York ECO R-22 User Manual

Contents

York ECO R-22 User Manual Manual pdf 8 page image

YORK INTERNATIONAL8Application DataLOCATIONOf the many factors that can affect the acoustical char-acteristics of a rooftop installation, one of the most im-portant is the unit location. Ideally, the rooftop unit shouldbe installed away from sound-sensitive areas, such asconference rooms, auditoriums and executive offices.Possible locations could be above storage areas, hall-ways, mechanical or utility rooms, or bathrooms.The eco 2 air conditioning units are designed for out-door installation. When selecting a site for installation,be guided by the following conditions:• Unit must be installed on a level surface.• For the outdoor location of the unit, select a placehaving a minimum sun exposure and an adequatesupply of fresh air for the condenser.• Also avoid locations beneath windows or betweenstructures.• Optional condenser coil protection should be usedfor seashore locations or other harsh environments.• The unit should be installed on a roof that is struc-turally strong enough to support the weight of theunit with a minimum of deflection. It is recom-mended that the unit(s) be installed not more than15 feet from a main support beam to provide properstructural support and to minimize the transmissionof sound and vibration. Ideally, the center of grav-ity should be located over a structural support orbuilding column.• Location of unit(s) should also be away from build-ing flue stacks or exhaust ventilators to prevent pos-sible reintroduction of contaminated air through theoutside air intakes.• Be sure the supporting structures will not obstructthe duct, gas or wiring connections.• Proper service clearance space of 6-feet aroundthe perimeter of the unit, 8-feet on one side for coilservicing, and 12-feet to any adjacent units is re-quired to eliminate cross contamination of exhaustand outdoor air, and for maintenance tasks suchas coil pull and cleaning. No obstructions shouldbe above the condensing unit section.RIGGINGProper rigging and handling of the equipment is man-datory during unloading and setting it into position toretain warranty status.Spreader bars must be used by cranes to prevent dam-age to the unit casing. All lifting lugs must be used whenlifting the rooftop unit. Fork lifts will damage the rooftopunit and are not recommended.Care must be taken to keep the unit in the upright posi-tion during rigging and to prevent damage to the water-tight seams in the unit casing. Avoid unnecessary jar-ring or rough handling.Ground Level LocationsIt is important that the units be installed on a substan-tial base that will not settle, causing strain on the refrig-erant lines and sheet metal and resulting in possibleleaks. A one-piece concrete slab with footers extendedbelow the frost line is highly recommended. Addition-ally, the slab should be isolated from the main buildingfoundation to prevent noise and vibration transmissionto the building structure.For ground level installations, precautions should betaken to protect the unit from tampering by, or injury to,unauthorized persons. Erecting a fence around the unitis common practice.ECONOMIZERThe economizer section is used for ventilation of theconditioned space to maintain indoor air quality, andalso to reduce energy consumption by using outdoorair cooling in lieu of mechanical cooling. If outdoor airis appropriate for cooling, but not sufficient for the cool-ing demand, mechanical cooling will stage on as nec-essary until the cooling load is met.Dual (comparative or differential) enthalpy operation isthe most accurate and efficient means of economizeroperation. The OptiLogic TM control monitors the returnand outside air energy content, and selects the lower ofthe two for operation.VAV SUPPLY AIR PRESSURE CONTROLTraditional packaged rooftop systems use inlet guidevanes (IGVs) for duct static pressure control. These con-trol supply duct pressure by modulating dampers (intro-ducing losses and inefficiencies) on the inlet of the fan,open and closed. YORK’s variable frequency drives(VFDs) offer superior fan speed control and quieter,energy efficient operation.