Carrier 48TC*D08 Service And Maintenance Instructions
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Carrier 48TC*D08 Service And Maintenance Instructions

Nominal 7.5 to 12.5 tons with puron (r---410a) refrigerant
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See also: Product Data , User's Information Manual
48TC*D08---D14
Nominal 7.5 to 12.5 Tons
With Puron® (R---410A) Refrigerant
Service and Maintenance Instructions

TABLE OF CONTENTS

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SAFETY CONSIDERATIONS

1
Installation and servicing of air-conditioning equipment
can be hazardous due to system pressure and electrical
2
components. Only trained and qualified service personnel
4
should
install,
6
equipment. Untrained personnel can perform the basic
maintenance functions of replacing filters. Trained service
8
personnel should perform all other operations.
10
When working on air-conditioning equipment, observe
16
precautions in the literature, tags and labels attached to
17
the unit, and other safety precautions that may apply.
24
Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloth for unbrazing operations.
25
Have fire extinguishers available for all brazing
35
operations.
36
Follow all safety codes. Wear safety glasses and work
44
gloves. Use quenching cloth for brazing operations. Have
57
fire extinguisher available. Read these instructions
thoroughly and follow all warnings or cautions attached to
66
the unit. Consult local building codes and National
69
Electrical Code (NEC) for special requirements.
69
Recognize safety information. This is the safety- - alert
71
symbol
. When you see this symbol on the unit and in
71
instructions or manuals, be alert to the potential for
personal injury.
75
85
Understand the signal words DANGER, WARNING, and
CAUTION. These words are used with the safety- - alert
.
87
symbol. DANGER identifies the most serious hazards
88
which will result in severe personal injury or death.
90
WARNING signifies a hazard which could result in
personal injury or death. CAUTION is used to identify
96
unsafe practices which may result in minor personal
injury or product and property damage. NOTE is used to
97
highlight suggestions which will result in enhanced
98
installation, reliability, or operation.
repair,
or
service
air-conditioning

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Summary of Contents for Carrier 48TC*D08

  • Page 1: Table Of Contents

    48TC*D08---D14 Nominal 7.5 to 12.5 Tons With Puron® (R---410A) Refrigerant Service and Maintenance Instructions TABLE OF CONTENTS SAFETY CONSIDERATIONS ....UNIT ARRANGEMENT AND ACCESS...

  • Page 2: Unit Arrangement And Access

    WARNING FIRE, EXPLOSION HAZARD Failure to follow this warning could result in personal injury, death and/or property damage. Refer to the User’s Information Manual provided with this unit for more details. Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.
  • Page 3 FLUE OPENING CONTROL BOX COMPRESSOR Fig. 2 - - Typical Access Panel Location (Front) Routine Maintenance These items should be part of a routine maintenance program, to be checked every month or two, until a specific schedule for each can be identified for this installation: Quarterly Inspection (and 30 days after initial start) S Return air filter replacement...

  • Page 4: Supply Fan (Blower) Section

    22 3/8 (569 mm) DIVIDER OUTSIDE CLEANABLE FILTER ALUMINUM FILTER BAROMETRIC RELIEF Fig. 3 - - Filter Installation To remove the filter, open the spring clips. Re- - install the filter by placing the frame in its track, then closing the spring clips.
  • Page 5 To replace the belt: 1. Use a belt with same section type or similar size. Do not substitute a “FHP” type belt. When installing the new belt, do not use a tool (screwdriver or pry- - bar) to force the belt over the pulley flanges, this will stress the belt and cause a reduction in belt life.

  • Page 6: Cooling

    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 (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.
  • Page 7 Monthly cleaning with Totaline® environmentally sound coil cleaner is essential to extend the life of coils. This cleaner is available from Carrier Replacement parts division as part number P902- - 0301 for one gallon container, and part number P902- - 0305 for a 5 gallon container.

