YMGI WMMS-09E-V2A(57)2 Installer's Instruction & User's Manual page 6


Be sure to only hire a certified and currently licensed HVAC Company to complete 100% of the installation so that all
details of the installation are performed correctly and completely.

Be sure to have ONLY the licensed HVAC professional perform all aspects of the installation. Factory Warranty will be
void if any portion of the installation is not performed by a licensed HVAC contractor/technician. DIY or partial DIY will
also void ALL factory warranties.

When hiring an HVAC technician that is offering their services as a "side job" and not hiring a licensed HVAC company
may pose possible risk. This may result in an incomplete or unsatisfactory installation, no guarantee for workmanship
and lack of maintenance and further service to your unit.

Have the installation technician read in full the installation manual and all supplied documents for the product model
you purchased. Details within the documentation contributes greatly to the success and quality of the installation.
Experience with other manufacturers may not be applied fully to another manufacturer, although there will be similarities
there will also be differences. Ignoring the provided installation procedures is an act of negligence and may cause unit
failure or damage which could be irrevocable and permanent.

It is possible for a licensed contractor/technician to make a mistake during the installation. YMGI doesn't supervise nor
is able to control the contractor/technician's installation. It is critical that the installer take each variable into account
during the initial installation. This will ensure a complete and professional installation and that all units work properly.
The following will damage the unit and its key components resulting in loss of factory warranty:
1. Any foreign substances introduced into the system because of failure to seal the ends of the refrigeration piping before
pulling the piping through any structures at time of installation.
2. Not installing an oil P-trap in the copper suction line where the indoor unit is located 18 feet or more below the outdoor
unit.
3. Cross piping and/or cross wiring of any units including more than one single zone or a multi zone system.
4. Not conducting a positive leak check prior to the negative leak check.
5. Not conducting a positive leak check by charging the system with dry-nitrogen 350 PSI to hold for 3+ hours, and
performing soap bubble testing.
6. Not conducting a negative leak check by evacuating the copper lines for 30 minutes for each zone. Vacuum must be
held at 500 microns or better for at least 60 minutes, starting 60-minute timer after the vacuum pump is turned off.
7. Not selecting the correct size of wire or circuit breaker.
8. Not answering ALL questions in the technician's checklist located inside the warranty registration form.
The following may be overlooked, ignored, or considered unimportant during your installer's installation, but will
cause your unit to underperform and may cause unit failure.
1. Any kinks in or improper bending of the copper piping.
2. Any poorly formed flares or not centering the flare with the flare nut, or not tightening all connections.
3. Not trial testing each indoor unit individually.
4. Not reading technical data (temp/time/pressure/current) after the system is stabilized (normally the compressor needs
to run at least 10 minutes before reading the data). If the data is read too early may lead to inaccurate assessments
about the unit.
In an effort to help protect our customers from possible faulty installations that can lead to premature unit failure, YMGI
provides the above information for you and the technician. You can observe while your system is being installed, even
though your observation is not a guarantee your system is being or has been installed properly and professionally. With the
information provided above, you will know some things to look for and questions you can ask. If at any time you feel there
may be an issue with the installation, please have your technician contact YMGI at (866)833-3138 x 703 with any questions,
issues or concerns you may have.
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