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50TCA04---A07
Nominal 3 to 6 Tons
With Puron ® (R410A) Refrigerant
Serviceand MaintenanceInstructions
TABLEOFCONTENTS SAFETYCONSIDERATIONS
SAFETY CONSIDERATIONS .................... 1
Installation and servicing of air-conditioning equipment
can be hazardous due to system pressure and electrical
UNIT ARRANGEMENT AND ACCESS ........... 2
components. Only trained and qualified service personnel
SUPPLY FAN (BLOWER) SECTION .............. 3
should install, repair, or service air-conditioning
COOLING
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RoutineMaintenance ! WARNING These items should be part of a routine maintenance program, to be checked every month or two, until a ELECTRICALOPERATIONHAZARD specific schedule for each can be identified for this Failure to follow this warning could result in personal installation: injuryordeath. QuarterlyInspection(and30daysafterinitialstart) Units with convenience outlet circuits may use multiple disconnects. Check convenience outlet for S Returnairfilterreplacement power status before opening
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located on the rear side of the unit, above the evaporator/return air access panel. (See Fig. 1.) To remove the filters: 1. Grasp the bottom flange of the upper panel. 2. Lift up and swing the bottom out until the panel dis- engages and pulls out. 3. Reach inside and extract the filters from the filter rack. 4. Replace these filters as required with similar replace- ment filters of same size. To re--install the access panel: C07156 1. Slide the top of the panel up under the unit top panel. Fig.
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inside surfaces. Checkbelt tensionbyusing a spring--force To change fan speed: tool (such as Browning’s Part Number “Belt Tension 1. Shut off unit power supply. Checker” or equivalent tool); tension should be 6--lbs at a 2. Loosen belt by loosening fan motor mounting nuts. 5/8--in. deflection when measured at the centerline of the (See Fig. 5.) belt span. This point is at the center of the belt when 3. Loosen movable pulley flange setscrew. (See Fig. 6.) measuring the distance between the motor
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Motor life of the coil and extend the life of the unit. The following maintenance and cleaning procedures are When replacing the motor, also replace the external--tooth recommended as part of the routine maintenance activities lock washer (star washer) under the motor mounting base; to extend the life of the coil. this is part of the motor grounding system. Ensure the teeth on the lock washer are in contact with the motor’s RemoveSurfaceLoadedFibers painted base. Tighten motor mounting bolts to
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Two--RowCoils 6. Use a water hose or other suitable equipment to flush down between the 2 coil sections to remove dirt and Clean coil as follows: debris. Clean the outer surfaces with a stiff brush in 1. Turn off unit power, tag disconnect. the normal manner. 2. Remove top panel screws on condenser end of unit. 7. Secure inner and outer coil rows together with a field--supplied fastener. 3. Remove condenser coil corner post. See Fig. 8. To hold top panel open, place coil corner post between 8. R
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6. Hold garden sprayer nozzle close to finned areas and The brass fittings are two--piece High Flow valves, with a apply cleaner with a vertical, up--and--down motion. receptacle base brazed to the tubing and an integral Avoid spraying in horizontal pattern to minimize po- spring--closed check valve core screwed into the base. tential for fin damage. (See Fig. 11.) This check valve is permanently assembled into this core body and cannot be serviced separately; 7. Ensure cleaner thoroughly penetr
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ToUseCoolingChargingCharts EXAMPLE: Model 50TC*A06 Take the outdoor ambient temperature and read the suction pressure gauge. Refer to chart to determine what Outdoor Temperature.................. 85_F(29_C) suction temperature should be. If suction temperature is Suction Pressure................. 130 psig (896 kPa) high, add refrigerant. If suction temperature is low, Suction Temperature should be......... 63_F (17.2_C) carefully recover some of the charge. Recheck the suction pressure as charge
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COOLINGCHARGINGCHARTS C08203 C08204 Fig. 12 -- Cooling Charging Charts 9 50TC
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COOLINGCHARGINGCHARTS(cont) C08228 C08229 Fig.12 -- CoolingChargingCharts(cont.) 10 50TC
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The suction and discharge pressure levels should now Compressor move to their normal start--up levels. Lubrication NOTE: When the compressor is rotating in the wrong The compressor is charged with the correct amount of oil direction, the unit makes an elevated level of noise and at the factory. does not provide cooling. FilterDrier ! CAUTION Replace whenever refrigerant system is exposed to atmosphere. Only use factory specified liquid--line filter UNIT DAMAGE HAZARD driers with working pressure
