Carrier 48XT-A Installation Instructions Manual
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Carrier 48XT-A Installation Instructions Manual

Carrier 48XT-A Installation Instructions Manual

Infinityt 15 seer single-packaged hybrid heat dual fuel system with puron (r-410a) refrigerant 2 to 5 nominal tons (sizes 24-60)
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48XT---A
Infinityt 15 SEER
Single---Packaged HYBRID HEAT
®
With Puron
(R---410A) Refrigerant
2 to 5 Nominal Tons (Sizes 24---60)
WARNING
!
EQUIPMENT OPERATION HAZARD
OAT sensor must be field installed. See Accessory
Installation for more details.
WARNING
!
EQUIPMENT OPERATION HAZARD
This Infinityt unit is designed for use with an Infinity User
Interface.
NOTE:
Read the entire instruction manual before starting the
installation.

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Summary of Contents for Carrier 48XT-A

  • Page 1: Table Of Contents

    48XT---A Infinityt 15 SEER Single---Packaged HYBRID HEAT ® Dual Fuel System ® With Puron (R---410A) Refrigerant 2 to 5 Nominal Tons (Sizes 24---60) Installation Instructions WARNING EQUIPMENT OPERATION HAZARD OAT sensor must be field installed. See Accessory Installation for more details. WARNING EQUIPMENT OPERATION HAZARD This Infinityt unit is designed for use with an Infinity User...

  • Page 2: Safety Considerations

    Check all items against shipping list. Immediately notify the erty damage. NOTE is used to highlight suggestions which will nearest Carrier office if any item is missing. To prevent loss or result in enhanced installation, reliability, or operation. damage, leave all parts in original packages until installation.

  • Page 3: Slab Mount

    SLAB MOUNT 1. Application of the lifter to the load, and adjustment of the Place the unit on a solid, level concrete pad that is a minimum of 4 lifts to adapt to various sizes or kinds of loads. in. (102 mm) thick with 2 in. (51 mm) above grade. The slab 2.
  • Page 4 HVAC unit HVAC unit basepan base rails Sealing Gasket Roofcurb Anchor screw Wood nailer* Flashing field supplied Roofcurb* Insulation (field supplied) Roofing material field supplied Cant strip field supplied SMALL CURB A09110 *Provided with roofcurb A09090 ROOF CURB DETAIL LARGE CURB A09095 A09111 CATALOG...
  • Page 5 A09150 Fig. 5 - - 48XT- -A24- -30 Unit Dimensions...
  • Page 6 A09151 Fig. 6 - - 48XT- -A36- -60 Unit Dimensions...
  • Page 7 Table 1 – Physical Data - - Unit 48XT- -A UNIT SIZE A40040 A30040 A30060 A36060 A36090 A42060 A42090 NOMINAL COOLING CAPACITY (ton) 2 ---1/2 2 ---1/2 3 ---1/2 3 ---1/2 NOMINAL HEATING CAPACITY (Btu) 40,000 40,000 60,000 60,000 90,000 60,000 90,000 SHIPPING WEIGHT (lb)

  • Page 8: Select And Install Ductwork

    Table 1—Physical Data Con’t - - Unit 48XT- -A UNIT SIZE A48090 A48115 A48130 A60090 A60115 A60130 NOMINAL COOLING CAPACITY (ton) NOMINAL HEATING CAPACITY (Btu) 90,000 115,000 130,000 90,000 115,000 130,000 SHIPPING WEIGHT (lb) (kg) Two- -Stage Scroll COMPRESSORS Quantity REFRIGERANT: PURON (R- - 410A) Quantity (lb) 15.5...

  • Page 9: Converting Horizontal Discharge Units To Downflow (Vertical) Discharge Units

    CAUTION - NOTICE TO RIGGERS PRUDENCE - AVIS AUX MANIPULATEUR ACCESS PANELS MUST BE IN PLACE WHEN RIGGING. PANNEAUX D'ACCES DOIT ÊTRE EN PLACE POUR MANIPULATION. Use top skid as spreader bar. / Utiliser la palette du haut comme barre de répartition DUCTS MINIMUM HEIGHT: 36"...

  • Page 10: Provide For Condensate Disposal

    4. If the unit ductwork is to be attached to vertical opening Install the flue hood as follows: flanges on the unit base (jackstand applications only), do so 1. This installation must conform with local building codes at this time. and with the National Fuel Gas Code (NFGC), NFPA 54 /ANSI Z223.1- -2006 (in Canada, CAN/CSA B149.1, and CAUTION...

  • Page 11: Install Gas Piping

    4. The use of copper tubing for gas piping is NOT approved by the state of Massachusetts. In the absence of local building codes, adhere to the following pertinent recommendations: 1. Avoid low spots in long runs of pipe. Grade all pipe 1/4 in. for every 15 ft (4.6 m) of length to prevent traps.

