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48TC*D08---D14
Nominal 7.5 to 12.5 Tons
With Puron ® (R---410A) 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 .............. 4
should install, repair, or service air-conditioning
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! ! WARNING WARNING FIRE,EXPLOSIONHAZARD FIRE,EXPLOSIONHAZARD Failure to follow this warning could result in personal Failure to follow this warning could result in injuryordeath. personal injury, deathand/orpropertydamage. Disconnect gas piping from unit when pressure testing Refer to the User’s Information Manual provided at pressure greater than 0.5 psig. Pressures greater withthisunitformoredetails. than 0.5 psig will cause gas valve damage resulting in Do not store or use gasoline or other
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Heating S Heatexchangerfluepassagewayscleanliness S Gasburnercondition S Gasmanifoldpressure S Heatingtemperature rise EconomizerorOutsideAirDamper S Inlet filterscondition BLOWER ACCESS FLUE OPENING S Checkdampertravel(economizer) PANEL CONTROL BOX S Checkgearanddampersfordebrisanddirt COMPRESSOR AirFiltersandScreens C08450 Fig. 2 -- Typical AccessPanel Location(Front) Each unit is equipped with return air filters. If the unithas an economizer, it will also have an outside air screen. If a manu
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SUPPLYFAN(BLOWER)SECTION 22 3/8 (569 mm) ! WARNING ELECTRICALSHOCKHAZARD Failure to follow this warning could cause personal injuryordeath. DIVIDER Before performing service or maintenance operations OUTSIDE on the fan system, shut offall unit power andtag--out AIR the unit disconnect switch. Do not reach into the fan HOOD sectionwithpowerstillappliedtounit. CLEANABLE ALUMINUM FILTER SupplyFan(Belt--Drive) FILTER The supply fan system consists of a forward--curved BAROMETRIC centrifugal blower w
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To replace the belt: To align fan and motor pulleys: 1. Use a belt with same section type or similar size. Do 1. Loosen fan pulley setscrews. not substitute a “FHP” type belt. When installing the 2. Slide fan pulley along fan shaft. Make angular align- new belt, do not use a tool (screwdriveror pry--bar)to ment by loosening motor from mounting. force the belt over the pulley flanges, this will stress 3. Tighten fan pulley setscrews and motor mounting the belt and cause a reduction in belt life.
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TUBES Changing fan wheel speed by changing pulleys: The horsepower rating of the belt is primarily dictated by the pitch diameter of the smaller pulley in the drive system FINS (typically the motor pulley in these units). Do not install a replacement motor pulley with a smaller pitch diameter than provided on the original factory pulley. Change fan wheel speed by changing the fan pulley (larger pitch diameter to reduce wheel speed, smaller pitch diameter to increase wheel speed) or select a new
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RoutineCleaningofNOVATIONCondenserCoil Totaline Environmentally Sound Coil Cleaner Application Surfaces Equipment S 2-1/2gallongardensprayer To clean the NOVATION condenser coil, chemicals are NOT to be used; only water is approved as the cleaning S waterrinsewithlowvelocityspraynozzle solution. Only clean potable water is authorized for cleaning NOVATION condensers. Carefully remove any ! CAUTION foreign objects or debris attached to the coil face or trapped within the mounting frame and bracke
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5. Finned surfaces should remain wet with cleaning Because Puron (R--410A) refrigerant is a blend, it is solution for 10 minutes. strongly recommended that refrigerant always be removed from the cylinder as a liquid. Admit liquid refrigerant into 6. Ensure surfaces are not allowed to dry before rinsing. the system in the discharge line. If adding refrigerant into Reapply cleaner as needed to ensure 10--minute satur- the suction line, use a commercial metering/expansion ation is achieved. device
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SEAT CORE (Part No. EC39EZ067) 1/2-20 UNF RH 0.596 o 45 o 30 WASHER DEPRESSOR PER ARI 720 O-RING +.01/-.035 1/2" HEX .47 FROM FACE OF BODY 5/8” HEX 7/16-20 UNF RH This surface provides a metal to metal seal when torqued into the seat. Appropriate handling is required to not scratch or dent the surface. C08453 Fig. 9 -- CoreMax AccessPort Assembly EXAMPLE: Model 48TC*D14 Circuit A: Outdoor Temperature.................. 85_F(29_C) Suction Pressure................. 125 psig (860 kPa) Sucti
