of the suction shut-off valve, as shown, keeping theshut-off valves completely shut until a 50 Pa (0.5 mbar) vacuumhas been reached.Now open the two-way valve for 3 sec., then quickly shut it to checkfor possible leaks.After the leak check, fully open the two and three-way valves.Replace caps and check for leaks.Once all connections have been completed, check for leaks byusing a leak detector designed for HFC refrigerants.Finally wrap the valves and pipes with anti-condensate insulationand tighten this with tape, without exerting too much pressure onthe insulation.Repair and cover any possible cracks in the insulation.Fix the pipes to the wall with hooks or conduits.Refrigerant connectionsPipe Pipe insulation Fastening tape  

general information

refrigerant connections

Carrier 38VYM Series Installation Manual