York YAFS012 Installation Manual

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York YAFS012 Installation Manual Manual pdf 10 page image

10Figure 7: Closed Loop Ground Source ApplicationNOTE: For closed loop systems with antifreeze protection, setSW2-1 to the “LOOP” (15°F) position. (Refer to the DIP SwitchSettings table in the Aurora Control section.)Once piping is completed between the unit, pumps and the groundloop (see figure below), final purging and charging of the loop isrequired. A flush cart (or a 1.5 HP pump minimum) is needed toachieve adequate flow velocity in the loop to purge air and dirtparticles from the loop itself. Antifreeze solution is used in mostareas to prevent freezing. Flush the system adequately to removeas much air as possible then pressurize the loop to a static pressureof 40-50 psi (summer) or 50-75 psi (winter). This is normallyadequate for good system operation. Loop static pressure willfluctuate with the seasons. Pressures will be higher in the wintermonths than during the cooling season. This fluctuation is normaland should be considered when initially charging the system.After pressurization, be sure to turn the venting (burping) screw in thecenter of the pump two (2) turns open (water will drip out), wait untilall air is purged from the pump, then tighten the plug. Ensure that theloop pumps provide adequate flow through the unit(s) by checking thepressure drop across the heat exchanger and comparing it to the unitcapacity data in this catalog. 2.5 to 3 gpm of flow per ton of coolingcapacity is recommended in earth loop applications.NOTE: Additional information can be found in Flow Centerinstallation manual and Flush Cart manual.Closed Loop Ground Source SystemsFigure 8b: Primary/Secondary Hook-upFigure 8a: Primary/Secondary Wiring with Aurora BaseControl (no AXB Board)CCT2 T1CompressorCRSBlueL1L2BlackRedTan(6)CapExt Pump1/2 hp Total208-230/60/1PumpG12PB112PumpCircuitBreakerCircuitBreaker15A5AOptional InternalHWG PumpHWGPumpPurpleHot WaterLimit Switch130°FBlue1 23CabinetHW SwitchField SuppliedRelay for HeatPump 1Field SuppliedRelay for HeatPump 2Heat Pump 1Contactor CoilHeat Pump 2Contactor CoilField SuppliedFuses 5AMultiple Units on One Flow CenterNOTE: This feature is only available in the Aurora AdvancedControl package (AXB board), NOT the Aurora Base Control (ABC).When two units are connected to one loop pumping system, pumpcontrol is automatically achieved by connecting the SL terminals onconnector P2 in both units with 2-wire thermostat wire. These terminalsare polarity dependant (see Figure 8b). The loop pump(s) may bepowered from either unit, whichever is more convenient. If either unitcalls, the loop pump(s) will automatically start. The use of two units onone flow center is generally limited to a total of 20 gpm capacity.NOTE: To achieve this same feature when heat pumps have onlythe Aurora Base Control, follow Figure 8a. Installer will be requiredto supply fuses, two relays, and wiring.Variable Speed Pump SetupWhen using a variable speed pump flow center (FCV1-GL, FCV2-GL, FCV1-GLNP, or FCV2-GLNP) the use of an AID Tool will benecessary to adjust minimum and maximum flow rates. The factorydefault is: minimum=75% and maximum=100% speed levels.Flexible DuctCollarVibration Absorbing PadP/T PlugsDrainDesuperheaterConnectionsAuxiliaryHeaterKnockoutLowVoltage toThermostatUnit SupplyAuxiliary HeatSupplyInsulated pipingor hose kitDisconnects(If Applicable)Unit PowerP/TTOLOOPGeoLink ®FlowCenterGeoLink®Polyethylene w/Armaflex®InsulationAFFINITY SINGLE & DUAL CAPACITY SERIES INSTALLATION MANUALAffinity Series toElectromechanical UnitsTo Electromechanical UnitAffinity YAFV Series Unit #1with AXB BoardAffiniy Series Unit #1with AXB BoardAffinity YAFS/T or Affinity YAFV SeriesUnit #2 with AXB BoardAffinity YAFV Series to otherAffinity YAFV or Affinity YAFS/TSeries UnitsC SVSSLOSLIOUTIN C CVSSLOSLIOUTIN C CWith pumpwired toUnit 2With pumpwired to Unit 1VSSLOSLIOUTIN C C