Carrier 50VL-A Performance Installation Instructions Manual

Also see for Performance 50VL-A: Owner's information manual Installation instructions Installation instructions Installation instructions

Contents

12PRE--START--UPENVIRONMENTAL, FIRE, EXPLOSION,ELECTRICAL SHOCK HAZARDFailure to follow this warning could result in personalinjury or death and/or property damage.1. Follow recognized safety practices and wear protectivegoggles when checking or servicing refrigerant system.2. Relieve and recover all refrigerant from system beforetouching or disturbing compressor plug if refrigerantleak is suspected around compressor terminals.3. Never attempt to repair soldered connection whilerefrigerant system is under pressure.4. Do not use torch to remove any component. Systemcontains oil and refrigerant under pressure.5. To remove a component, wear protective goggles andproceed as follows:a. Shut off electrical power to unit and installlockout tag.b. Relieve and reclaim all refrigerant from systemusing both high-- and low--pressure ports.c. Cut component connecting tubing with tubingcutter and remove component from unit.d. Carefully unsweat remaining tubing stubs whennecessary. Oil can ignite when exposed to torchflame.! WARNINGProceed as follows to inspect and prepare the unit for initialstart--up:1. Remove all access panels (see Fig. 17).2. Read and follow instructions on all DANGER, WARNING,CAUTION, and INFORMATION labels attached to, orshipped with unit.3. Make the following inspections:a. Inspect for shipping and handling damages, such asbroken lines, loose parts, disconnected wires, etc.b. Inspect for oil at all refrigerant tubing connections andon unit base. Detecting oil generally indicates arefrigerant leak. Leak test all refrigerant tubingconnections using electronic leak detector, orliquid--soap solution. If a refrigerant leak is detected, seefollowing Check for Refrigerant Leaks section.c. Inspect all field-- and factory--wiring connections. Besure that connections are completed and tight.d. Ensure wires do not touch refrigerant tubing or sharpsheet metal edges.e. Inspect coil fins. If damaged during shipping andhandling, carefully straighten fins with a fin comb.4. Verify the following conditions:a. Make sure that condensate drain pan and trap are filledwith water to ensure proper drainage.b. Make sure that all tools and miscellaneous loose partshave been removed.START--UPStep 1 — Check for Refrigerant LeaksProceed as follows to locate and repair a refrigerant leak and tocharge the unit:1. Locate leak and make sure that refrigerant system pressurehas been relieved and reclaimed from both high-- andlow--pressure ports.2. Repair leak following accepted practices.NOTE: Install a filter drier whenever the system has been openedfor repair.3. Add a small charge of Puron (R--410A) refrigerant vapor tosystem and leak--test unit.4. Recover refrigerant from system and evacuate to 500microns if no additional leaks are found.5. Charge unit with Puron (R--410A) refrigerant, using anaccurate scale. Refer to unit rating plate for required charge.Step 2 — Start--Up Cooling Section And MakeAdjustmentsComplete the required procedures given in the Pre--Start--Upsection before starting the unit. Do not jumper any safety deviceswhen operating the unit. Do not operate the unit when the outdoortemperature is below 40°F (4°C) (unless accessory low--ambientkit is installed). Do not rapid cycle the compressor. Allow 5minutes between “on” cycles to prevent compressor damage.CHECKING COOLING CONTROL OPERATIONStart and check the unit for proper cooling control operation asfollows:1. Place room thermostat SYSTEM switch in OFF position.Observe that blower motor starts when FAN switch isplaced in ON position and shuts down when FAN switch isplaced in AUTO position.2. Place SYSTEM switch in COOL position and FAN switchin AUTO position. Set cooling control below roomtemperature. Observe that compressor, condenser fan, andevaporator blower motors start. Observe that compressorand outdoor fan shut down when control setting is satisfiedand that indoor blower shuts down after 90 second fan timedelay expires.IMPORTANT: Three--phase, scroll compressors are directionoriented. Unit must be checked to ensure proper compressor3--phase power lead orientation. If not corrected within 5 minutes,the internal protector will shut off the compressor. The 3--phasepower leads to the unit must be reversed to correct rotation. Whenturning backwards, the difference between compressor suction anddischarge pressures may be minimal.CHECKING AND ADJUSTING REFRIGERANTCHARGEThe refrigerant system is fully charged with Puron (R--410A)refrigerant and is tested and factory sealed.NOTE: Adjustment of the refrigerant charge is not requiredunless the unit is suspected of not having the proper Puron(R--410A) charge.A subcooling charging chart is attached to the inside of thecompressor access panel (see Fig. 17). The chart includes therequired liquid line temperature at given discharge line pressuresand outdoor ambient temperatures.An accurate thermocouple-- or thermistor--type thermometer, and agauge manifold are required when using the subcooling chargingmethod for evaluating the unit charge. Do not use mercury or smalldial--type thermometers because they are not adequate for this typeof measurement.NOTE: Allow system to operate for a minimum of 15 minutesbefore checking or adjusting refrigerant charge.IMPORTANT: When evaluating the refrigerant charge, anindicated adjustment to the specified factory charge must always bevery minimal. If a substantial adjustment is indicated, an abnormalcondition exists somewhere in the cooling system, such asinsufficient airflow across either coil or both coils.50VL-- A