Welbilt Koolaire KD0270A, Technician'S Handbook, Page: 114 / 136

114 Part Number STH047 Rev01 10/18
MILD SYSTEM CONTAMINATION CLEANUP
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. Do not
position heat lamps too close to plastic components, or
they may melt or warp.
Importar
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 psig.
B. Pull vacuum to 500 microns. Break the vacuum
with dry nitrogen and sweep the system.
Pressurize to a minimum of 5 psig.
C. Change the vacuum pump oil.
D. 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 pressure test as 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 ice machine.