All of these steps must be completed BEFORE powering the unit, or else it could damage it.
IMPORTANT:
You will be asked to check for leaks at the piping connections multiple times throughout the
following steps of the installation, because the pressures within the lines will change once the unit
is turned on and this could reveal leaks not present during the initial check. These are imperative to
make sure your connections are not allowing refrigerant to escape the system. When checking for
leaks, if any bubbles form, it indicates the system has a leak and the screw connector needs to be
retightened. For more information about checking for leaks, please refer to the Electrical and Gas
Leak Checks section of the manual.
Refrigerant Piping Connection
Page 34
mrcool.com
4. After completing steps 1 and 2, you will now need to check all of the piping connections (at indoor unit and
outdoor unit) for leaks. You can do this by using leak detection spray, or applying a soapy water solution
(liquid detergent/water mixture) to the connection via a spray bottle or brush. If any bubbles begin to form,
that indicates there is a leak, and the connection needs to be re-tightened. Tighten the connection and
recheck it for leaks. Refer to Electrical and Gas Leaks Checks section of this manual for more information.
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