York YXV series Installation Manual

5284792-UIM-A-03176 Johnson Controls Unitary Products4. Power must be applied to the indoor unit. If installing a coil/furnacematch or multi piece air handler system, the EEV harness must beplugged into the communication port header on furnace or blowercontrol board prior to apply power to the indoor unit. Allow 1 minutefor the EEV to open to allow proper nitrogen flow through the coiland line-set.5. Protect the vapor valve with a wet rag and braze the vapor line con-nection to the outdoor unit. The nitrogen flow should be exiting thesystem from the vapor service port connection. After this connectionhas cooled, remove the nitrogen source from the liquid fitting ser-vice port.6. Braze the liquid line to the evaporator liquid connection. Nitrogenshould be flowing through the evaporator coil.7. Slide the grommet away from the vapor connection at the indoor coiland wrap with a wet rag as shown in Figure 5. Braze the vapor lineto the evaporator vapor connection. After the connection hascooled, slide the grommet back into original position. After this con-nection has cooled, remove the nitrogen source from the liquid fit-ting service port.8. Replace the Schrader core in the liquid and vapor valves.9. Leak test all refrigerant piping connections including the service portflare caps to be sure they are leak tight. DO NOT OVERTIGHTEN(between 40 and 60 inch - lbs. maximum).10. Evacuate the vapor line, evaporator, and liquid line to 500 micronsor less.11. Replace cap on service ports. Do not remove the flare caps from theservice ports except when necessary for servicing the system.12. Release the refrigerant charge into the system. Open both the liquidand vapor valves by removing the service valve cap and with anAllen wrench back out counter-clockwise until valve stem justtouches the chamfered retaining wall. If the service valve is a ballvalve, use a Crescent wrench to turn valve stem one-quarter turncounterclockwise to open. Do not overturn or the valve stem maybreak or become damaged. See “PRECAUTIONS DURING BRAZ-ING SERVICE VALVE”.13. Replace service valve cap finger tight, then tighten an additional 1/2turn (1/2 hex flat). Cap must be replaced to prevent leaks.14. See Section VI “System Charge” section for checking and recordingsystem charge.SECTION IV: EVACUATIONEvacuate the system to 500 microns or less. If a leak is suspected, leaktest with dry nitrogen to locate the leak. Repair the leak and test again.To verify that the system has no leaks, simply close the valve to thevacuum pump suction to isolate the pump and hold the system undervacuum. Watch the micron gauge for a few minutes. If the microngauge indicates a steady and continuous rise, it’s an indication of aleak. If the gauge shows a rise, then levels off after a few minutes andremains fairly constant, it’s an indication that the system is leak free butstill contains moisture and may require further evacuation if the readingis above 500 microns.SECTION V: ELECTRICAL CONNECTIONSGENERAL INFORMATION & GROUNDINGThe control box cover is held in place with 5 screws (one screw neareach lower corner, one each at the midpoint of each side and one at topmiddle).Check the electrical supply to be sure that it meets the values specifiedon the unit nameplate and wiring label.Power wiring, control (low voltage) wiring, disconnect switches and overcurrent protection must be supplied by the installer. Wire size should besized per NEC requirements.The complete connection diagram and schematic wiring label is locatedon the inside surface of the unit service access panel. An example oftypical field connections can be found in Figure 7.FIELD CONNECTIONS POWER WIRING1. Install the proper size weatherproof disconnect switch outdoors andwithin sight of the unit, per local code.2. Remove the screws at the top and sides of the corner cover. Slidethe control box cover down and remove from unit.3. Run power wiring from the disconnect switch to the unit.4. Route wires from disconnect through power wiring exit provided andinto the unit control box as shown in Figure 1 and view the openingsin Figure 6.5. Make the power supply connections to the supplied terminal block.CAUTIONDo not install any coil with a furnace which is to be operated duringthe heating season without attaching the refrigerant lines to the coil.The coil is under pressure which must be released to prevent exces-sive pressure build-up and possible coil damage.NOTICELine set and indoor coil can be pressurized to 250 psig with dry nitro-gen and leak tested with a bubble type leak detector. Then releasethe nitrogen charge.Do not use the system refrigerant in the outdoor unit to purge or leaktest.CAUTIONDo not connect manifold gauges unless trouble is suspected. Approx-imately 3/4 ounce of refrigerant will be lost each time a standard man-ifold gauge is connected.!!WARNINGNever attempt to repair any brazed connections while the system isunder pressure. Personal injury could result.CAUTIONAll field wiring must USE COPPER CONDUCTORS ONLY and be inaccordance with Local, National, Fire, Safety & Electrical Codes. Thisunit must be grounded with a separate ground wire in accordancewith the above codes.!!