Trane Mechanical Specifications, Q FAN ASSEMBLY Housing, Inlet/Outlet Shells, Fan Wheel, Shaft

Mechanical Specifications

Q FAN ASSEMBLY

Housing

Housings are 14-gauge steel hydraulically expanded to form integral inlet bell and diffuser sections. Hydraulically expanded stiffening ring welded in area of wheel raceway. On VAV variable speed fan units, fan inlet supports are structurally reinforced to handle extra stresses of variable speed fan modulation and fan is balanced at ten different fan speeds over the desired operating range.

Inlet/Outlet Shells

Fan has tapered inlet and outlet shells over fan hub assembly. Shells uniformly accelerate air through blade area. End bell covers fan drive assembly, thereby reducing flow turbulence. Eight fan blades are precision aluminum casting with airfoil cross sections. Blade to shell clearance is in the range of 30 mils.

Fan Wheel

Fans size 16-44 have fan wheel of precision aluminum casting with eight radially projected blades with air-foil cross sections.

Fans size 49-60 have fan wheel of sixteen precision cast and machined aluminum blades mounted on a steel wheel plate.

All wheels are dynamically balanced and keyed to fan shaft.

Diffuser

Cast aluminum diffuser with 29 radially projected straightening vanes with airfoil cross sections. Leading edge of vanes are curved to reduce tone noise generation. Clips on almost every other vane eliminate harmonic ring potential.

Shaft

Solid AISI-C1040 hot-rolled steel, turned and polished. Close tolerances maintained where shaft makes contact with bearings.

Bearings

Precision, flange-mounted, self-aligning ball bearings at inlet and discharge. Bearings on all sizes are grease lubricated and selected for a minimum average life (AFBMA L-50) in excess of 200,000 hours at maximum cataloged operating conditions. Bearing greaselines are extended out through fan shell for easy servicing.

Drives

Mechanical drives are computer selected for low noise, low maintenance operation. Center distance and arc of contact is maintained within prefixed limits. Constant speed fans use variable or constant pitch drives; variable speed modulated fans use fixed drives only.

SUPER QUIET II FANS

Trane Super Quiet II (SQ2) fans include fan housing, wheel, shaft, bearings, diffuser section, motor mounting support, ODP standard or high efficiency motor, drives, spring isolation in acoustically-treated casing in a factory-assembled unit. Fan motors are outside of airstream.

Constant volume units (SQ2C) are equipped with variable or constant pitch drives. Variable air volume units (SQ2V) use adjustable frequency inverters for fan capacity modulation and must have constant pitch drives. Inlet vanes are NOT available for Super Q II fans.

ENCLOSURE

Fans are internally isolated on four height saving spring isolators and then flex connected inside of an airtight acoustical enclosure. Walls are

16-gauge steel, internally lined with two-inch thick three-pound per square foot density fiberglass. Airside surface of acoustical lining is coated with black matte faced lining to prevent scuffing.

Enclosure has two large full size

side access panels. Access panels are fully gasketed and mechanically attached to casing for easy removal. Enclosure has access panel positioning feet to insure easy access panel replacement after removal.

Duct connections in enclosure end panels slip connect to standard U.S. round duct sizes.

Fan grease lines are extended through enclosure for easy servicing of fan. Optional fan motor leads are extended through casing for easier installation.

Two rails support the entire enclosure. Rails can be rested on floor or hung from the ceiling with steel rods. Ducts can be directly connected to enclosure since fan is internally isolated.

Enclosure is rated for four-inch negative or five-inch positive pressure.

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