Electrical Protection Standard (Protection Class); Refrigeration Connections; Refrigeration Piping Installation; Brazing Recommendations - Emerson Copeland EazyCool ZX Series Manual

3.2.3 Electrical protection standard (protection class)


Scroll compressors up to ZX51 are IP21 according to IEC 34.

Fan IP44 according to IEC 34.

Solenoid valve coils: IP65 according to DIN 43650.
3.3

Refrigeration connections

3.3.1 Refrigeration piping installation

IMPORTANT
All interconnecting piping should be of refrigeration grade, clean, dehydrated
and remain capped at both ends until installation. Even during installation, if
the system is left for any reasonable period of time (say 2 hours), pipes
should be re-capped to prevent moisture and contaminant from entering the
system.
It is advisable to insulate both the suction and liquid interconnecting piping between the ZX unit
and the evaporator. Usually the suction line is insulated, but the liquid line is not. However the
liquid line can pick up additional heat from the ambient and adversely affect the sub-cooling
desirable for the liquid refrigerant before it enters the expansion valve.
The pipe should be sized to ensure optimum performance and good oil return; the sizing must
also take into account the full capacity range through which this particular unit will need to
operate.
Pipe runs should be kept as short as possible, using the minimum number of directional
changes. Use large radius bends and avoid trapping of oil and refrigerant. This is particularly
important for the suction line. The suction line should ideally slope gently towards the unit.
Recommendation slope is 1/200~1/250. P traps, double risers and reduced pipe diameters may
be required for suction lines where long vertical risers cannot be avoided.
All pipes should be adequately supported to prevent sagging which can also create oil traps. The
recommended support distances are shown in Table 10 below:
Tube size
between 2 supports
12.7 mm (1/2 inch)
16.0 mm (5/8 inch
22.0 mm (7/8 inch)
28.5 mm (11/8 inch)
Table 10
IMPORTANT
Do not assume that the service connection sizes on the unit (at the service
valves) are in fact the correct size to run your interconnecting refrigeration
pipes. The service valve sizes have been selected for convenience of
installation and in some cases (larger units) these may be considered too
small; however for the very short pipe run within our units these service
connection sizes are adequate. All interconnecting piping should be sized to
satisfy the duty required.

3.3.2 Brazing recommendations

IMPORTANT
Blockage! Compressor breakdown! Maintain a flow of oxygen-free
nitrogen through the system at very low pressure during brazing. Nitrogen
displaces the air and prevents the formation of copper oxides in the system.
If allowed to form, the copper oxide material can later be swept through the
system and block screens such as those protecting capillary tubes, thermal
expansion valves, and accumulator oil return holes.
Contamination or moisture! Bearing failure! Do not remove the plugs until
the compressor is set into the unit. This minimises any entry of contaminants
and moisture.
C6.1.6/1108-0509/E
Max distance
1.20 m
1.50 m
1.85 m
2.20 m
15