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12.1 COMPRESSOR REPLACEMENT PROCEDURE
Do not perform unnecessary tests before install or start a new compressor. All tests have been already
carried out in the production lines and labs
• Change the dryer, as the refrigeration system has been opened.
• For the assembling of a new compressor and brazing, follow the procedure of
Chapter
9.12
• Brazing requires specific trained personnel and brazing procedure approvals.
• Assemble the electrical components according to the wiring diagram of Figure
10.3a
• When replacing a compressor do not use the electrical components installed on the
replaced compressor. Use new components supplied with the new compressor and
check the correspondences with the ones prescribed for the specific compressor
model as listed in the
Embraco Product selector on www.embraco.com
Connect the components with the care indicated in Chapter
10.3 – Electrical
connections and wiring diagrams.
• After assembly, the system shall be tested for leakages by pressurizing.
Pressure must be according to the applicable regulation and to the design
pressure of the system components in order to avoid injuries and damages.
• When testing the low pressure side of the system, pressure to the compressor
shell must not exceed 16 bar (see Chapter
11.3 – System evacuation).
It is allowed to charge the system only with the refrigerant which must correspond with the refrigerant
officially approved, indicated in Table
6.2
When the charge procedure is finished, fix strongly the cap on the Schrader valve (or pierce strongly the
service tube, cut the Schrader valve and close the tube by brazing (eventually use a lockring cap).
Fix properly the compressor terminal cover and ensure the compressor and the system is grounded before
supply voltage.
After repairing, the system should be checked for leakages, use leak detector specific for the adopted
refrigerant, with a sensitivity of less than 3 g/year and run for analyzing the performance and Watt/Amps input.
For compressor, refer to the Technical datasheet in the
Embraco Product selector on www.embraco.com
For entire application refer to data that the cabinet manufactures should provide.
12.2 UNBRAZING SYSTEM COMPONENTS
If the refrigerant charge is removed from a scroll unit by bleeding the high side only it is sometimes possible
for the scrolls to seal, preventing pressure equalization through the compressor. This may leave the low side
shell and suction line tubing pressurized. If a brazing torch is then applied to the low side, the pressurized
refrigerant and oil mixture could ignite as it escapes and contacts the brazing flame. It is important to check
both the high and low sides with manifold gauges before un-brazing.
In the case of an assembly line repair remove the refrigerant from both the high
and low sides. Instructions should be provided in appropriate product literatures
and assembly areas.
WARNING