  • Page 8: Puronr (R- - 410A) Refrigerant

    Refrigerant Charge Amount of refrigerant charge is listed on the unit’s nameplate. Refer Carrier GTAC2- - 5 Charging, Recovery, Recycling and Reclamation training manual and the following procedures. Unit panels must be in place when unit is operating during the charging procedure.
  • Page 9 SEAT 1/2-20 UNF RH 5/8” HEX EXAMPLE: Model 48TC*D14 Circuit A: Outdoor Temperature ....Suction Pressure ....Suction Temperature should be .

  • Page 10: Cooling Charging Charts

    COOLING CHARGING CHARTS C08669 Fig. 10 - - Cooling Charging Charts (D08)
  • Page 11 COOLING CHARGING CHARTS C08670 Fig. 11 - - Cooling Charging Charts (D12)

  • Page 12: Cooling Charging Charts

    COOLING CHARGING CHARTS C09151 Fig. 12 - - Cooling Charging Charts (D14 - - Circuit A)
  • Page 13 COOLING CHARGING CHARTS C09152 Fig. 13 - - Cooling Charging Charts (D14 - - Circuit B)
  • Page 14 PROBLEM CAUSE Power failure. Fuse blown or circuit breaker tripped. Defective thermostat, contactor, transformer, Compressor and Condenser or control relay. Fan Will Not Start. Insufficient line voltage. Incorrect or faulty wiring. Thermostat setting too high. Faulty wiring or loose connections in compressor circuit.
  • Page 15 Compressors Lubrication Compressors are charged with the correct amount of oil at the factory. CAUTION UNIT DAMAGE HAZARD Failure to follow this caution may result in damage to components. The compressor is in a PuronR refrigerant system and uses a polyolester (POE) oil. This oil is extremely hygroscopic, meaning it absorbs water readily.

  • Page 16: Convenience Outlets

    CONVENIENCE OUTLETS WARNING ELECTRICAL OPERATION HAZARD Failure to follow this warning could result in personal injury or death. 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 it. Tag- - out this switch, if necessary.

  • Page 17: Smoke Detectors

    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 to trip and open the receptacle. Check for proper grounding wires and power line phasing if the GFCI receptacle does not trip as required.
  • Page 18 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.
  • Page 19 Fig. 22 - - Return Air Sampling Tube Location Completing Installation of Return Air Smoke Sensor: Fig. 23 - - Return Air Detector Shipping Position 1. Unscrew the two screws holding the Return Air Sensor detector plate. (See Fig. 23.) Save the screws. 2.
  • Page 20 Fig. 25 - - Typical Smoke Detector System Wiring Highlight C: 24- - v power signal via ORN lead is removed at Smoke Detector input on LCTB; all unit operations cease immediately. PremierLinkt and RTU- - MP Controls: Unit operating functions (fan, cooling and heating) are terminated as described above.
  • Page 21 CAUTION OPERATIONAL TEST HAZARD Failure to follow this caution may result in personnel and authority concern. This test places the duct detector into the alarm state. Disconnect all auxiliary equipment from the controller before performing the test. If the duct detector is connected to a fire alarm system, notify the proper authorities before performing the test.
  • Page 22 SD- - TRK4 Remote Alarm Test Procedure 1. Turn the key switch to the RESET/TEST position for seven seconds. 2. Verify that the test/reset station’s Alarm LED turns 3. Reset the sensor by turning the key switch to the RESET/TEST position for two seconds. 4.
  • Page 23 INDICATORS Normal State The smoke detector operates in the normal state in the absence of any trouble conditions and when its sensing chamber is free of smoke. In the normal state, the Power LED on both the sensor and the controller are on and all other LEDs are off.

  • Page 24: Protective Devices

    CONTROL OR INDICATOR Resets the sensor when it is in the alarm or trouble state. Activates or tests the sensor when it is in Magnetic test/reset switch the normal state. Alarm LED Indicates the sensor is in the alarm state. Trouble LED Indicates the sensor is in the trouble state.

