Carrier 48XT-A Air Conditioner User Manual
Contents
1. 48XT A Infinity 15 SEER Single Packaged HYBRID HEAT Dual Fuel System GD with Puron R 410A Refrigerant turn to the experts Owner s Information Manual Fig 1 Unit 48XT A NOTE TO EQUIPMENT OWNER For your convenience please record the model and serial numbers of your new equipment in the spaces provided This information along with the installation data and dealer contact information will be helpful should your system require maintenance or service UNIT INFORMATION INSTALLATION INFORMATION Model Date Installed Serial DEALERSHIP CONTACT INFORMATION Company Name ACCESSORIES List type and model Address Phone Number Technician Name NOTE TO INSTALLER This manual must be left with the equipment owner Note Installer This manual should be left with the equipment user SAFETY CONSIDERATIONS Improper installation adjustment alteration service maintenance or use can cause explosion fire electrical shock or other conditions which may cause death personal injury or property damage Consult a qualified installer service agency or your distributor or branch for information or assistance The qualified installer or agency must use factory authorized kits or accessories when modifying this product Refer to the individual instructions packaged with the kits or accessories when installing Follow all safety codes Wear safety glasses protecti2. quire additional oil Condenser Fan 4 WARNING PERSONAL INJURY AND UNIT DAMAGE HAZARD Failure to follow this warning could result in death personal injury and or property damage Do not insert sticks screwdrivers or any other objects into revolving fan blades The fan must be kept free of all obstructions to ensure proper cool ing Contact your dealer for any required service Electrical Controls and Wiring Electrical controls are difficult to check without proper instrumenta tion If there are any discrepancies in the operating cycle contact your local dealer and request service Refrigerant Circuit Therefrigerant circuit is difficult to check for leaks without the prop er equipment If inadequate cooling is suspected contact your local dealer for service 4 WARNING EXPLOSION BURN AND ENVIRONMENTAL HAZARD Failure to follow this warning could result in death personal injury and or property damage System under pressure Relieve pressure and recover all refrigerant before system repair or final unit disposal Use all service ports and open all flow control devices including solenoid valves Unit Panels After performing any maintenance or service on the unit be sure all panels are fastened securely in place to prevent rain from entering unit cabinet and to prevent disruption of the correct unit airflow pat tern Regular Dealer Maintenance In addition to the type of routine maintenance you mig
3. 4 while proceeding with the following steps 1 Set the temperature selector on UI to the lowest temperature setting and set system switch to Emergency Heat 2 Close the external manual gas shutoff valve 3 Turn off the electrical supply to the unit 4 Remove the front access panel with a 5 16 in nut driver 5 Move the selector switch on the internal gas valve to the OFF position and wait 5 minutes 6 Move the selector switch on the internal gas valve to the ON position 7 Replace the front access panel 8 Turn on the electrical supply to unit 9 Open the external manual gas shutoff valve 10 Set the temperature selector on UI slightly above room tem perature to start unit The induced draft combustion air fan will start Main gas valve will open and main burners should ignite within 5 seconds Ifthe burner does not light within 5 seconds the ignition module will go into a Retry Mode after a period of approximately 22 seconds following the 5 second ignition period If the burners do not light within 15 minutes of the initial call for heat there is a lockout 11 Set the temperature selector on Ul to desired setting TEE Filter Access Panel For Accessory Filter Rack Access Panels A09045 Fig 2 Accessory Filter Rack Access Panel Flue Hood Burners Gas Valve A09043 Fig 3 Gas Heating Electric Cooling Unit with Access Panel Removed Standar
4. E EXPLOSION ELECTRICAL SHOCK HAZARD Failure to follow this hazard warning could result in personal injury death and or property damage 1 Do not turn off the electrical power to unit without first turning off the gas supply 2 Before attempting to start the gas heating section familiarize yourself with all the procedures that must be followed A WARNING FIRE EXPLOSION HAZARD Failure to follow this warning could result in personal injury death and or property damage Do not attempt to light by hand UNIT INTRODUCTION This 48XT A unit is a small packaged HYBRID HEATO system that can utilize both the efficiency of heat pump heating and the comfort of gas heating The system will optimize for ideal heating depending on several factors This unit uses Puron the ozone friendly refrigerant for cooling and heat pump heating You may notice your two stage packaged HYBRID HEAT system runs for longer periods of time Nearly 80 of the time it s running it is operating in low stage and your indoor temperature will remain more consistent with fewer drafts better humidity control enhanced comfort and enhanced energy efficiency Starting or Shutting Off Unit Note Your combination heating cooling unit is equipped with an automatic direct spark ignition and power combustion blower To start unit gas heat Refer to Fig 2 for location of unit front access panel Refer to Fig 3 for location of gas valve Refer to Fig
