York R-410A Installation Manual

Contents

66901 / 035-20393-001 Rev. C (1204)2 Unitary Products GroupRequirements For Installing/Servicing R-410A Equipment• Gauge sets, hoses, refrigerant containers, and recovery systemsmust be designed to handle the POE type oils and the higherpressures of R-410A.• Manifold sets should be 800 PSIG high side and 250 PSIG lowside with 550 PSIG low side retard.• All hoses must have a 700 PSIG service pressure rating.• Leak detectors should be designed to detect HFC refrigerant.• Recovery equipment (including refrigerant recovery containers)must be specifically designed to handle R-410A.• Do not use an R-22 TXV.• A liquid-line filter drier is required on every unit.LIMITATIONSThe unit should be installed in accordance with all National, State, andLocal Safety Codes and the limitations listed below:1. Limitations for the indoor unit, coil, and appropriate accessoriesmust also be observed.2. Only variable speed air handlers or variable speed furnacesshould be used with these models.3. The outdoor unit must not be installed with any duct work in the airstream. The outdoor fan is the propeller type and is not designedto operate against any additional external static pressure.4. The maximum and minimum conditions for operation must beobserved to ensure a system that will give maximum performancewith minimum service.5. The unit should not be operated at outdoor temperatures below60° F without an approved low ambient operation accessory kitinstalled.6. The maximum allowable line length for this product is 75 feet.7. Indoor evaporator coil orifice must be removed prior to the instal-lation of a factory supplied balanced port TXV kit.SECTION III: UNIT INSTALLATIONLOCATIONBefore starting the installation, select and check the suitability of thelocation for both the indoor and outdoor unit. Observe all limitations andclearance requirements.The outdoor unit must have sufficient clearance for air entrance to thecondenser coil, for air discharge, and for service access. See Figure 1.NOTE: For multiple unit installations, units must be spaced a minimumof 18 inches apart. (coil face to coil face.)If the unit is to be installed on a hot sun exposed roof or a black-toppedground area, the unit should be raised sufficiently above the roof orground to avoid taking the accumulated layer of hot air into the outdoorunit.Provide an adequate structural support.ADD-ON REPLACEMENT/RETROFITWhen this unit is being used as a replacement for an R-22 unit, it isrequired that the outdoor unit, indoor coil, and metering device all bereplaced. Line-set change out is also recommended. The followingsteps should be performed in order to insure proper system operationand performance.1. Change-out of the indoor coil to an approved R-410A coil with theappropriate metering device.2. Change-out of the line-set when replacing an R-22 unit with anR-410A unit is highly recommended to reduce cross-contamina-tion of oils and refrigerants.3. If change-out of the line set is not practical, then the following pre-cautions should be taken.• Inspect the line set for kinks, sharp bends, or other restrictions,and for corrosion.• Determine if there are any low spots which might be serving as oiltraps.• Flush the line set with a commercially available flush kit toremove as much of the existing oil and contaminants as possible.• Install a suction line filter-drier to trap any remaining contami-nants, and remove after 50 hours of operation.4. If the outdoor unit is being replaced due to a compressor burnout,then installation of a 100% activated alumina suction-line filterdrier is required, in addition to the factory installed liquid-line drier.Operate the system for 10 hours. Monitor the suction drier pres-sure drop. If the pressure drop exceeds 3 psig, replace both thesuction-line and liquid-line driers. After a total of 10 hours run timewhere the suction-line pressure drop has not exceeded 3 psig,replace the liquid line drier, and remove the suction-line drier.Never leave a suction-line drier in the system longer than 50 hoursof run time.FIGURE 1: Typical InstallationTHERMOSTATNEC CLASS 1WIRINGTO INDOORBLOWER NEC CLASS 2WIRINGTO COILWEATHERPROOFDISCONNECT SWITCH48” OVERHEADCLEARANCE24” SERVICEACCESSCLEARANCE18” FRONT& SIDESNOTE: ALL OUTDOOR WIRING MUST BE WEATHERPROOFSEAL OPENINGS WITHPERMAGUM OR EQUIVALENT