  • Page 25: Gas Heating System

    Condenser Fan Motor Protection The condenser fan motor is internally protected against overtemperature. Control Circuit, 24- -V The control circuit is protected against overcurrent conditions by a circuit breaker mounted on control transformer TRAN. Reset is manual. GAS HEATING SYSTEM General The heat exchanger system consists of a gas valve feeding multiple inshot burners off a manifold.
  • Page 26 48TCDD08 only All 48TC*D except DD08 Fig. 31 - - LP Low Pressure Switch (Installed) LP LPS J2-11 J2-12 TSTAT Fig. 32 - - LP Supply Line Low Pressure Switch Wiring This switch also prevents operation when the propane tank level is low which can result in gas with a high concentration of impurities, additives, and residues that have settled to the bottom of the tank.
  • Page 27 RETAINER WIND CAP ASSEMBLY (SHOWN INVERTED, AS SHIPPED) Burners and Igniters CAUTION EQUIPMENT DAMAGE HAZARD Failure to follow this caution may result in equipment damage. When working on gas train, do not hit or plug orifice spuds. Main Burners To access burners, remove burner access panel and slide out burner partition.
  • Page 28 MANIFOLD PRESSURE TAP VALVE Fig. 35 - - Burner Tray Details 6. Remove igniter wires and sensor wires at the Integ- rated Gas Unit Controller (IGC). (See Fig. 36.) 7. Remove the 2 screws that attach the burner rack to the vestibule plate.

  • Page 29: Burner Ignition

    Burner Ignition Unit is equipped with a direct spark ignition 100% lockout system. Integrated Gas Unit Controller (IGC) is located in the control box. (See Fig. 36.) The IGC contains a self- - diagnostic LED (light- - emitting diode). A single LED (see Fig.
  • Page 30 This unit uses orifice type LH32RFnnn (where nnn indicates orifice reference size). When replacing unit orifices, order the necessary parts via Carrier RCD. See Table 11 for available orifice sizes. See Table 12 for orifice sizes for Natural Gas and LP fuel usage at various elevations above sea level.
  • Page 31 Red LED-Status Fig. 39 - - Integrated Gas Control (IGC) Board TERMINAL LABEL POINT DESCRIPTION INPUTS RT, C Input power from TRAN 1 Speed sensor FS, T1 Flame sensor Heat stage 1 Rollout switch Limit switch Centrifugal switch (not used) OUTPUTS L1, CM Induced draft combustion motor...
  • Page 32 * As the height above sea level increases, there is less oxygen per cubic ft. of air. Therefore, heat input rate should be reduced at higher altitudes. { Not included in kit. May be purchased separately through dealer. Table 11 – Orifice Sizes CARRIER PART NUMBER LH32RF129 LH32RF125 LH32RF120 LH32RF116...
  • Page 33 Minimum Heating Entering Air Temperature When operating on first stage heating, the minimum temperature of air entering the dimpled heat exchanger is 50_F continuous and 45_F intermittent for standard heat exchangers and 40_F continuous and 35_F intermittent for stainless steel heat exchangers. To operate at lower mixed- - air temperatures, a field- - supplied outdoor- - air thermostat must be used to initiate both stages of heat when the temperature is below the minimum required...
  • Page 34 ACTION TAKEN BY FLASH DESCRIPTION CODE Normal Operation Hardware Failure No gas heating. Gas valve and igniter Off. Limit Switch Fault Flashes Indoor fan and inducer Indoor fan and inducer Flame Sense Fault Flashes Four Consecutive Limit No gas heating. Flashes Switch Fault Ignition Fault...

  • Page 35: Condenser Coil Service

    CONDENSER COIL SERVICE Condenser Coil The condenser coil is new NOVATION Heat Exchanger Technology. This is an all- - aluminum construction with louvered fins over single- - depth crosstubes. The crosstubes have multiple small passages through which the refrigerant passes from header to header on each end. Tubes and fins are both aluminum construction.

