York ECO R-407C User Manual

FORM 100.50-EG19YORK INTERNATIONALApplication 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. Extreme cautionshould be taken when the unit is mounted on a woodstructured roof. It is recommended that the unit(s)be installed not more than 15 feet from a main sup-port beam to provide proper structural support andto minimize the transmission of sound and vibra-tion. Ideally, the center of gravity should be locatedover a structural support or building 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 and 12-feet to any adja-cent units is required to eliminate cross contami-nation of exhaust and outdoor air, and for mainte-nance tasks such as coil pull and cleaning. No ob-structions should be above the condensing unitsection.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 to prevent damage to theunit casing. All lifting lugs must be used when lifting therooftop unit.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 not be tied to the main buildingfoundation as noises may be transmitted into the build-ing 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 another 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.Comparative enthalpy operation is the most accurate andefficient means of economizer operation. The OptiLogicTMcontrol monitors the return and outside air energy con-tent, and selects the lower of the 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 intlet of the fan,open and closed. Variable frequency drives (VFDs) of-fer superior fan speed control and quieter, energy effi-cient operation.IGV inefficiency can be compared to the operation of acar. Modulating air flow with an IGV is like pressing onthe gas to drive the car, but modulating the speed of thecar by simultaneously pressing on the brake. VFD modu-lation is speed modulation by using just the gas pedal.