Warnings and Cautions
WARNING
R410-A Refrigerant under Higher Pressure than R-22!
The units described in this manual use R410-A refrigerant which operates at 50 to 70% higher
pressures than R-22. Use only R-410A approved service equipment. Refrigerant cylinders are
painted with "pink" color to indicate the type of refrigerant and may contain a "dip" tube to allow
for charging of liquid refrigerant into the system. For specic handling concerns with R-410A,
please contact your local sales ofce.
Failure to use R-410A approved service equipment could result in standard equipment
exploding under R-410A higher pressure which could result in death or serious injury.
NOTICE
Use appropriate oil with R410A systems. Oil type is found at the bottom of Connection Pipe
Requirements table (included in the outdoor unit installation manual). R-410A systems utilize
POE (Polyolester) or PVE(Polyvinyl Ether) oil. Both oil types absorb moisture readily, yet,
lubrication properties vary. Do not leave the sealed system open to atmosphere except during
service for a short period of time. If the sealed system is left open longer than four hours,
the compressor oil must be changed. These systems utilize strainers placed before and after
the expansion device in the outdoor unit, if debris or moisture is suspected, these strainers
must be changed. Do not break a vacuum with air. Do not leak check the sealed system with
compressed air. Unless instructed by factory service representative, external refrigeration driers
are prohibited.
USE ONLY THE FACTORY RECOMMENDED OIL TYPE!
Important!
Environmental Concerns
Scientic research has shown that certain man-made chemicals can aect the earth's naturally occurring stratospheric ozone
layer when released to the atmosphere. In particular, several of the identied chemicals that may aect the ozone layer
are refrigerants that contain chlorouorocarbons (CFC's) and those containing hydro-chlorouorocarbons (HCFC's). Not all
refrigerants containing these compounds have the same potential impact to the environment. The Company advocates the
responsible handling of all refrigerants, including industry replacements for CFC's such as HCFC's and HFC's.
Responsible Refrigerant Practices
The manufacturer believes that responsible refrigerant practices are important to the environment, our customers, and the air
conditioning industry. All technicians who handle refrigerants must be certied. The Federal Clean Air Act (Section 608) sets
forth the requirements for handling, reclaiming, recovering and recycling of certain refrigerants and the equipment that is used
in these service procedures. In addition, some states or municipalities may have additional requirements that must also be
adhered to for responsible management of refrigerants. Know the applicable laws and follow them.
88-M4MHW18-1C-EN 3
Installer's Guide
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