  • Page 36: Premierlinkt Control

    Have a copy of this manual available at unit start- - up. The PremierLink controller requires the use of a Carrier electronic thermostat or a CCN connection for time broadcast to initiate its internal timeclock. This is necessary for broadcast of time of day functions (occupied/unoccupied).
  • Page 38 Space Sensors — The PremierLink controller is 42,315 factory- - shipped configured for Space Sensor Mode. A 32,651 Carrier T- - 55 or T- - 56 space sensor must be used. T- - 55 25,395 space temperature sensor provides a signal of space 19,903...
  • Page 39 OAQ ---SEN/RH ---SEN CCN Gnd (WHT) AUX OUT(Power Exhaust) LEGEND: --- Space Temperature Sensor --- Space Temperature Sensor --- Carrier Comfort Network (communication bus) CMPSAFE --- Compressor Safety FILTER --- Dirty Filter Switch Table 16 – PremierLink Sensor Usage RETURN AIR...
  • Page 40 TB1 TERMINAL IAQ ---COM/OAQ ---COM/RH ---COM LEGEND: Carrier Comfort Network (communication bus) Thermostat Fan Indoor Air Quality (CO Outdoor Air Quality (CO Return Air Temperature Connect T- - 56 — See Fig. 46 for T- - 56 internal connections. Install a jumper between SEN and SET terminals as illustrated.
  • Page 41 Configure the unit for Thermostat Mode — Connect to the CCN bus using a CCN service tool and navigate to PremierLink Configuration screen for Operating Mode. Default setting is Sensor Mode (value 1). Change the value to 0 to reconfigure the controller for Thermostat Mode.
  • Page 42 The CO sensors are all factory set for a range of 0 to 2000 ppm and a linear mA output of 4 to 20. Refer to the instructions supplied with the CO requirements and terminal locations. See Fig. 51 for typical CO sensor wiring schematic.
  • Page 43 Refer to the Rooftop PremierLink Installation, Start-Up, Configuration Instructions (Form PremierLink Installation, Start- - up, and Configuration Instructions, for detailed configuration information. Smoke Detector/Fire Shutdown (FSD) — This function is available only when PremierLink is configured for (Space) Sensor Mode. The unit is factory- - wired for PremierLink FSD operation when PremierLink is factory- - installed.

  • Page 44: Rtu- - Mp Control System

    1000- - ft (305m) section. Optically isolated RS- - 485 repeaters are required every 1000 ft (305m). NOTE: Carrier device default is 9600 baud. COMMUNICATION BUS WIRE SPECIFICATIONS — The CCN Communication Bus wiring is field- - supplied and field- - installed.
  • Page 45 C07129 Fig. 60 - - RTU- - MP Multi- - Protocol Control Board...
  • Page 47 Have a copy of these manuals available at unit start- - up. The RTU- - MP controller requires the use of a Carrier space sensor. A standard thermostat cannot be used with the RTU- - MP system.
  • Page 48 Phoenix connectors and then reconnect the connectors to the board. Space Temperature (SPT) Sensors A field- - supplied Carrier space temperature sensor is required with the RTU- - MP to monitor space temperature. There are 3 sensors available for this application:...
  • Page 49 Locate the enthalpy control in the economizer hood. Locate two GRA leads in the factory harness and connect these leads to enthalpy control sensors 2 and 3. (See Fig. 49.) Connect the enthalpy control power input terminals to economizer actuator power leads RED (connect to TR) and BLK (connect to TR1).
  • Page 50 To connect the sensor to the control, identify the positive (4 to 20 mA) and ground (SIG COM) terminals on the OAQ sensor. See Fig. 51. Connect the 4 to 20 mA terminal to RTU- - MP J4- - 5. Connect the SIG COM terminal to RTU- - MP J4- - 6.
  • Page 51 BACnet over BACnet- - only controllers. This is the default Carrier communications protocol. Each RTU- - MP module acts as an MS/TP Master. The speed of an MS/TP network can range from 9600 to 76.8K baud. Physical Addresses can be set from 01 to 99.
  • Page 52 Fig. 69 - - BACview The LEDs on the RTU- - MP show the status of certain functions Status is... If this LED is on... Power The RTU MP has power The RTU MP is receiving data from the network segment The RTU MP is transmitting data over the network segment The digital output is active The Run and Error LEDs indicate control module and network status...
  • Page 53 BACnet POINT NAME OBJECT NAME Safety Chain Alarm safety_chain Fire Shutdown Alarm fire_alarm Space Temp Sensor spt_alarm Failure SAT Sensor Alarm sat_alarm High Space Temp Alarm spt_hi Low Space Temp Alarm spt_lo High Supply Air Temp sat_hi Low Supply Air Temp sat_lo Supply Fan Failed to sf_fail...
  • Page 54 Alarms Alarms can be checked through the network and/or the local access. All the alarms are listed in Table 23 with name, object name, action taken by control, reset method, and probable cause. There are help screens for each alarm on the local access display and listed in RTU- - MP Controls, Start- - Up, Operation, and Troubleshooting Instructions (Form 48- - 50H- - T- - 2T), Appendix A: Help...
  • Page 55 Device Instance: 0160001 1 PRGs loaded. 1 PRGs running. Module status: Firmware sections validated in flash memory ============================================ Boot16-H - v2.06:001 RTU-MP DRIVER - v2.09:050 Reset counters: 11 Power failures 0 Brownouts 18 Commanded warm boots 22 Commanded cold boots 0 System errors 0 Watchdog timeouts System error message history:...
  • Page 56 When troubleshooting, you may need to know a control module’s manufacture date Obtain the manufacture date from Notes a... Module status report (modstat) To obtain a modstat with BACview 1. Press Function (FN) key and hold. 2. Then press period (.) 3.