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COOLINGCHARGINGCHARTS C08669 Fig. 10 -- Cooling Charging Charts(D08) 10 48TC
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COOLINGCHARGINGCHARTS C08670 Fig. 11 -- Cooling Charging Charts(D12) 11 48TC
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COOLINGCHARGINGCHARTS C09151 Fig. 12 -- Cooling Charging Charts(D14 -- Circuit A) 12 48TC
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COOLINGCHARGINGCHARTS C09152 Fig. 13 -- Cooling Charging Charts(D14 -- Circuit B) 13 48TC
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Table1–CoolingServiceAnalysis PROBLEM CAUSE REMEDY Power failure. Callpowercompany. Fuseblownorcircuitbreakertripped. Replacefuseorresetcircuitbreaker. Defectivethermostat,contactor,transformer, Replacecomponent. CompressorandCondenser orcontrolrelay. Fan WillNotStart. Insufficientlinevoltage. Determinecauseand correct. Incorrectorfaulty wiring. Checkwiring diagramand rewirecorrectly. Thermostatsetting toohigh. Lowerthermostatsetting belowroomtemperature. Faultywiring orlooseconnectionsin Checkw
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6. Reverse any two of the unit power leads. Compressors 7. Reapply power to the compressor. Lubrication The suction and discharge pressure levels should now Compressors are charged with the correct amount of oil at move to their normal start--up levels. the factory. NOTE: When the compressor is rotating in the wrong direction, the unit makes an elevated level of noise and ! CAUTION does not provide cooling. UNIT DAMAGE HAZARD FilterDrier Failure to follow this caution may result in damage to Rep
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The primary leads to the convenience outlet transformer CONVENIENCEOUTLETS are not factory--connected. Selection of primary power source is a customer--option. If local codes permit, the ! transformer primary leads can be connected at the WARNING line--side terminals on a unit--mounted non--fused ELECTRICALOPERATIONHAZARD disconnect or circuit--breaker switch; this will provide service power to the unit when the unit disconnect switch Failure to follow this warning could result in personal or ci
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Maintenance Periodically test the GFCI receptacle by pressing the TEST button on the face of the receptacle. This should cause the internal circuit of the receptacle totrip andopen the receptacle. Check for proper grounding wires and Duct smoke sensor power line phasing if the GFCI receptacle does not trip as controller required. Press the RESET button to clear the tripped condition. Conduit nuts (supplied by installer) FuseOnPoweredType Conduit support plate The factory fuse is a Bussman “Fuset
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The sensor uses a process called differential sensing to prevent gradual environmental changes from triggering false alarms. A rapid change in environmental conditions, such as smoke from a fire, causes the sensor to signal an alarm state but dust and debris accumulated over time does not. Smoke Detector Sensor Duct smoke sensor C08245 Exhaust tube Fig. 20 -- Typical Supply Air Smoke Detector Sensor Exhaust gasket Location Sensor housing and electronics See Return Air without Economizer — The sa
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4. Screw the sensor and detector plate into its operating position using screws from Step 1. Make sure the samplingtube connectionisonthe bottom and the ex- haust tube is on the top. (See Fig. 23.) 5. Connect the flexible tube on the sampling inlet to the sampling tube on the basepan. 6. For units with an economizer, the samplingtube isin- tegrated into the economizer housing but the connec- tion of the flexible tubing to the sampling tube is the Return Air same. Sampling Tube C08129 Fig. 22 --
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B D C F E A C08246 Fig. 25 -- Typical Smoke Detector System Wiring Highlight C: 24--v power signal via ORN lead is removed SensorandControllerTests at Smoke Detector input on LCTB; all unit operations SensorAlarmTest cease immediately. The sensoralarm testchecks asensor’s abilityto signalan PremierLinkt and RTU--MP Controls: Unit operating alarm state. Thistest requiresthat you use a fieldprovided functions (fan, cooling and heating) are terminated as SD--MAG test magnet. described above. In add
