Carrier 48HC*04–14 Service And Maintenance Instructions

16DFT 2DFT1FILTERDRIERFILTERDRIER1A2AOUTDOOR COILINDOOR COILACCUMULATORACCUMULATORHPS1STRAINER HEATING LIQUID LINESSTRAINER1C2C2D1DTXV 2TXV1COOLING LIQUID LINESLPS/LOC2B1BHPS2COMPRESSORCOMPRESSORCOMP 2COMP 1ACCUTROLC12046Fig. 20 -- Typical TXV Piping SchematicRefrigerant System Pressure Access PortsThere are two access ports in the system -- on the suctiontube near the compressor and on the discharge tube nearthe compressor. These are brass fittings with black plasticcaps. The hose connection fittings are standard 1/4 SAEmale 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. 21. This check valve is permanently assembled intothis core body and cannot be serviced separately; replacethe entire core body if necessary. Service tools areavailable from RCD that allow the replacement of thecheck valve core without having to recover the entiresystem refrigerant charge. Apply compressor refrigerantoil to the check valve core’s bottom o--ring. Install thefitting body with 96  10 in--lbs (10.85  1.1 Nm) oftorque; do not overtighten.PURONR (R--410A) REFRIGERANTThis unit is designed for use with Puron (R--410A)refrigerant. Do not use any other refrigerant in thissystem. Puron (R--410A) refrigerant is provided in pink(rose) colored cylinders.Puron (R--410A) refrigerant is provided in pink (rose)colored cylinders. These cylinders are available with andwithout dip tubes; cylinders with dip tubes will have alabel indicating this feature. For a cylinder with a diptube, place the cylinder in the upright position (accessvalve at the top) when removing liquid refrigerant forcharging. For a cylinder without a dip tube, invert thecylinder (access valve on the bottom) when removingliquid refrigerant.Because Puron (R--410A) refrigerant is a blend, it isstrongly recommended that refrigerant always be removedfrom the cylinder as a liquid. Admit liquid refrigerant intothe system in the discharge line. If adding refrigerant intothe suction line, use a commercial metering/expansiondevice at the gauge manifold; remove liquid from thecylinder, pass it through the metering device at the gaugeset and then pass it into the suction line as a vapor. Do notremove Puron (R--410A) refrigerant from the cylinder as avapor.Refrigerant ChargeAmount of refrigerant charge is listed on the unit’snameplate. Refer to Carrier GTAC2--5 Charging,Recovery, Recycling and Reclamation training manualand the following procedures.Unit panels must be in place when unit is operating duringthe charging procedure.48HC