  • Page 57: Economi$Er Systems

    NOTE: See RTU- - MP 3rd Party Integration Guide (or alternatively RTU- - MP 3rd Party Integration Guide (or alternatively RTU- - MP Controls, Start- - Up, Operation, and Troubleshooting Instructions (Form Appendix) for Modbus Protocol Conformance Statement. 1. Verify that the BAS and controller are both set to speak the N2 protocol.
  • Page 58 500 OHM RESISTOR NOTE 1 NOTE 3 50HJ540573 ACTUATOR ASSEMBLY DIRECT DRIVE ACTUATOR NOTES: 1. Switch on actuator must be in run position for economizer to operate. 2. PremierLink™ control requires that the standard 50HJ540569 outside-air sensor be replaced by either the CROASENR001A00 dry bulb sen sor or HH57A077 enthalpy sensor.
  • Page 59 A functional view of the EconoMi$er is shown in Fig. 75. Typical settings, sensor ranges, and jumper positions are also shown. An EconoMi$er IV simulator program is available from Carrier to help with EconoMi$er IV training and troubleshooting. Compressor Stage...
  • Page 60 Supply Air Temperature (SAT) Sensor The supply air temperature sensor is a 3 K thermistor located at the inlet of the indoor fan. (See Fig. 76.) This sensor is factory installed. The operating range of temperature measurement is 0° to 158_F (- - 18_ to 70_C). See Table 15 for sensor temperature/resistance values.
  • Page 61 Differential Dry Bulb Control For differential dry bulb control the standard outdoor dry bulb sensor is used in conjunction with an additional accessory bulb sensor CRTEMPSN002A00). The accessory sensor must be mounted in the return airstream. (See Fig. 80.) Wiring is provided in the EconoMi$er IV wiring harness.
  • Page 62 Open Free Cool Fig. 82 - - EconoMi$er IV Control Differential Enthalpy Control For differential enthalpy control, the EconoMi$er IV controller uses two enthalpy sensors (HH57AC078 and CRENTDIF004A00), one in the outside air and one in the return air duct. The EconoMi$er IV controller compares the outdoor air enthalpy to the return air enthalpy to determine EconoMi$er IV use.
  • Page 63 Adjust the minimum position potentiometer to allow the minimum amount of outdoor air, as required by local codes, to enter the building. Make minimum position adjustments with at least 10_F temperature difference between the outdoor and return-air temperatures. To determine the minimum position setting, perform the following procedure: 1.
  • Page 64 (See Table 28.) Use setting 1 or 2 for Carrier equipment. (See Table 28.) 1. Press Clear and Mode buttons. Hold at least 5 seconds until the sensor enters the Edit mode.
  • Page 65 Table 29 – EconoMi$er IV Sensor Usage ECONOMI$ER IV WITH OUTDOOR AIR DRY BULB SENSOR APPLICATION Accessories Required Outdoor Air None. The outdoor air dry bulb sensor is Dry Bulb factory installed. Differential CRTEMPSN002A00* Dry Bulb Single Enthalpy HH57AC078 Differential HH57AC078 and CRENTDIF004A00* Enthalpy for DCV...

