Laserfiche WebLink
Quanunit fity ag:1I /granivw I A <br /> : <br /> Casing <br /> Unit casing shall be constructed of zinc coated, heavy gauge, galvanized steel. Exterior surfaces shall <br /> be cleaned, phosphatized, and finished with a weather-resistant baked enamel finish. Unit's surface <br /> shall be tested 672 hours in a salt spray test in compliance with ASTM B117. Cabinet construction <br /> shall allow for all maintenance on one side of the unit. Service panels shall have lifting handles and be <br /> removed and reinstalled by removing two fasteners while providing a water and air tight seal. All <br /> exposed vertical panels and top covers in the indoor air section shall be insulated with a cleanable foil- <br /> faced, fire-retardant permanent, odorless glass fiber material. The base of the unit shall be insulated <br /> with 1/8 inch, foil-faced, closed-cell insulation. All insulation edges shall be either captured or sealed. <br /> The unit's base pan shall have no penetrations within the perimeter of the curb other than the raised 1 <br /> 1/8 inch high downflow supply/return openings to provide an added water integrity precaution, if the <br /> condensate drain backs up. The base of the unit shall have provisions for forklift and crane lifting, with <br /> forklift capabilities on three sides of the unit. <br /> Unit Top <br /> The top cover shall be one piece construction or, where seams exist, it shall be double-hemmed and <br /> gasket-sealed. The ribbed top adds extra strength and enhances water removal from unit top. <br /> Filters <br /> Throwaway filters shall be standard on all units. Optional 2-inch MERV 8 and MERV 13 filters shall <br /> also be available. <br /> Indoor Fan <br /> The following units shall be equipped with a direct drive plenum fan design (T/YSC120F,T/YHC074F, <br /> T/YHC092F,T/YHC102F, 120F). Plenum fan design shall include a backward-curved fan wheel along <br /> with an external rotor direct drive variable speed indoor motor. All plenum fan designs will have a <br /> variable speed adjustment potentiometer located in the control box. <br /> 3 to 5 ton units (high efficiency 3-phase with optional motor) are belt driven, FC centrifugal fans with <br /> adjustable motor sheaves. 3 to 5 ton units (standard and high efficiency 3-phase) have multispeed, <br /> direct drive motors. All 6 to 81/2 ton units (standard efficiency) shall have belt drive motors with an <br /> adjustable idler-arm assembly for quick-adjustment to fan belts and motor sheaves. All motors shall be <br /> thermally protected. All 10 tons, 6 ton (074), 71/2 to 81/2 (high efficiency) units have variable speed <br /> direct drive motors. All indoor fan motors meet the U.S. Energy Policy Act of 1992 (EPACT). <br /> Outdoor Fans <br /> The outdoor fan shall be direct-drive, statically and dynamically balanced, draw-through in the vertical <br /> discharge position. The fan motor shall be permanently lubricated and shall have built-in thermal <br /> overload protection. <br /> Multi-Speed Indoor Fan System <br /> Multi-speed indoor fan system is designed for use in applications for meeting the minimum <br /> requirement of CA Title 24. This system incorporates a multi-speed fan control to change the speed of <br /> the fan to 67% of full airflow based off of compressor stages. <br /> Evaporator and Condenser Coils <br /> Internally finned, 5/16" copper tubes mechanically bonded to a configured aluminum plate fin shall be <br /> standard. Evaporator coils are standard for all 3 to 10 ton standard efficiency models. Microchannel <br /> condenser coils are standard for all 3 to 10 ton standard efficiency models and 4, 5, 6, 7.5, 8.5 ton high <br /> efficiency models. The microchannel type condenser coil is not offered on the 4 and 5 ton <br /> dehumidification model. Due to flat streamlined tubes with small ports, and metallurgical tube-to-fin <br /> bond, microchannel coil has better heat transfer performance. Microchannel condenser coil can <br /> reduce system refrigerant charge by up to 50% because of smaller internal volume, which leads to <br /> better compressor reliability. Compact all-aluminum microchannel coils also help to reduce the unit <br /> weight. These all aluminum coils are recyclable. Galvanic corrosion is also minimized due to all <br /> aluminum construction. Strong aluminum brazed structure provides better fin protection. In addition, <br /> flat streamlined tubes also make microchannel coils more dust resistant and easier to clean. Coils <br /> 2017-09-18 15:17:53Z Page 8 of 9 <br />