Carrier 50TCQD14 Installation Instructions Manual

Also see for 50TCQD: Installation instructions

Contents

7C DABC09897BLOCATION DIMENSION CONDITIONA48--- in (1219 mm)18--- in (457 mm)18--- in (457 mm)12--- in (305 mm)Unit disconnect is mounted on panelNo disconnect, convenience outlet optionRecommended service clearanceMinimum clearanceB42--- in (1067 mm)36--- in (914 mm)SpecialSurface behind servicer is grounded (e.g., metal, masonry wall)Surface behind servicer is electrically non--- conductive (e.g., wood, fiberglass)Check sources of flue products within 10--- ft of unit fresh air intake hoodC 36--- in (914 mm)18--- in (457 mm)Side condensate drain is usedMinimum clearanceD 42--- in (1067 mm)36--- in (914 mm)Surface behind servicer is grounded (e.g., metal, masonry wall, another unit)Surface behind servicer is electrically non--- conductive (e.g., wood, fiberglass)NOTE: Unit not designed to have overhead obstruction. Contact Application Engineering for guidance on any applicationplanning overhead obstruction or for vertical clearances.Fig. 3 -- Service Clearance Dimensional DrawingREFRIGERATION SYSTEMCOMPONENTSEach heat pump refrigeration system includes acompressor, accumulator, reversing valve, dual--functionoutdoor coil with vapor header check valve, cooling liquidline with a filter drier and a check valve, dual--functionindoor coil with a vapor header check valve, and heatingliquid line with a check valve and a strainer. Size 14 unitshave two compressor--circuits. See Fig. 4 for typical unitpiping schematic (4--row indoor coil with twocompressor--circuits is shown).Dual--function outdoor and indoor coils are designed toprovide parallel coil circuits during evaporator--functionoperation and converging coil circuits during thecondenser--function operation.Reversing Valve and Check Valve PositionSee Fig. 4 (on page 8) and Tables 1 -- 3.Troubleshooting Refrigerant Pressure Problems andCheck ValvesRefer to Fig. 4 and the Cooling Mode and Heating Modetables (Tables 1 and 2).Refrigerant System Pressure Access PortsThere are two access ports in each circuit -- on the suctiontube and the discharge tube near the compressor. These arebrass fittings with black plastic caps. The hose connectionfittings are standard 1/4 --inch SAE male flare couplings.The brass fittings are two--piece High Flow valves, with areceptacle base brazed to the tubing and an integralspring--closed check valve core screwed into the base. SeeFig. 5 on page 8. This check valve is permanentlyassembled into this core body and cannot be servicedseparately. Replace the entire core body if necessary. Servicetools are available from RCD that allow the replacement ofthe check valve core without having to recover the entiresystem refrigerant charge. Apply compressor refrigerant oilto the check valve core’s bottom O--ring. Install the fittingbody and torque to 96 10 in--lbs (10.9  1 Nm). Do notexceed 106 in--lbs (11.9 Nm) when tightening.Table 1 – Cooling Mode (each circuit)Component Status/PositionReversing Valve EnergizedCheck Valve A ClosedCheck Valve B OpenCheck Valve C ClosedCheck Valve D Open