  • Page 66: Wiring Diagrams

    5. Turn the DCV setpoint potentiometer CW until the DCV LED turns off. The DCV LED should turn off when the potentiometer is approximately 9- - v. The actuator should drive fully closed. 6. Turn the DCV and Exhaust potentiometers CCW until the Exhaust LED turns on.
  • Page 67 C09156 Fig. 84 - - 48TC Typical Unit Wiring Diagram - - Power (D08, 208/230- - 3- - 60)

  • Page 69: Pre- -Start- - Up

    PRE- -START- - UP WARNING PERSONAL INJURY HAZARD Failure to follow this warning could result in personal injury or death. 1. Follow recognized safety practices and wear protective goggles when checking or servicing refrigerant system. 2. Do not operate compressor or provide any electric power to unit unless compressor terminal cover is in place and secured.
  • Page 70 WARNING UNIT OPERATION AND SAFETY HAZARD Failure to follow this warning could result in personal injury or death. Disconnect gas piping from unit when leak testing at pressure greater than 1/2 psig. Pressures greater than 1/2 psig will cause gas valve damage resulting in hazardous condition.

  • Page 71: Start- - Up, Premierlink Control

    - up and setpoints from a zone sensor or terminal control module. During start- - up, the Carrier software can also be used to verify communication with PremierLink controller. NOTE: All set- - up and setpoint configurations are factory set and field- - adjustable.
  • Page 72 Field Service Test mode has the following changes from normal operation: S Outdoor air temperature limits for cooling circuits, economizer, and heating are ignored. S Normal compressor time guards and other staging delays are ignored. S The status of Alarms (except Fire and Safety chain) is ignored but all alerts and alarms are still broadcasted on the network.
  • Page 73 Cooling/Econ SAT Low Setpt The supply air temperature must remain above this value to allow cooling with the economizer and/or compressors. There is 5_F plus and minus deadband to this point. If the SAT falls below this value during cooling, all compressors will be staged off.
  • Page 74 T55/56 Override Duration This sets the occupancy override duration when the override button is pushed on the space sensor. Factory Default = 1 hr Range = 0- - 24 hr IAQ Low Reference @ 4mA This is used when an IAQ sensor is installed on Input 1 or 2.

