Wording for ARI Certified Wheels, Options and Accessories
ARI Certified Energy Recovery Wheels
Wheel shall be of the enthalpy type for both sensible and latent heat recovery and be designed to insure laminar flow. Energy transfer ratings must be ARI Certified to Standard 1060 and bear the ARI certification symbol for ARI Air-to-Air Energy Recovery Ventilation Equipment Certification Program based on ARI 1060. Ratings "in accordance with 1060" without certification are not acceptable. Desiccant shall be silica gel for maximum latent energy transfer. Wheel shall be constructed of lightweight polymer media to minimize shaft and bearing loads. Polymer media shall be mounted in a stainless steel rotor for corrosion resistance.
Wheel design shall consist of removable segments (on diameters 36 inches and greater) for ease of service and/or cleaning. Silica gel desiccant shall be permanently bonded to wheel media to retain latent heat capability after cleaning. Wheels with sprayed on desiccant coatings are not acceptable. Wheels with desiccant applied after wheel formation are not acceptable. Energy recovery device shall transfer moisture entirely in the vapor phase.
Energy recovery drive belt material shall be high strength urethane and shall be factory installed in a pre-stretched state, eliminating the need for field belt tension adjustment. Link style belts are not acceptable.
ERT with Wrap Around Heat Pipe for Neutral Temperature Applications
Dehumidifier heat pipe shall precool the air leaving the wheel and reheat the air leaving the cooling coil in a wrap around configuration. Both heat exchangers shall be inside and integral to the equipment cabinet.
Coils shall have copper tubes with permanently expanded aluminum fins, 12 fpi or less. Heat transfer fluid shall be classified as Safety Group A1 in BDR/ASHRAE Std. 15- 1989R.
Gas Heat Option with ERH and ERCH
Indirect fired gas furnace shall be 80% efficient, UL Listed for indoor and outdoor installation to ANSI Standard Z83.8 - 2002, CGA approved per 2.6 - 2002 and have a blow through fan design. Furnace shall be capable of operation with natural gas or LP gas and have a power venting system. The burner and heat exchanger shall be constructed of aluminized steel. Standard furnace features shall include main gas pressure regulator, main gas valve, electronic staged or electronic modulating controls, direct spark ignition system, high limit and a 24-volt control transformer.
Night Setback Option with ERCH
Night setback damper shall allow air recirculation during unoccupied hours. Night setback damper shall be located in the divider between the supply and exhaust airstreams after the energy recovery wheel and before the tempering coils. Night setback damper shall be of low leakage design with thermally insulated airfoil blades, stainless steel jamb seals, and extruded silicone rubber blade seals.
Modulating Energy Recovery Wheel
Energy recovery wheel shall be supplied with a fully factory programmed variable frequency drive. Outdoor air and return air sensors shall trigger wheel modulation for economizer mode. Outdoor air sensor and wheel pressure drop sensor shall trigger wheel modulation for frost control mode. Wheel shall modulate to target a discharge temperature of 55?F during economizer. Wheel shall modulate during frost control to eliminate frost.
Real Time Frost Control
Frost control shall be triggered by an outdoor air temperature sensor AND a wheel pressure drop sensor. Both sensors are to be satisfied to employ frost control. Frost control strategies employed via outdoor air temperature sensor only are not acceptable.
Demand Control Ventilation
Demand control ventilation shall be triggered by a factory supplied carbon dioxide sensor monitoring CO2 levels in the space. The CO2 sensor shall provide unit on-off control, blower low speed ? high speed control, or blower modulation control. CO2 sensor shall be factory preset and field adjustable.