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Unit Installation
Page 8mrcool.com
3.4.1 Specifications of Connection Pipe
3.4 Refrigerant Piping Connection
Model
External diameter (inch)
Gas pipe Liquid pipe
MDUCC15024/MDUCC15036
3/4 in 3/8 in
MDUCC15048/MDUCC15060
3.4.2 Piping Preperation
NOTE: If you are installing your A-Coil with the optional MRCOOL
®
No-Vac
®
Quick-Connect
®
Line Set,
please skip forward to the installation instructions for the line set on pg. 10. Once the line set
installation is complete, continue to step 3.5 Condensate Removal and continue installation from there.
Solder Connection
If connecting piping with solder, make sure that any cuts made to the piping are round, burr free
(use a reamer), cleaned, and at a perfect 90° angle. Make sure the line set size matches the service
valve connector.
DO NOT crimp the service valve connector if the piping is of a smaller diameter.
Failure to follow these guidelines could result in refrigerant leaking from the piping. Refer to
the illustrations below.
Oblique Rough Warped
90°
Pipe
Reamer
Point down
IMPORTANT
In order to prevent the
refrigerant piping from
sweating you can
insulate them with
closed-cell insulation
foam for refrigerant
line sets which is
readily available.
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