  • Page 75: Operating Sequences

    OPERATING SEQUENCES Base Unit Controls Cooling, Units Without Economizer When thermostat calls for Stage 1 cooling, terminals G and Y1 are energized. The indoor- - fan contactor (IFC), outdoor fan contactor (OFC) and Compressor 1 contactor (C1) are energized and indoor-fan motor, outdoor fan and Compressor 1 start.
  • Page 76 DCV operation is available in Occupied and Unoccupied periods with EconoMi$er IV. However, a control modification will be required on the 48TC unit to implement the Unoccupied period function. Supplemental Controls Compressor Lockout Relay (CLO) - - The CLO is available as a factory-installed option or as a field- - installed accessory.
  • Page 77 Routine No. 2: If DXLOCK (or DX Cooling Lockout is disabled) < OAT ≤ 68_F when Y1 input is energized, the economizer will be modulated to maintain SAT at SASP = SATLO1 + 3_F. If the SAT > SASP + 5_F and the economizer position >...
  • Page 78 Indoor Fan — The indoor fan will be turned on whenever any one of the following conditions are met: S If the PremierLink controller is in the occupied mode and ASHRAE 90.1 Supply Fan is configured for Yes in the CONFIG table.
  • Page 79 Table 30 – Available Cooling Stages NUMBER OF STAGES (ECONOMIZER*) Compressor 1 Compressor 2 * If conditions are suitable for economizer operation. Any time the compressors are running, the PremierLink controller will lockout the compressors if the SAT becomes too low. These user configurable settings are found in the SERVICE configuration table: Compressor 1 Lockout at SAT <...
  • Page 80 The maximum number of stages available is dependent on the type of heat and the number of stages programmed in the CONFIG and SERVICE configuration tables. Staging will occur as follows for gas electric units, Carrier heat pumps with a defrost board, or cooling units with electric heat: For Heating PID STAGES = 2 HEAT STAGES = 1 (50% capacity) - - energize HS1.
  • Page 81 There is also a SAT tempering routine that will act as SAT low limit safety to prevent the SAT from becoming too cold should the economizer fail to close. One stage of heating will be energized if it is not in the Cooling or Free Cooling mode and the OAT is below 55_F and the SAT is below 40_F.
  • Page 82 Temperature Compensated Start — This function will run when the controller is in unoccupied state and will calculate early start bias time (SBT) based on space temperature deviation from occupied setpoints in minutes per degree. The following conditions will be met for the function to run: S Unit is in unoccupied state S Next occupied time is valid...
  • Page 83 For more information on how the PremierLink controller is used in conjunction with the Carrier 3V control system, contact your CCN controls representative. IMPORTANT: The PremierLink controller should not be used as a linked air source in a ComfortIDt VAV system.
  • Page 84 The Holiday schedule is created to override the Daily schedule and identify a specific day and month of the year to start and stop the unit and change control to the unoccupied heating and cooling setpoints. Follow the same steps to turn on one of the twelve Holiday schedules and start and stop times.

  • Page 85: Fastener Torque Values

    Economizer The Economizer dampers are used to provide free cooling and Indoor Air Quality, if optional CO when the outside conditions are suitable. The following conditions must be true for economizer operation: S Indoor Fan has been on for at least 30 seconds. S Enthalpy is Low if the Enthalpy input is enabled.
  • Page 86 Supply fan motor mounting Supply fan motor adjustment plate Motor pulley setscrew Fan pulley setscrew Blower wheel hub setscrew Bearing locking collar setscrew Compressor mounting bolts Condenser fan motor mounting bolts Condenser fan hub setscrew Table 33 – Torque Values 120 ¦...

  • Page 87: Appendix I. Model Number Significance

    APPENDIX I. MODEL NUMBER SIGNIFICANCE Model Number Nomenclature 4 8 T C D D 0 8 A 1 A 5 -- 0 A 0 A 0 ____ ____ Unit Heat Type 48 = Cooling/Gas Heat RTU Tier / Model TC = Entry tier (with PuronR refrigerant) Heat Size D = Low heat E = Medium heat...

  • Page 88: Appendix Ii. Physical Data

    Cu / AI: Copper Tube / Aluminum Fin RTPF: Round Tube / Plate Fin 575V motor utilizes 3.7 BHP APPENDIX II. PHYSICAL DATA (Cooling) 48TC*D08 2 / 2 / Scroll 4--- 6 / 4--- 6 42 / 42 Accutrol 630 / 505...

  • Page 89: Physical Data

    APPENDIX II. PHYSICAL DATA (cont.) Physical Data Gas Connection # of Gas Valves Nat. gas supply line press (in. w.g.)/(PSIG) LP supply line press (in. w.g.)/(PSIG) Heat Anticipator Setting (Amps) 1st stage 2nd stage Natural Gas Heat, Liquid Propane Heat # of stages / # of burners (total) Connection size Rollout switch opens / Closes...