  • Page 12: Install Electrical Connections

    Table 2 – Maximum Gas Flow Capacity* LENGTH OF PIPE ft (m)† NOMINAL INTERNAL IRON PIPE DIAMETER SIZE (IN.) (IN.) (3.0) (6.1) (9.1) (12.1) (15.2) (18.3) (21.3) (24.4) (27.4) (30.5) (38.1) (45.7) (53.3) (61.0) .622 — — .824 1.049 1--- 1/4 1.380 1400 1--- 1/2...

  • Page 13: Accessory Installation

    ACCESSORY INSTALLATION B. Humidifier Connections A. Outdoor Air Temperature Sensor (OAT) The furnace control board terminal marked HUM is provided for low voltage (24- -vac) control of a humidifier. No humidistat is CAUTION required as UI monitors indoor humidity. When commanded to operate humidifier, the unit control will energize the HUM output to turn humidifier on and de- -energize EQUIPMENT OPERATION HAZARD HUM output to turn humidifier off.
  • Page 14 GROUND SCREW (IN SPLICE BOX) GROUND LEAD SINGLE-PHASE CONNECTIONS TO DISCONNECT PER NEC NOTE: Use copper wire only. LEGEND NEC – National Electrical Code Field Wiring Splice Connections A06299 Fig. 13 - - Line Power Connections HP/AC BOARD FURNACE BOARD A09108 Fig.

  • Page 15: Pre- -Start- -Up

    Infinity Furnace A06301 Fig. 15 - - Control Voltage Wiring Connections PRE- -START- - UP 1. Remove all access panels. 2. Read and follow instructions on all DANGER, WARNING, WARNING CAUTION, and INFORMATION labels attached to, or shipped with unit. 3.

  • Page 16: Unit Start- -Up And Troubleshooting

    5. Compressors are internally spring mounted. Do not loosen 2. Check ABCD connection on both boards. or remove compressor holddown bolts. 3. Check fuse on furnace board to be sure it is not blown. If 6. Each unit system has two Schrader- -type ports, one fuse is open, check system wiring before replacing it to be low- -side Schrader fitting located on the suction line, and sure a short does not cause a failure of replacement fuse.
  • Page 17 A06026 Fig. 16 - - Detail of Furnace Board D. Furnace Control Troubleshooting STATUS CODE 14 - - IGNITION LOCKOUT Control will auto reset after three hours. Refer to status code 34. Furnace control faults indicated by flashing codes on the amber system STATUS LED can be resolved using troubleshooting STATUS CODE 15 - - BLOWER MOTOR LOCKOUT information provided below.
  • Page 18 A09080 Fig. 17 - - Wiring Schematic- -48XT- -A Single Phase Gas Inputs 040, 060, 090 kBtu/hr...
  • Page 19 A09081 Fig. 18 - - Wiring Schematic- -48XT- -A Single Phase Gas Inputs 115, 130 kBtu/hr...
  • Page 20 UTILITY RELAY Liquid Line Solenoid UTILITY SIGNAL OPEN RELAY SUPPLIED BY UTILITY PROVIDER A05247 Fig. 19 - - 2- -Stage HP/AC Control Board STATUS CODE 23 - - PRESSURE SWITCH DID NOT OPEN inadequate flame carryover or rough ignition, or green/yellow wire Check for obstructed pressure tubing or pressure switch stuck must be connected to unit sheet metal.

  • Page 21: Sequence Of Operation

    Sequence of Operation Second stage heat pump will run until call for heat is satisfied or for fifteen minutes. If after 15 minutes the call for heat still exists, The 48XT- -A Hybrid Heat unit is designed for installation with a the unit will stage to first stage gas.
  • Page 22 Table 4 – Heat Pump/Air Conditioner Board Status Codes AMBER FAULT POSSIBLE CAUSE AND ACTION OPERATION FLASH CODE Standby – no call for unit opera- On solid, None Normal operation. tion no flash Rapid, con- Unit being controlled by standard thermostat inputs instead of Infin- Standard Ther- Emergency Mode tinuous...
  • Page 23 S Five minute time delay to start heat pump cooling or heating AUTO defrost adjusts the defrost interval time based on the last defrost time as follows: operation when there is a call from the thermostat or user S When defrost time <3 minutes, the next defrost interval=120 interface.
  • Page 24 GAS HEAT MODE AND ADJUSTMENTS WARNING When the UI calls for gas heat, the Infinity furnace board performs a self- -check, verifies the pressure switch is open, and starts the inducer on high speed. FIRE HAZARD 1. Inducer Pre- -purge Period: When the inducer motor comes Failure to follow this warning could result in personal up on high speed, the pressure switch closes, and the injury, death and/or property damage.
  • Page 25 Table 5 – Altitude Derate Multiplier for U.S.A.* 3. Verify natural gas low stage input rate. a. Turn off all other gas appliances and pilots served by Derate Multiplier Altitude ft (m) Percent of Derate the gas meter. Factor{ b. If unit is not running, set unit to run for 20 minutes in 0- - 2000 1.00 (0- - 610)
  • Page 26 b. If unit is not running, set unit to run for 20 minutes in high stage gas heat operation using the ”INSTALLER CHECKOUT” menu on the User Interface. c. Record number of seconds for gas meter to complete one revolution. d.

