Maintenance & Repair; Disassembling System Components; Provisions Of Legislation & Leak Check Requirements - Emerson Copeland Scroll ZR24KRE Application Manuallines

6 Maintenance & repair
WARNING
Conductor cables! Electrical shock! Follow the lockout/tag out procedure
and the national regulations before carrying out any maintenance or service
work on the system.
Use compressor with grounded system only. Screwed electrical connections
must be used in all applications. Refer to original equipment wiring diagrams.
Electrical connections must be made by qualified electrical personnel.
WARNING
Explosive flame! Fire hazard! Oil-refrigerant mixtures are highly flammable.
Remove all refrigerant before opening the system. Avoid working with an
unshielded flame in a refrigerant-charged system.

Disassembling system components

6.1
When disassembling system components please follow the main steps described hereunder:
1. Recover refrigerant and evacuate system using a recovery unit and vacuum pump. All the
refrigerant shall be recovered to avoid significant release.
2. Flush system with inert gas (dry nitrogen). Compressed air or oxygen shall not be used for purging
refrigerant systems.
3. Disassemble components with a cutting tool.
4. Drain, recover and dispose of compressor oil as appropriate.
Figure 22: Tube connecting areas
To reconnect:
▪ Recommended brazing material: Silfos with minimum 5% silver or silver braze used on other
compressors.
▪ Due to the different thermal properties of steel and copper, brazing procedures may have to be
changed from those commonly used.
NOTE: Since the discharge stub contains a check valve, care must be taken not to overheat
it to prevent brazing material from flowing into it.
Provisions of legislation & leak check requirements
6.2
According to EN 378-4, systems with a refrigerant charge above 3 kg shall be subject to tightness
inspection at least on an annual basis. The owner/operator shall keep an updated logbook of the
refrigerant system containing all details with regard to maintenance and repair works (quantities and
type of refrigerant changed or transferred, system components changes and replacements etc.). The
EN 378 legislation covers HFO's as well as natural refrigerants.
The F-gas Regulation (EU) No 517/2014 applies to operators of equipment such as stationary
refrigeration/air-conditioning equipment and heat pumps that contain fluorinated greenhouse gases.
Mandatory documented leak checks must be made based on how much damage could be caused
to the atmosphere if the whole charge were released. The frequency of the test inspections is based
on the GWP of the refrigerant multiplied by the estimated volume contained in each individual system
– this gives the CO
e (CO
2
26
To disconnect:
▪
Using a pipe cutting tool, cut off the suction and discharge
lines in such a manner that the new compressor can easily be
reconnected to the system.
▪
Heat joint areas 2 and 3 slowly and uniformly until the braze
material softens and the tube end can be pulled out from the
fitting.
equivalent) figure.
2
AGL_AC_ST_ZRKRE_E_Rev01