Carrier 42PQV Installation Manual

Carrier 42PQV Installation Manual Manual pdf 13 page image

42PQV/38VBHGB - 12Refrigerant connectionsPipe Pipe insulation Fastening tape Three-way valve (liquid) Needle valve Valve cap Valve needle Allen (hex. head) wrenchThree-way valve (liquid)Use only a vacuum pump to purge air from the piping.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 three-way valves.Create a vacuum with a vacuum pump connected to the serviceconnection of the suction shut-off valve (gas), as shown, keepingthe shut-off valves completely shut until a 50 Pa (0.5 mbar)vacuum has been reached.Now open the liquid valve for 3 seconds, then quickly shut it tocheck for possible leaks.After the leak check, fully open the three-way valves.Replace caps and check for leaks.Once all connections have been completed, check for leaks byusing a leak detector specific for HFC refrigerants. Flare nutLiquid line (small diameter)Gas line (large diameter) Indoor unit Outdoor unit Vacuum pumpzOnce all connections have been completed, check for leaks byapplying soapy water to them.Finally wrap connections with anti-condensate insulation andtighten with tape, without exerting great pressure on the insulation.Repair and cover any possible cracks in the insulation.Connection pipes and electric cables between indoor and outdoorunits must be fixed to the wall with appropriate conduits. Tube Tube insulationFastening tapeAir purging