Severe System Contamination Cleanup Procedure - Koolaire STH045 8/15 Technician's Handbook

SEVERE SYSTEM CONTAMINATION CLEANUP
PROCEDURE
1. Remove the refrigerant charge.
2. Remove the compressor.
3. Disassemble the harvest solenoid valve. If
burnout deposits are found inside the valve, install
a rebuild kit, and replace the TXV and head
pressure control valve.
4. Wipe away any burnout deposits from suction and
discharge lines at compressor.
5. Sweep through the open system with dry
nitrogen.
6. Install a new compressor and new start
components.
7. Install suction line filter-drier in front of
compressor.
8. Install a new liquid line drier.
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.
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.
D. Change the vacuum pump oil.
E. Pull vacuum to 500 microns. Run the vacuum
pump for 1 additional hour.
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 2 psig, the
filter-drier should be adequate for complete
cleanup.
B. If the pressure drop exceeds 2 psig, 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.
Replace the suction line and liquid line drier if
necessary.
13. Follow normal evacuation procedures.
116 Part Number STH045 8/15