Delfield Specification Line GA Series, Оригинальное руководство по обслуживанию

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Part Number GA_SM 08/18 59
Section 8 Refrigeration
Mild System Contamination Clean-Up
Procedure
1. Replace any failed components.
2. If the compressor is good, change the oil.
3. Replace the liquid line drier.
NOTE: If the contamination is from moisture, use heat
lamps during evacuation. Position them at the compressor,
condenser and evaporator prior to evacuation.
Important
Dry nitrogen is recommended for this procedure. This
will prevent CFC release.
4. Follow the normal evacuation procedure, except
replace the evacuation step with the following:
A. Pull vacuum to 1000 microns. Break the vacuum
with dry nitrogen and sweep the system. Pressurize
to a minimum of 5 PSI.
B. Pull vacuum to 500 microns. Break the vacuum
with dry nitrogen and sweep the system. Pressurize
to a minimum of 5 PSI.
C. Change the vacuum pump oil.
D. Pull vacuum to 250 microns. Run the vacuum
pump for ½ hour on self-contained models, 1 hour
on remotes.
NOTE: You may perform a standing vacuum test to make a
preliminary leak check. You should use an electronic leak
detector after system charging to be sure there are no leaks.
5. Charge the system with the proper refrigerant to the
nameplate charge.
6. Operate the Reach-In unit.
Severe System Contamination Clean-Up
Procedure
1. Remove the refrigerant charge.
2. Remove the compressor.
3. Remove the liquid line drier.
4. Replace the capillary tube.
5. Wipe away any burnout deposits from suction and
discharge lines at compressor.
6. Sweep through the open system with dry nitrogen.
Important
Refrigerant sweeps are not recommended, as they
release CFC’s into the atmosphere.
7. Install a new compressor and new start components.
8. Install a suction line filter-drier (with acid and moisture
removal capability) of adequate size. Place the filter
drier as close to the compressor as possible.
9. Install inlet and outlet access valves.
10. Install a new liquid line drier.
11. Follow the normal evacuation procedure, except
replace the evacuation step with the following:
A. a) Pull vacuum to 1000 microns. Break the vacuum
with dry nitrogen and sweep the system. Pressurize
to a minimum of 5 PSI.
B. Change the vacuum pump oil.
C. Pull vacuum to 500 microns. Break the vacuum
with dry nitrogen and sweep the system. Pressurize
to a minimum of 5 PSI.
D. Change the vacuum pump oil.
E. Pull vacuum to 250 microns. Run the vacuum
pump for ½ hour on self-contained models, 1 hour
on remotes.
NOTE: You may perform a standing vacuum test to make a
preliminary leak check. You should use an electronic leak
detector after system charging to be sure there are no leaks.
12. Charge the system with the proper refrigerant to the
nameplate charge.
13. Operate the Reach-In unit for one hour. Then check the
pressure drop across the suction line filter-drier.
A. If the pressure drop is less than 1 PSI, the filter-drier
should be adequate for complete clean up.
B. If the pressure drop exceeds 1 PSI, change the
suction line filter-drier and the liquid line drier.