5. STEP 3 STEP 2 STEP 1 Jan OE 10 y Lal No 5 OCF 9 6 4 6 o A A 5 5 IS e Fig 5 To Shut off Unit Gas Heat STEP 1 STEP 3 om Lele 6 Olmi STEP 5 MAIN AN S STEP6 STEP 7 STEP 8 A09135 Fig 6 To Start Unit Electric Cooling MAIN ON OFF STEP 1 STEP 2 STEP 3 A07797 Fig 7 To Shut off Unit Electric Cooling Turn to the Experts TO OBTAIN INFORMATION ON PARTS Consult your installing dealer or classified section of your local telephone directory under the Heating Equipment or Air Conditioning Contractors amp Systems heading for dealer listing by brand name Have available the Model No Series Letter amp Serial No of your equipment to ensure correct replacement part Copyright 2009 Carrier Corporation Edition Date 03 09 Catalog No OM48XT 01 Manufacturer reserves the right to change at any time specifications and design without notice and without obligation Replaces OM48 26 10
6. d unit shown Actual appearance is shown in Fig 2 A WARNING FIRE AND EXPLOSION HAZARD Failure to follow this warning could result in personal injury death and or property damage 1 If the main burners fail to light or the blower fails to start shut down gas heating section and call your dealer for service 2 Never attempt to manually light the main burners on unit with a match lighter or any other flame If the electric sparking device fails to light the main burners refer to the following shutdown procedures then call your dealer as soon as possible To Shut off Unit Gas Heat A WARNING FIRE EXPLOSION ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury death and or property damage Do not turn off the electrical power to unit without first turning off the gas supply Note If the unit is being shut down because of a malfunction call your dealer as soon as possible Should overheating occur or the gas supply fail to shut off shut off the external manual gas valve to the unitbefore shutting off the elec trical supply Do not use this unit if any part has been under water Immediately call a qualified service technician to inspect the unit and to replace any part of the control system and any gas control which has been under water Refer to Fig 5 while proceeding with the following steps 1 Set the temperature selector on UI to lowest temperature set ti
7. e Check for several easily solved problems If insufficient heating or cooling is suspected Check for sufficient airflow Check the air filter for dirt Check for blocked return air or supply air grilles Be sure they are open and unobstructed If these checks do not reveal the cause call your servicing dealer If your unit is not operating at all check the following list for easy solutions Check to be sure that the temperature specified by your User Interface is set below the indoor temperature during the cooling sea son or above the indoor temperature during heating season Be sure the User Interface is set to COOL or HEAT and not OFF If your unit still fails to operate call your servicing dealer for troubleshooting and repairs Specify the model and serial numbers of your unit Record them in this manual in the space provided If the dealer knows exactly which unit you have he may be able to offer suggestions over the phone or save valuable time through knowledgeable preparation for the service call In Case of Trouble If you perform the steps above and unit performance is still unsatis factory shut off the unit and call your dealer MAIN OFF STEP 1 ere mi ow ON Blo STEP 10 A09133 STEP 8 Fig 4 To Start Unit Gas Heat LO LO
8. en removing access panels or performing maintenance functions inside your unit be aware of sharp sheet metal parts and screws Although special care is taken to reduce sharp edges to a minimum be extremely careful when handling parts or reaching into the unit Air Filters The air filter s should be checked every 3 or 4 weeks and changed or cleaned whenever it becomes dirty Dirty filters produce exces sive stress on the blower motor and can cause the motor to overheat and shut down This unit must have air filters in place before it can be operated These filters can be located in one of at least two places In many ap plications the installer will provide return air filter grilles mounted on the wall or ceiling of the conditioned structure In the instance of filter grilles the filters can simply be removed from the grille and re placed The other typical application is an accessory filter rack installed in side the unit itself The following information is given to assist in changing filters used in these internal filter racks Table 1 indicates the correct filter size for your unit Refer to Fig 2 to access filters installed in the accessory filter rack Table 1 Air Filters Located Inside Unit For Replacement Purposes Unit Size Quantity Filter Size in mm 12x20x1 A24 A30 2 805X610x25 12x24x1 A36 A60 3 305x610x25 To replace or inspect filters in accessory filter rack See Fig 2 1 Re
9. erall system effi ciency and maintain your comfort level When your heat pump needs additional heat to keep you comfort able your thermostat will turn on the supplemental gas heat MAINTENANCE AND SERVICE This section discusses maintenance that should be performed on your system Most maintenance should be performed by your deal er You as the owner may wish to handle some minor maintenance for your new unit Routine Maintenance All routine maintenance should be handled by skilled experienced personnel Your dealer can help you establish a standard procedure To assure proper functioning of the unit flow of condenser air must not be obstructed from reaching the unit Clearance from the top of the unit is 48 in 1219 mm Clearance of at least 36 in 914 mm is required on sides except the power entry side 42 in 1067 mm clearance and the duct side 12 in 305 mm minimum clearance Maintenance and Care for the Equipment Owner Before proceeding with those things you might want to maintain yourself please carefully consider the following WARNING FIRE EXPLOSION ELECTRICAL SHOCKHAZARD Failure to follow this warning could result in personal injury death or property damage BEFORE SERVICING OR PERFORMING MAINTE NANCE ON YOUR UNIT 1 TURN OFF GAS SUPPLY TO YOUR UNIT 2 TURN OFF ELECTRICAL POWER TO YOUR UNIT y CAUTION CUT HAZARD Failure to follow this caution may result in personal injury Wh