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Table1–CoolingServiceAnalysis PROBLEM CAUSE REMEDY Power failure. Callpowercompany. Fuseblownorcircuitbreakertripped. Replacefuseorresetcircuitbreaker. Defectivethermostat,contactor,transformer, Replacecomponent. CompressorandCondenser or controlrelay. Fan WillNotStart. Insufficientlinevoltage. Determinecauseand correct. Incorrectorfaulty wiring. Checkwiring diagramand rewire correctly. Thermostatsetting toohigh. Lower thermostatsetting belowroomtemperature. Faulty wiring orlooseconnectionsin co
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or HACR switch is open. Other connection methods will CONVENIENCEOUTLETS result in the convenience outlet circuit beingde--energized when the unit disconnect or HACR switch is open. See ! Fig. 15. WARNING ELECTRICALOPERATIONHAZARD Failure to follow this warning could result in personal injuryordeath. Units with convenience outlet circuits may use multiple disconnects. Check convenience outlet for power status before opening unit for service. Locate its disconnect switch, if appropriate, and open
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operation are factory--provided and mounted. The unit is inspections without having to disassemble the sensor. The factory--configured for immediate smoke detector cover attaches to the sensor housing using four captive shutdown operation; additional wiring or modifications to screws and forms an airtight chamber around the sensing unit terminal board may be necessary to complete the unit electronics. Each sensor includes a harness with an RJ45 and smoke detector configuration to meet project te
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For installations using two sensors, the duct smoke Return Air with Economizer — The sampling tube is detector does not differentiate which sensor signals an inserted through the side plates of the economizer alarm or trouble condition. housing, placing it across the return air opening on the unit basepan. See Fig. 20. The holes in the sampling tube SmokeDetectorLocations face downward, into the return air stream. The sampling tube is connected via tubing to the return air sensor that is Supply
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6. For units with an economizer, the samplingtube isin- Highlight B: Smoke detector NC contact set will open on tegrated into the economizer housing but the connec- smoke alarm condition, de--energizing the ORN tion of the flexible tubing to the sampling tube is the conductor. same. Highlight C: 24--v power signal via ORN lead is removed at Smoke Detector input on LCTB; all unit operations cease immediately. PremierLink Control: Unit operating functions (fan, cooling and heating) are terminated
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SensorandControllerTests ! CAUTION SensorAlarmTest The sensoralarm test checks a sensor’s abilityto signal an OPERATIONAL TEST HAZARD alarm state. Thistest requiresthat you use a fieldprovided Failure to follow this caution may result in personnel SD--MAG test magnet. and authority concern. Pressing the controller’s test/reset switch for longer ! CAUTION than seven seconds will put the duct detector into the alarm state andactivate all automatic alarm responses. OPERATIONAL TEST HAZARD Failure t
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ChangingtheDirtSensorTest 12 By default, sensor dirty test results are indicated by: Smoke Detector Controller 1 S The sensor’sDirtyLEDflashing. TB3 S The controller’sTrouble LEDflashing. − 1 Auxiliary equipment S The controller’ssupervisionrelaycontactstoggle. + 2 The operation of a sensor’s dirty test can be changed so 3 14 that the controller’s supervision relay is not used to SD-TRK4 indicate test results. When two detectors are connected to Supervision relay contacts [3] a controller, sens
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Table3–DetectorIndicators CONTROLORINDICATOR DESCRIPTION Magnetictest/resetswitch Resetsthesensor when itisin thealarmor troublestate.Activatesor teststhesensor when itisin thenormalstate. AlarmLED Indicatesthesensorisin thealarmstate. Trouble LED Indicatesthesensorisinthetroublestate. Dirty LED Indicatestheamountof environmentalcompensation used by thesensor (flashing continuously =100%) Power LED Indicatesthesensorisenergized. INDICATORS ! CAUTION NormalState OPERATIONAL TEST HAZARD The smoke
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S If a wiring fault between a sensor and the controller, the 2. Check the wiring between the sensor and the control- ler. If wiring is loose or missing, repair or replace as controller’sTrouble LEDturnsonbut not the sensor’s. required. Controller’sPowerLEDisOff Trouble 1. Make sure the circuit supplying power to the control- Alarm Power ler is operational. If not, make sure JP2 and JP3 are set correctly on the controller before applying power. 2. Verify that power is applied to the controller’s
