York YAZS022 Installation Manual

York YAZS022 Installation Manual Manual pdf 28 page image

28The indoor split series comes with a holding charge. The chargemust be adjusted in the field based on performance. Refrigerationpiping on the split consists of installing a brazed copper lineset between the blower coil unit and the unit’s split compressorsection. To select the proper tube diameters for the installation,refer to the Line Set Sizes table. Line sets over 60 feet long are notrecommended because of oil return and pressure drop problems.The suction line must always be insulated. Handle and route theline sets carefully to avoid kinking or bending the tubes. If the lineset is kinked or distorted and it cannot be formed back into itsoriginal shape, the bad portion of the pipe should be replaced. Arestricted line set will affect the performance of the system.Fasten the copper line set to the blower coil unit as instructedby the coil installation instructions shown in Figure 14. Nitrogenshould be bled through the system at 2 to 3 PSI to preventoxidation inside the refrigerant tubing. Use a low silver phos-copper braze alloy on all brazed connections.RefrigerationReplace caps afteropening systemService ports forattaching refrigerantgauges InsulatedSuction LineBrazeConnectionLiquidLineccwccwFigure 13: Typical Split System Refrigerant Line ConnectionsPosition Description System ServicePortCW - Full In Shipping Position Closed OpenCCW - Full Out 1/2 turn CW Service Position Open OpenCCW - Full Out Operation Position Open ClosedTXV ("IN" toward condensing unit)Equalizer BulbSuctionLiquidTXV has internal check valveFigure 14: Attaching the Air CoilThe indoor split service valves are recessed in the unit’s corner postand protected by a cover. Remove the protective cover and brazethe line set to the service valve stubs as shown in Figure 13. Careshould be used when brazing the service valves as to not scorch thepaint. Nitrogen should be bled through the system at 2 to 3 psi toprevent oxidation contamination. Use a low silver phos-copper brazealloy on all brazed connections. Indoor split units are shipped with afactory charge and service valves are not to be opened until the lineset has been leak tested, purged, and evacuated. Schrader coresshould be removed before brazing, and replaced after the valveshave cooled. A heat sink should be used on the service valve andTXV to prevent damage caused by excessive heat. When brazing iscompleted, reinstall the protective cover.AFFINITY INDOOR SPLIT SERIES INSTALLATION MANUAL