New Hyper-Heating Inverter Redefines Heat Pump

Thursday, January 17, 2008


New technology offers tremendous heating capacity
at incredibly low temperatures, down to minus 13 degrees Fahrenheit

SUWANEE, Ga., January 17, 2008 - Mitsubishi Electric HVAC Advanced Products Division, Suwanee, Ga., has introduced its new Hyper-heating INVERTER (H2i™) technology for select Mr. Slim® split-ductless and CITY MULTI® VRFZ systems, a Mitsubishi Electric HVAC exclusive.

"Mitsubishi Electric HVAC's patent-pending flash technology allows the new H2i outdoor units to operate at 100 percent of rated heating capacity at 5 degrees Fahrenheit," says Meredith Emmerich, manager of application support, Mitsubishi Electric HVAC. "At minus 4 degrees Fahrenheit, the system operates at 87 percent of rated heating capacity; and at minus 13 degrees Fahrenheit, the system operates at 70 percent of rated heating capacity."

The patent-pending flash process cools the compressor which allows for higher compressor speeds at lower temperatures without overheating. This process also increases the mass flow rate in the system to provide phenomenal heating performance at low temperatures.

According to Emmerich, traditional heat pumps do not operate at such low temperatures with full capacity compared to the new H2i outdoor unit. H2i systems employ technology that re-collects heat energy that is normally wasted in the flash process at the outdoor coil. This process helps the H2i systems overcome issues commonly associated with conventional heat pumps such as decreases in low-side pressure, refrigerant mass flow rate and operational capacity. "The INVERTER-driven compressor in the H2i outdoor unit varies its speed to precisely match the zone load requirements for year-round comfort and effective energy usage," says Emmerich.

The new H2i systems are available in select Mr. Slim split-ductless and CITY MULTI VRFZ models.

The Mr. Slim H2i P-Series outdoor heat pump has a 36,000 BTU/h cooling capacity and 38,000 Btu/h heating capacity. The sleek outdoor unit connects to either the P-Series wall-mounted or ceiling-recessed cassette indoor units, which allows added versatility within applications. The PUZ-HA36NHA unit operates quietly at 51 dB(A) in cooling and 55 dB(A) in heating. In addition, twinning indoor units is possible for the same zone with the H2i outdoor unit by connecting two PKA-A18 indoor units or two PLA-A18 indoor units for maximizing conditioned air distribution in the zone.

In a 2006 field evaluation at a Lake Mills, Wis., church, the Mr. Slim H2i system delivered a discharge temperature of 123 degrees Fahrenheit when the outdoor temperature was just 2 degrees Fahrenheit. The indoor temperature at the time was a comfortable 70 degrees Fahrenheit.

The CITY MULTI VRFZ H2i PUHY-HP-THMU Y-Series outdoor heat pump is available in two capacities, six- and eight-ton or manifolded for 12 and 16 tons. Each system provides distributed capacity to multiple indoor units. CITY MULTI VRFZ H2i systems can connect up to 24 indoor units. The H2i Y-Series outdoor units feature a compact, space-saving design that equates to easier transportation and installation.

Both the Mr. Slim and CITY MULTI H2i systems are available for order now. For more information about the new H2i technology or Mr. Slim and CITY MULTI systems, please visit

About Mitsubishi Electric HVAC Advanced Products Division
For more than 27 years, Mitsubishi Electric HVAC Advanced Products Division, headquartered in Suwanee, Ga., has been a leading marketer of intelligent air-conditioning and heating technology, manufactured by its parent corporation, Mitsubishi Electric. The Division's market distribution includes North America, Latin America, the Caribbean and Bermuda.

Mitsubishi Electric HVAC, an Official Sponsor of the PGA TOUR and Champions Tour, continues to build brand loyalty, increase its market position and deliver exceptional customer service through the Mitsubishi Diamond Alliance™ program. This program is a strategic platform of training-based achievement programs designed to synergize the efforts of Mitsubishi Electric HVAC distributors, contractors and design engineering firms. For more information on the Mitsubishi Diamond Alliance, Mr. Slim® split-ductless cooling and heating systems, CITY MULTI® Variable Refrigerant Flow Zoning (VRFZ) technology, compressors, PlasmaPure™ room air purification systems, a full line of accessories for the Mr. Slim product line, including Line-Hide™ line-set covers and the Mitsubishi Electric HVAC Advanced Products Division, call 800/687-1966 or visit

CITY MULTI installations received Honorable Mention and Runner Up awards in the New Construction category of the 2007 Design/Build Awards Competition sponsored by Contracting Business. Additionally, a 2007 Contracting Business survey named Mitsubishi Electric HVAC as contractors' top preferred brand. A 2006 survey by ACH&R News listed Mitsubishi Electric HVAC as contractors' most preferred ductless manufacturer and the number one brand in price/value, availability, reliability and performance specifications. In 2005, CITY MULTI products were named as one of the top 100 smart products for buildings by Buildings Magazine and received a Bronze Award in the HVAC product category for Consulting Specifying Engineer's Product of the Year contest. In 2004, Mr. Slim products received a Bronze Award in ACH&R News' Dealer Design Awards contest.

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