Manitowoc Indigo ID0302A, Technician'S Handbook

Page: 219 / 296

Part Number STH025 11/16 219
9. 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 psig
(35 kPa,.35 bar).
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 psig
(35 kPa,.35 bar).
D. Change the vacuum pump oil.
E. Pull vacuum to 500 microns. Run the vacuum
pump for 1/2 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.
10. Charge the system with the proper refrigerant to the
nameplate charge.
11. Operate the ice machine for one hour. Then, check
the pressure drop across the suction line filter-drier.
A. If the pressure drop is less than 1 psig
(7 kPa,.7 bar), the filter-drier should be adequate
for complete cleanup.
B. If the pressure drop exceeds 1 psig (7 kPa,.7 bar),
change the suction line filter-drier and the
liquid line drier. Repeat until the pressure drop
is acceptable.
12. Operate the ice machine for 48-72 hours. Then
remove the suction line drier and change the liquid
line drier.
13. Follow normal evacuation procedures.