Carrier 50YDV Installation, Operation And Maintenance Instructions

Carrier 50YDV Installation, Operation And Maintenance Instructions Manual pdf 23 page image

23R e s i d e n t i a l P a c k a g e d U n i t s - 6 0 H z P u r o n ®R e v. : 4 J a n . , 2 0 1 2Electrical - Thermostat WiringFigure 24: Units With Optional ECM Fan.Figure 25: Typical Thermostat 2 Heat/1 Cool (PSC Fan)Thermostat InstallationThe thermostat should be located on an interior wall in alarger room, away from supply duct drafts. DO NOT locatethe thermostat in areas subject to sunlight, drafts or onexternal walls. The wire access hole behind the thermostatmay in certain cases need to be sealed to prevent erroneoustemperature measurement. Position the thermostat backplate against the wall so that it appears level and so thethermostat wires protrude through the middle of the backplate. Mark the position of the back plate mounting holesand drill holes with a 3/16” (5mm) bit. Install suppliedanchors and secure plate to the wall. Thermostat wire mustbe 18 AWG wire. Wire the appropriate thermostat as shownin Figures 24 and 25 to the low voltage terminal strip on theCXM (units with PSC motor) or ECM control board (unitswith ECM motor). Practically any heat pump thermostat willwork with these units, provided it has the correct number ofheating and cooling stages.ATM21U01 ThermostatConnection to CXM ControlCompressorHeating Stage 2Reversing ValveFan24Vac Hot24Vac CommonFault LEDYY2/WOGRCLYWOGRCAL1CXMNOTICE: Units with Whole House Dehumidification wholehouse dehumidification option require a separate humidistator thermostat part number ATP32U04 (See Whole HouseDehumidification AOM for more details).ATP32U04 ThermostatConnection to ECM ControlCompressorCompressor Stage 2Reversing ValveFan24Vac Hot24Vac CommonFault LEDECMBoardY1Y2WDHOGRCAL1Y1Y2WDHOGRCLDehumidificationUnits with CXM or DXM board and ECM fan motor, utilizing ECM dehumidificationmode (without ClimaDry option)Notes:1) Units with whole house dehumidification option have slightly differentthermostat wiring.Terminal DH at the thermostat is connected to terminal H atthe DXM board2) ECM dehumidification mode slows down fan speed in the cooling mode whendehumidification output from thermostat is active. Normal heating and cooling fanspeeds are not affected.3) ECM board DIP switch SW9 must be in dehumid. mode forECM dehumidification mode.Auxiliary Heat6ѥ CAUTION! ѥCAUTION! Many units installed with a factory or fieldsupplied manual or electric shut-off valve. DAMAGE WILLOCCUR if shut-off valve is closed during unit operation. Ahigh pressure switch must be installed on the heat pumpside of any field provided shut-off valves and connected tothe heat pump controls in series with the built-in refrigerantcircuit high pressure switch to disable compressoroperation if water pressure exceeds pressure switch setting.The field installed high pressure switch shall have a cut-outpressure of 300 psig and a cut-in pressure of 250 psig. Thispressure switch can be ordered with a 1/4” internal flareconnection as part number 39B0005N02.ѥ CAUTION! ѥCAUTION! Refrigerant pressure activated water regulatingvalves should never be used with this equipment.