  • Page 90: Appendix Iii. Fan Performance

    APPENDIX III. FAN PERFORMANCE 48TC**08 2250 0.52 2438 0.62 2625 0.74 2813 0.88 3000 1.03 3188 1.21 3375 1.40 3563 1.61 3750 1.85 Medium Static Option 2250 1.81 2438 1.96 2625 2.12 2813 2.31 3000 2.51 3188 2.74 3375 2.99 3563 3.26 3750...
  • Page 91 48TC**12 Field---Supplied Drive 3000 0.70 3250 0.85 3500 1.03 3750 1.23 4000 1.45 4250 1.71 4500 1.99 4750 2.31 5000 2.66 3000 1.70 3250 1.93 3500 2.18 3750 2.46 4000 1011 2.76 4250 1037 3.09 4500 1064 3.46 4750 1091 3.85 5000 1120...
  • Page 92 48TC**14 3438 0.98 3750 1.23 4063 1.52 4375 1.85 4688 2.23 5000 2.66 5313 3.15 1012 5625 3.69 1009 4.30 5938 1058 6250 Medium Static Option 3438 2.12 1007 3750 2.46 1035 4063 1017 2.84 1066 4375 1050 3.27 1097 4688 1084 3.75...

  • Page 93: Pulley Adjustment

    APPENDIX III. FAN PERFORMANCE (cont.) Pulley Adjustment MOTOR/DRIVE UNIT COMBO Standard Static Medium Static High Static 1102 Standard Static Medium Static 1084 High Static 1240 Standard Static Medium Static 1084 High Static 1240 NOTE: Do not adjust pulley further than 5 turns open. - - Factory settings MOTOR PULLEY TURNS OPEN 1083...

  • Page 94: Electrical Information

    48TC*D08 VOLTAGE COMP (Cir 1) RANGE V ---Ph---Hz MIN MAX 208--- 3--- 60 13.6 230--- 3--- 60 13.6 460--- 3--- 60 575--- 3--- 60 48TC*D12 VOLTAGE COMP (Cir 1) RANGE V ---Ph---Hz MIN MAX 208--- 3--- 60 15.6 230--- 3--- 60 15.6...
  • Page 95 MCA/MOCP DETERMINATION NO C.O. OR UNPWRD C.O. COMBUSTION NOM. FAN MOTOR V ---Ph---Hz TYPE 208/230--- 3--- 60 0.48 HIGH 460--- 3--- 60 0.25 HIGH 575--- 3--- 60 0.24 HIGH 208/230--- 3--- 60 0.48 HIGH 460--- 3--- 60 0.25 HIGH 575--- 3--- 60 0.24 HIGH 0.48...

  • Page 96: Appendix Iv. Wiring Diagram List

    APPENDIX IV. WIRING DIAGRAM LIST Wiring Diagrams SIZE VOLTAGE 208/230---3---60 460---3---60 575---3---60 208/230---3---60 460---3---60 575---3---60 208/230---3---60 460---3---60 575---3---60 PremierLink* RTU ---MP* NOTE: Component arrangement on Control; Legend on Power Schematic * PremierLink and RTU- - MP control labels overlay a portion of the base unit control label. The base unit label drawing and the control option drawing are required to provide a complete unit control diagram.

  • Page 97: Appendix V. Motormaster Sensor Locations

    NOTE: The low ambient kit for the 12.5 ton unit utilizes a pressure transducer, and therefore there is no Motormaster temperature sensor location for this unit. Copyright 2009 Carrier Corp. S 7310 W. Morris St. S Indianapolis, IN 46231 Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

  • Page 98: Unit Start-Up Checklist

    I. PRELIMINARY INFORMATION: MODEL NO.: DATE: ______________ II. PRE-START-UP (insert check mark in box as each item is completed): VERIFY THAT ALL PACKAGING MATERIALS HAVE BEEN REMOVED FROM UNIT VERIFY THAT CONDENSATE CONNECTION IS INSTALLED PER INSTALLATION INSTRUCTIONS VERIFY THAT FLUE HOOD IS INSTALLED CHECK ALL ELECTRICAL CONNECTIONS AND TERMINALS FOR TIGHTNESS CHECK TO ENSURE NO WIRES ARE TOUCHING REFRIGERANT TUBING OR SHARP EDGES CHECK GAS PIPING FOR LEAKS...

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