  • Page 27: Check For Refrigerant Leaks

    Table 6 – Heating Inputs GAS SUPPLY PRESSURE (IN. WC) MANIFOLD PRESSURE (IN. WC) HEATING INPUT (BTU/HR)* NUMBER OF NUMBER OF Natural Natural ORIFICES ORIFICES High Stage Low Stage High Stage Low Stage 40,000 26,000 13.0 3.2∼ 3.8 1.4 ∼ 2.0 60,000 39,000 13.0...

  • Page 28: To Use Cooling Charging Charts

    line and insulate it so that the outdoor ambient does not affect the established with the UI, the Infinity furnace board will enable the reading. Indoor air CFM must be within the normal operating standard thermostat input terminals to allow simple thermostatic range of the unit.
  • Page 29 A09109 Fig. 24 - - Cooling Charging Table- -Subcooling Table 7 – ECM Wet Coil Pressure Drop (in. w.c.) STANDARD CFM (SCFM) UNIT SIZE 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 0.005 0.007 0.010 0.012 0.015 –...

  • Page 30: Maintenance

    MAINTENANCE 7. Inspect all accessories. Perform any service or maintenance to the accessories as recommended in the accessory To ensure continuing high performance, and to minimize the instructions. possibility of premature equipment failure, periodic maintenance Air Filter must be performed on this equipment. This HYBRID HEAT unit should be inspected at least once each year by a qualified service IMPORTANT: Never operate the unit without a suitable air filter person.

  • Page 31: Inducer Pressure Switch

    Inducer Pressure Switch Inspect pressure switch connections. Inspect pressure switch tube for cracks or restrictions. Replace if needed. WARNING ELECTRICAL SHOCK HAZARD Infinity Top Failure to follow this warning could result in personal A06035 injury or death. “A” DIM. IN. (MM) Disconnect and tag electrical power to the unit before UNIT SIZE cleaning and lubricating the blower motor and wheel.

  • Page 32: Loss- -Of- -Charge Switch

    Loss- -of- -Charge (Low Pressure) Switch REFRIGERANT This switch is located on the liquid line and protects against low WARNING suction pressures caused by such events as loss of charge, low airflow across indoor coil, dirty filters, etc. It opens if the system pressure drops to about 20 psig.

  • Page 33: Troubleshooting

    TROUBLESHOOTING If the HP/AC control board has failed, the control will flash the appropriate fault code (See Table 4). The control board should be LED DESCRIPTION replaced. LEDs built into Infinity control boards provide installer or service BROWN OUT PROTECTION person information concerning operation and/or fault condition of If the line voltage is less than 187v for at least 4 seconds, the the unit controls and ECM motor.

  • Page 34: Final Checks

    TEMPERATURE THERMISTORS If the OAT sensor should fail, low ambient cooling will not be allowed and the one- -minute outdoor fan off delay will not occur. Thermistors are electronic devices which sense temperature. As the Defrost will be initiated based on coil temperature and time. temperature increases, the resistance decreases.
  • Page 35 HEAT PUMP WITH PURON REFRIGERATION SECTION QUICK- - REFERENCE GUIDE Puron refrigerant operates at 50- -70 percent higher pressures than R- -22. Be sure that servicing equipment and replacement components are designed to operate with Puron. Puron refrigerant cylinders are rose colored. S Puron refrigerant cylinders manufactured prior to March 1, 1999, have a dip tube that allows liquid to flow out of cylinder in upright position.
  • Page 36 Table 9 – Troubleshooting Chart- -Heat Pump Operation SYMPTOM CAUSE REMEDY Power failure Call power company Fuse blown or circuit breaker tripped Replace fuse or reset circuit breaker Defective contactor, transformer, HP/AC control board, Replace component or high--pressure, loss--of--charge or low--pressure switch Insufficient line voltage Determine cause and correct...
  • Page 37 Table 11 – Troubleshooting Chart- -Gas Furnace Operation SYMPTOM CAUSE REMEDY Water in gas line Drain. Install drip leg. Check power supply fuses, wiring or circuit No power to unit breaker. Check transformer. NOTE: Some transformers have internal over-- No 24--v power supply to control circuit current protection that requires a cool--down peri- od to reset.

  • Page 38: Start- -Up Checklist

    * Measured at suction inlet to compressor { Measured at liquid line leaving condenser. Catalog No:48XT ---04SI Copyright 2009 Carrier Corp. D 7310 W. Morris St. D Indianapolis, IN 46231 Printed in U.S.A. Edition Date: 03/09 Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

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