Pipe Connection Installation Rules

GENERAL INFORMATION.

Threaded pipe connections must be tightened to the specified torque. Insufficient or excessive tightening leads to a loose joint or deformation of parts. In both cases, refrigerant leaks are possible..

Metal pipes must not have dents or kinks, so as not to reduce system efficiency due to additional resistance to refrigerant circulation. The bend radius of flexible hoses must not be less than 4 hose diameters. Flexible hoses must not be located closer than 65 mm to the exhaust manifold and pipes..

Flexible hoses must be inspected regularly and replaced with new ones if leaking, damaged, or if they have lost elasticity..

Before disconnecting any pipe, first discharge

the system of refrigerant. Work very carefully, regardless of

gauge readings. Loosen connections slowly, protecting the face and

hands from possible contact with liquid refrigerant if it remains in the pipe..

When disconnecting any pipe of the A/C system, immediately close

the openings with caps or plugs to prevent dirt and moisture from entering the system. Otherwise,

accelerated wear of compressor parts, clogging of condenser and evaporator tubes, expansion valve and compressor filters may occur.

When installing connections with round O-rings, it is necessary to

use an additional wrench to prevent rotation of the

stationary fitting. This will protect the pipe and connection parts from

possible damage. When installing flexible hose connections, it is important that the coupling screwed into the port and the fitting on the end of the hose are held simultaneously to prevent

rotation with additional wrenches when tightening the union nut..

O-rings and seating surfaces must be in perfect

condition. Burrs or dirt particles may cause refrigerant leaks. Before installing the O-ring, dip it in clean refrigerant oil: grade 525 if the system is charged with R-12, and PAG grade if the A/C system

operates on R-134a refrigerant.