Carrier 38AUZ*07 Series Installation, Start-up And Service Instructions Manual

Contents

14Fig. 8 — Location of Sight Glass(es) and Filter DriersTypical 38AUD SystemsFig. 9 — Typical Piping Connection AssemblyEVACUATION/DEHYDRATION — Evacuate and dehydratethe connected refrigeration system(s) (excluding the 38AUunit) to 500 microns using a two-stage vacuum pump attachedto the service ports outside the 38AU service valves, followingdescription in GTAC II, Module 4, System Dehydration.PRELIMINARY CHARGE — Before starting the unit, chargeR-410A liquid refrigerant into the high side of each 38AUcircuit through the liquid service valve(s). The amount ofrefrigerant added must be at least 80% of the operating chargelisted in Tables 5 or 6 for LINEAR line length LESS thefactory charge quantity (if factory shipping charge has not beenremoved). See example below.Allow high and low side pressures to equalize. If pressures donot equalize readily, charge R-410A vapor (using specialservice manifold with expansion device) into the suction lineservice port for the low side of system to assure charge in theevaporator. Refer to GTAC II, Module 5, Charging, Recover,Recycling, and Reclamation for liquid charging procedures.Example:38AUZ*0860-ft (18.3 m) linear line lengthEquivalent line length 90-ft (27.4 m)Liquid Lift: 20-ft (6.1 m)Select line sizes from Table 5 (38AUZ):Liquid 1/2 inSuction 1-1/8 in.Charge 12.9 lbs (at 75-ft linear length)80% of Operating Charge:0.80 x 12.9 = 10.3 lbsFactory Shipping Charge: 4.9 lbsField-charge quantity: 10.3 lbs – 4.9 lbs = 5.4 lbsFor applications with linear line lengths greater than 100 ft(30.5 m), contact your local Carrier representative.Step 6 — Install AccessoriesAccessories requiring modifications to unit wiring should becompleted now. These accessories may include Winter Startcontrols, Low Ambient controls, phase monitor, CompressorLOCout. Refer to the instructions shipped with the accessory.Step 7 — Complete Electrical ConnectionsNOTE: Check all factory and field electrical connectionsfor tightness. Field-supplied wiring shall conform with thelimitations of 33°C (63°F) rise.Field Power Supply —If equipped with optional Powered Convenience Outlet: Thepower source leads to the convenience outlet's transformer pri-mary are not factory connected. Installer must connect theseleads according to required operation of the convenience outlet.If an always-energized convenience outlet operation is desired,connect the source leads to the line side of the unit-mounteddisconnect. (Check with local codes to ensure this method isacceptable in your area.) If a de-energize via unit disconnectswitch operation of the convenience outlet is desired, connectthe source leads to the load side of the unit disconnect. On aunit without a unit-mounted disconnect, connect the sourceleads to compressor contactor C and indoor fan contactor IFCpressure lugs with unit field power leads.All units are factory wired for the voltage shown on the name-plate. Refer to unit label diagram for additional information.Field power wires are connected to the unit at line-side pres-sure lugs on compressor contactor C and TB1 (see wiring dia-gram label for control box component arrangement) or at facto-ry-installed option non-fused disconnect switch. Use copperconductors only.UNIT OPERATION AND SAFETY HAZARDFailure to follow this warning could cause personal injury,death and/or equipment damage.Puron® (R-410A) refrigerant systems operate at higherpressures than standard R-22 systems. Do not use R-22service equipment or components on Puron refrigerantequipment.INDOORCOIL CKT 2AIRFLOWSUCTIONCIRCUIT BSUCTIONCIRCUIT AAIRFLOW15 DIAMSMIN 10DIAMS8 DIAMSMINTXVSENSINGBULBEQUALIZER LINESIGHTGLASSESTXVCKT BFILTERDRIERSDROP CONTROLSOLENOID VALVECIRCUIT BFLOWDROP CONTROLSOLENOID VALVECIRCUIT AFLOWTXVSENSINGBULBTXVCKT A8 DIAMSMIN15 DIAMSMIN 10DIAMSDual Circuit Coil Piping ConfigurationFor two circuit condensing unitsLEGENDTXV — Thermostatic Expansion ValveFactoryHigh-FlowAccess PortService Valvewith Stem CapField ServiceAccess Port(Schrader core)SweatConnectionELECTRICAL SHOCK HAZARDFailure to follow this warning could result in personalinjury or death.Do not use gas piping as an electrical ground. Unit cabinetmust have an uninterrupted, unbroken electrical ground tominimize the possibility of personal injury if an electricalfault should occur. This ground may consist of electricalwire connected to unit ground lug in control compartment,or conduit approved for electrical ground when installed inaccordance with local electrical codes or in absence oflocal codes, it is recommended that the U.S.A. standardANSI/NFPA 70, National Electrical Code (NEC), befollowed.