Coupling Instructions
The couplings on the ends of the pre-charged line
sets are self-sealing when installed properly.
Follow these instructions carefully.
These steps must be performed by an EPA
Certified Type II or higher technician.
Initial Connections
1. Remove the protector caps and plugs. Wipe the
seats and threaded surfaces with a clean cloth to
remove any possible foreign matter.
2. Thoroughly lubricate the threads, o-rings,
diaphragms and all internal coupling surfaces with
polyolester refrigerant oil.
3. Position the fittings on the correct connections
on the condenser and ice machine.
•
The
1
2
“ discharge line (schrader valve end)
goes to the remote condenser fitting marked
“discharge line”.
•
The
3
8
“ liquid line (schrod valve end) goes to
the remote condenser fitting marked “liquid
line”.
•
The
1
2
“ discharge line goes to the ice maker
fitting marked “discharge line”.
•
The
3
8
“ liquid line goes to the ice maker
fitting marked “liquid line”.
Final Connections:
4a. Begin to tighten the couplings together by
hand. Continue to turn the swivel nuts by hand
until it is certain that the threads are properly
engaged.
4b. Using two wrenches, one to rotate the swivel
nut and one to hold the tubing in place, tighten
each coupling.
It is CRITICAL that ONLY the NUT on the
pre-charged tube be turned, or the diaphragms will
be torn by the piercing knives and become loose in
the refrigeration system causing severe
operational problems.
Note: As the coupling is tightened, the diaphragms
in the quick connect couplings will begin to be
pierced. As that happens, there will be increased
resistance to tightening the swivel nut.
4c. Continue tightening the swivel nut until it
bottoms out or a very definite increase in
resistance is felt (no threads should be showing).
Do NOT overtighten.
5. Use a marker or pen to mark a line on the
coupling nut and unit panel. Then tighten the
coupling nut an additional one-quarter turn. The
line will show the amount that the nut turns.
6. After all connections have been made, and after
the liquid line valve has been opened (do not open
yet), check the couplings for leaks.
CME456R
December 2000
Page 9
Clean and Lubricate Couplings
Tighten Swivel Nut
Rotate Swivel Nut ¼ Turn More
Note: The system charge is contained in the
receiver tank of the ice machine. Only “holding"
charges are present in the “pre-charged" tubing or
the condenser.
