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Johnson Air-Rotation Systems For over 80 years, Johnson has been providing HVAC solutions for warehouses, distribution centers, manufacturing facilities and The ERV incorporates a rotating heat exchange wheel and a pair of exhaust blowers. It exhausts return air through the wheel, capturing the thermal energy ofMANUAL FOR IFJ AIR TURNOVER UNITS FOR SMALL BUILDINGS WARNING: Improper installation, adjustment, alteration, service or maintenance can. Founded in 1921, Johnson Air-Rotation Systems set the bar by creating a new for easy maintenance of coils, fans and motors; Automatic and Manual High This manual provides common descriptions, basic and advanced information to maintain and service this inverter-driven (cooling or heat pump) air conditioning HTS is committed to the individual success of all those involved in a project's HVAC system selection, design, purchase, installation and maintenance. Need General Specifications for all of our Johnson Air-Rotation units. Ground mounted coils and filters for easy maintenance and cleaning. This system streamlining makes Air-Rotation the most cost effective way to address these large areas. MAINTENANCE REDUCTION: These grade mounted, vertical air