Service manual

Refrigeration Section 8
8-6
11. 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) 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. Repeat steps 8 through 13 until the
pressure drop is acceptable.
14. Operate the Reach-In unit for 48-72 hours.
Then remove the suction line filter-drier and
change the liquid line drier.
15. Follow normal evacuation procedures.
FILTER DRIERS
The size of the filter-drier is important. Using an
improperly sized filter-drier will cause the Reach-In
unit to be improperly charged with refrigerant.
IMPORTANT
Driers are covered as a warranty part. Driers
must be replaced any time the system is opened
for repairs.
Refrigerant Re-Use Policy
We recommend the use of:
1. New Refrigerant
• Must be of original nameplate type.
2. Reclaimed Refrigerant
• Must be of original nameplate type.
3. Recovered or Recycled Refrigerant
• Must be recovered or recycled in accordance
with current local, state and federal laws.
• Must be from and re-used in the same
McCall product. Re-use of recovered or
recycled
refrigerant from other products is not
approved.
• Recovered refrigerant must come from a
“contaminant-free” system. To decide
whether the system is contaminant free,
consider:
a) Type(s) of previous failure(s)
b) Whether the system was cleaned,
evacuated and recharge properly
following failure(s)
c) Compressor motor burn outs and
improper past service, prevent
refrigerant re-use.