York R-410A Installation Manual

Contents

66901 / 035-20393-001 Rev. C (1204)Unitary Products Group 3GROUND INSTALLATIONThe unit may be installed at ground level on a solid base that will notshift or settle, causing strain on the refrigerant lines and possible leaks.Maintain the clearances shown in Figure 1 and install the unit in a levelposition.Normal operating sound levels may be objectionable if the unit is placeddirectly under windows of certain rooms (bedrooms, study, etc.).Isolate the unit from rain gutters to avoid any possible wash out of thefoundation.ROOF INSTALLATIONWhen installing units on a roof, the structure must be capable of sup-porting the total weight of the unit, including a pad, lintels, rails, etc.,which should be used to minimize the transmission of sound or vibra-tion into the conditioned space.UNIT PLACEMENT1. Provide a base in the pre-determined location.2. Remove the shipping carton and inspect for possible damage.3. Compressor tie-down bolts should remain tightened.4. Position the unit on the base provided.LIQUID LINE FILTER-DRIERThe air conditioning unit’s copper spun bi-flow filter/dryer is located onthe liquid line.NOTE: Replacements for the liquid line drier must be exactly the sameas marked on the original factory drier. See Source 1 for O.E.M.replacement driers.PIPING CONNECTIONSThe outdoor condensing unit must be connected to the indoor evapora-tor coil using field supplied refrigerant grade copper tubing that is inter-nally clean and dry. Units should be installed only with the tubing sizesfor approved system combinations as specified in tabular data sheet.The charge given is applicable for total tubing lengths up to 15 feet. SeeApplication Data Part Number 036-61920-000 for installing tubing oflonger lengths and elevation differences.NOTE: Using a larger than specified line size could result in oil returnproblems. Using too small a line will result in loss of capacityand other problems caused by insufficient refrigerant flow. Slopehorizontal vapor lines at least 1" every 20 feet toward the out-door unit to facilitate proper oil return.PRECAUTIONS DURING LINE INSTALLATION1. Install the lines with as few bends as possible. Care must be takennot to damage the couplings or kink the tubing. Use clean harddrawn copper tubing where no appreciable amount of bendingaround obstruction is necessary. If soft copper must be used, caremust be taken to avoid sharp bends which may cause a restriction.2. The lines should be installed so that they will not obstruct serviceaccess to the coil, air handling system, or filter.3. Care must also be taken to isolate the refrigerant lines to minimizenoise transmission from the equipment to the structure.4. The vapor line must be insulated with a minimum of 1/2" foam rub-ber insulation (Armaflex or equivalent). Liquid lines that will beexposed to direct sunlight and/or high temperatures must also beinsulated.Tape and suspend the refrigerant lines as shown. DO NOT allow tubemetal-to-metal contact. See Figure 2.5. Use PVC piping as a conduit for all underground installations asshown in Figure 3. Buried lines should be kept as short as possibleto minimize the build up of liquid refrigerant in the vapor line duringlong periods of shutdown6. Pack fiberglass insulation and a sealing material such as perma-gum around refrigerant lines where they penetrate a wall to reducevibration and to retain some flexibility.7. See application part number 036-61920-000 for additional pipinginformation.PRECAUTIONS DURING BRAZING OF LINESAll outdoor unit and evaporator coil connections are copper-to-copperand should be brazed with a phosphorous-copper alloy material suchas Silfos-5 or equivalent. DO NOT use soft solder. The outdoor unitshave reusable service valves on both the liquid and vapor connections.The total system refrigerant charge is retained within the outdoor unitduring shipping and installation. The reusable service valves are pro-vided to evacuate and charge per this instruction.Serious service problems can be avoided by taking adequate precau-tions to ensure an internally clean and dry system.Failure to do so or using a substitute drier or a granular type mayresult in damage to the equipment.Filter-DrierSource 1 Part No.Apply with ModelsCZE / AC5B / AL5B029-22195-000 AllThis system uses R-410A refrigerant which operates at higher pres-sures than R-22. No other refrigerant may be used in this system.Gauge sets, hoses, refrigerant containers, and recovery systemsmust be designed to handle R-410A. If you are unsure, consult theequipment manufacturer.Never install a suction-line filter drier in the liquid line of an R-410Asystem. Failure to follow this warning can cause a fire, injury ordeath.FIGURE 2: Tubing HangerFIGURE 3: Underground InstallationLiquidLineIncorrectCorrect TapeSheet Metal HangerInsulated Vapor LineTO INDOOR COIL TO OUTDOOR UNITLIQUID LINECAPPVCCONDUITINSULATEDVAPOR LINE