Filter Screens; Insulation Material - Emerson Copeland 2D Application Manuallines

CAUTION
Contamination or moisture! Bearing failure! Do not remove the connection
plugs until the compressor is set into the unit. This minimises any entry of
contaminants and moisture.
Refer to Figure 15 and procedure below for the brazing of the suction and discharge lines:
Figure 15: Brazing areas
 Recommended brazing material: any Silfos material is recommended, preferably with a minimum
of 5 % silver. However, 0 % silver is acceptable. For brazing connections where dissimilar or ferric
metals are joined a silver alloy rod with a minimum silver content of 30 % shall be used being
either flux-coated or with a separate flux.
 Be sure tube fitting inner and outer surfaces are clean prior to assembly.
 Using a double-tipped torch, apply heat in area 1.
 As the tube approaches brazing temperature, move the torch flame to area 2.
 Heat area 2 until braze temperature is attained, moving the torch up and down and rotating around
the tube as necessary to heat the tube evenly. Add braze material to the joint while moving the
torch around the joint to flow braze material around the circumference.
 After the braze material flows around the joint, move the torch to heat area 3. This will draw the
braze material down into the joint. The time spent heating area 3 should be minimal.
 As with any brazed joint, overheating may be detrimental to the final result.
3.4

Filter screens

CAUTION
Screen blocking! Compressor breakdown! Use screens with at least
0.6 mm openings.
The use of screens finer than 30 x 30 meshes (0.6 mm openings) anywhere in the system should be
avoided with these compressors. Field experience has shown that finer mesh screens used to protect
thermal expansion valves, capillary tubes or accumulators can become temporarily or permanently
plugged with normal system debris and block the flow of either oil or refrigerant to the compressor.
Such blockage can result in compressor failure.
3.5

Insulation material

Insulation material is commonly used in a system to insulate the suction line, suction accumulator,
expansion valve bulb or discharge line thermostat. When choosing the insulation material for A2L
applications, particular attention shall be paid to its non-electrostatic properties, as it could be a
potential ignition source.
14
Flushing oxygen-free nitrogen through the piping

during the brazing process is recommended for
applications with A1 refrigerants and mandatory for
applications with flammable A2L refrigerants.
The copper-coated steel tubes on semi-hermetic

compressors can be brazed in approximately the same
manner as any copper tube.
AGL_HA_ST_Discus_A2L_A1_EN_Rev00