Carrier 38AE012 Installation, Start-up And Service Instructions Manual

Also see for 38AE012: Installation, Start-Up and Service Instructions

Contents

Carrier 38AE012 Installation, Start-up And Service Instructions Manual Manual pdf 9 page image

PRE-START-UPEvacuate and Dehydrate the entire refrigerant sys-tem by either of the methods described in Carrier StandardService Techniques Manual, Chapter 1.Leak Test the entire refrigerant system by the pres-sure method described in Carrier Standard Service Tech-niques Manual, Chapter 1. Use R-22 at approximately25 psig (172.4 kPa) backed up with an inert gas to a totalpressure not to exceed 245 psig (1689 kPa).Turn on Crankcase Heaters for 24 hours before start-ing the unit to be sure all the refrigerant is out of the oil. Toenergize the crankcase heaters, proceed as follows.1. Set the space thermostat set point above the space tem-perature so there is no demand for cooling.2. Close the field disconnect.3. Turn the fan circuit breaker on. Leave the compressor cir-cuit breakers off. The crankcase heaters are nowenergized.Add Preliminary Charge to the refrigerant system ac-cordingly to Carrier Standard Service Techniques Manual,Chapter 1. By the liquid charging method and charging byweight procedure, charge the units with approximately theamounts of R-22 refrigerant shown in Table 6.Table 6 — Charging Data (R-22)UNITREFRIGERANT CHARGE - lb (kg) CONDENSINGTEMPDURINGCHARGING - F (C)Required ChargeAbove ClearSight GlassOutdoor UnitTotal Charge(Approx)38AE012 3.0 (1.4) 22 (10) 125 (51.7)38AE014 4.8 (2.2) 23 (10.5) 123 (50.6)38AE016 3.4 (1.5) 23 (10.5) 130 (54.4)38AKS024 3.4 (1.5) 28 (12.7) 131 (54.8)Before Starting Unit ensure the following:1. Compressor oil level must be at least within sight inthe compressor sight glass. Add oil if necessary (seeTables 1A-1D and Oil Charge section).2. Compressor holddown bolts must be snug, but not tight.Refer to Compressor Mounting section and tag on com-pressor foot.3. All internal wiring connections must be tight; all barriersand covers must be in place.4. Electrical power source must agree with unit nameplaterating.5. All service valves must be open.6. Crankcase heater must be firmly locked into the com-pressor crankcase.START-UPTo Start Unit — Set thermostat set point below the spacetemperature. After starting unit, there is a delay of at least 3seconds before compressor starts.Oil Charge (see Tables 1A-1D) —Allow unit to run forabout 20 minutes. Stop unit and check compressor oil levelat sight glass. Add oil if necessary to bring oil to the correctlevel shown in Fig. 8. Use only Carrier-approved compres-sor oil. Approved oils are:Witco Chemical Corp. . . . . . . . . . . . . . . . . Suniso 3GSTexaco, Inc. . . . . . . . . . . . . . . . . . . . . . . . . . . . WF32Petroleum Specialties Co. . . . . . . . . . . . . . . . Cryol 150Do not reuse drained oil or use any oil that has been ex-posed to atmosphere. Procedures for adding or removing oilare given in Carrier Standard Service Techniques Manual,Chapter 1, Refrigerants.If oil is added, run unit for additional 10 minutes. Stopunit and check oil level. If level is still low, add oil only afterdetermining that piping system is designed for proper oil re-turn and that the system is not leaking oil.Refrigerant Charge — Actual start-up should be doneonly under supervision of a qualified refrigeration me-chanic. Refer to charging charts.See Fig. 9-11 for the particular unit being charged. Mea-sure pressure at the liquid line service valve, being sure aSchrader depressor is used if required. Also, measure liquidline temperature as close to the liquid service valve as pos-sible. Add or reduce charge until the pressure and tempera-ture conditions of the charging charge curve are met. If liq-uid pressure and temperature point falls above curve, addcharge. If liquid pressure and temperature point falls belowcurve, reduce the charge until the conditions match the curve.Never charge liquid into the low-pressure side of sys-tem. Do not overcharge. During charging or removal ofrefrigerant, be sure indoor fan system is operating.38AKS024(06E COMPRESSOR) 38AE012,014,016(06D COMPRESSOR)Fig. 8 — Operating Oil Levels9