Specifications
General: Heating and Ventilating unit shall be as manufactured by Greenheck or approved equal provided all specifications are met. Greenheck Model
Furnace: Indirect gas fired furnace shall be 80% efficient, ETL Listed and have a blow through fan design. Furnace shall be capable of operation with Natural or LP gas and have a power venting system with post purge cycle. The heat exchanger shall be constructed of aluminized steel or stainless steel. Standard furnace features shall include main gas pressure regulator, main gas valve, electronic staged controls, direct spark ignition system, high limit and a 24 volt control transformer. Furnace shall be insulated and have double wall construction.
Temperature Control: Heating and cooling output shall be controlled by a room thermostat to maintain desired room temperature. Economizer control shall provide the first stage of cooling, where specified. Furnaces shall provide one or two stages of heat output control.
Unit Casing and Frames: All frames and panels shall be G90 galvanized steel. Where top panels are joined there shall be a standing seam to insure positive weather protection. All
Insulation: Models provided with a mixing box shall be insulated from the return section through to the supply discharge. Insulation shall be in accordance with NFPA 90A and tested to meet UL 181 erosion requirements. Double wall shall be provided if specified.
Fan Section: Centrifugal fans shall be double width, double inlet. Fan and motor shall be mounted on a common base and shall be internally isolated. All blower wheels shall be statically and dynamically balanced. Ground and polished steel fan shafts shall be mounted in permanently lubricated ball bearings (up to size 118) or ball bearing pillow blocks (size 120 and larger). Bearings shall be selected for a minimum (L10) life in excess of 100,000 hours at maximum cataloged speeds.
Motors and Drives: Motors shall be energy efficient, complying with EPACT standards, for single speed ODP and TE enclosures. Motors shall be permanently lubricated, heavy duty type, matched to the fan load and furnished at the specified voltage, phase and enclosure. Drives shall be sized for a minimum of 150% of driven horsepower. Pulleys shall be cast and have machined surfaces, 10 horsepower and less shall be supplied with an adjustable drive pulley.
Electrical: All internal electrical components shall be prewired for single point power connection. All electrical components shall be UL listed, recognized or classified where applicable and wired in compliance with the National Electrical Code. Control center shall include motor starter, control circuit fusing, control transformer for 24 VAC circuit, integral disconnect switch with separate motor fusing and terminal strip. Contactors, Class 20 adjustable overload protection and single phase protection shall be standard.
Filter Section: Filters shall be mounted in a
do not exceed 550 feet per minute. Filters shall be easily accessible through a removable access panel.
Weatherhood: Weatherhood shall be mist eliminating type, constructed of G90 galvanized steel. The weatherhood shall contain drainable blade louvers, backed by mist eliminating filters to prevent moisture intake.
Mixing Box: Mixing box shall contain outside air and return air dampers with low leak, pressure activated, extruded vinyl blade seals, aluminum jamb seals, Belimo actuator and 30% efficient pleated filters in a
Evaporative Cooling Section: Evaporative cooling section shall include a galvanized steel housing with louvered intake, two inch aluminum mesh filters and a stainless steel evaporative cooling module all provided by the
Cooling Coil: Direct expansion (DX) or chilled water coil shall be factory tested and rated in accordance with ARI 410. Coils shall have copper tubes with permanently expanded aluminum fins, 12 fpi or less. DX coils shall be equipped with distributors to receive expansion valves at the liquid connections. Drain pans shall extend at least 12 inches downstream of coil and be sloped to drain connection.
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