10. ht be willing to perform your unit should be inspected regularly by a properly trained service technician An inspection preferably each year but at least every other year should include the following 1 Inspection and if required cleaning of the outdoor and indoor coils 2 Inspection and if required cleaning of the indoor coil drain pan 3 Inspection and cleaning of blower wheel housing and motor 4 Inspection of all supply air and return air ducts for leaks obstructions and insulation integrity Any problems found should be resolved at this time 5 Inspection of the unit base to ensure that no cracks gaps etc exist which may cause a hazardous condition 6 Inspection of the unit casing for signs of deterioration 7 Inspection of all electrical wiring and components to assure proper connection 8 Inspection for leaks in the refrigerant circuit Pressure check to determine appropriate refrigerant charge 9 Operational check of the unit to determine working conditions Repair or adjustment should be made at this time Your servicing dealer may offer an economical service contract that covers seasonal inspections Ask for further details Complete service instructions can be found in the unit Installation Start up and Service Instructions Warranty Certificate Your unit has a limited warranty Be sure to read the warranty care fully to determine the coverage for your unit Before you call for servic
11. move the filter access panel using a 5 16 in nut driver 2 Remove the filter s by pulling it out of the unit If the filter s is dirty clean or replace with a new one When installing the new filter s note the direction of the airflow ar rows on the filter frame If you have difficulty locating your air filter s or have questions concerning proper filter maintenance contact your dealer for in structions When replacing filters always use the same size and type of filter that was supplied originally by the installer 4 WARNING FIRE AND UNIT OPERATIONAL HAZARD Failure to follow this warning could result in death personal injury and or property damage Never operate your unit without filters in place An accumulation of dust and lint on internal parts of your unit can cause loss of efficiency Fans and Fan Motors Periodically check the condition of fan wheels and housings and fan motor shaft bearings Contact your dealer for the required annual maintenance Indoor and Outdoor Coils Cleaning of the coils should only be done by qualified service per sonnel Contact your dealer for the required annual maintenance Condensate Drain The drain pan and condensate drain line should be checked and cleaned at the same time the cooling coils are checked by your deal er Compressor All compressors are factory shipped with a normal charge of the cor rect type of refrigeration grade oil A compressor should rarely re
12. mponents Only trained and qualified personnel should install repair or service this equipment A WARNING FIRE EXPLOSION ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury death or property damage Do not use this unit if any part has been under water Immediately call a qualified service technician to inspect the unit and to replace any part of the control system which has been under water y CAUTION CUT HAZARD Failure to follow this caution may result in personal injury When removing access panels or performing maintenance functions inside your unit be aware of sharp sheet metal parts and screws Although special care is taken to reduce sharp edges to a minimum be extremely careful when handling parts or reaching into the unit A WARNING FIRE AND EXPLOSION HAZARD What to do if you smell gas 1 Do not try to light any appliance 2 Do not touch any electrical switch do not use any phone in your building 3 Leave the building immediately 4 Immediately call your gas supplier from a nearby phone Follow the gas supplier s instructions 5 If you cannot reach your gas supplier call the fire department A WARNING ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury and or death Before performing recommended maintenance be sure the main power switch to unit is turned off and lock out tag is installed A WARNING FIR
13. ng and set system SWITCH to OFF Close the external manual shutoff valve Turn off the electrical power supply to the unit Remove the front access panel nA A N position 6 Replace the front access panel To Start Unit Electric Cooling Refer to Fig 6 while proceeding with the following steps 1 Setthe temperature selector on Ul to highest temperature set ting and set system SWITCH to OFF Close the external manual shutoff valve Turn off the electrical power supply to the unit Remove the front access panel NN AeA U N position 6 Replace the front access panel 7 Restore electrical power to the unit and set system switch to COOL 8 Set the temperature selector on UI slightly below the room temperature to start unit To Shut Off Unit Electric Cooling Refer to Fig 7 while proceeding with the following steps 1 Set the temperature selector on UI to highest temperature set ting and set system SWITCH to OFF 2 Close the external manual shutoff valve Move the selector switch on the internal gas valve to the OFF Move the selector switch on the internal gas valve to the OFF 3 Turn off the electrical power supply to the unit Note Heat Pump heating mode procedure is similar to electric cooling mode except thermostat mode is HEAT and Ul must operate on first stage heating above the balance point that has been determined by the Dealer OPERATING YOUR UNIT The operation of yo
14. ur unit is controlled by the Infinity UI You simply program the Ul and it maintains the indoor temperature atthe level you select See UI manual for detailed instructions To better protect your investment and to eliminate unnecessary ser vice calls familiarize yourself with the following facts Step 1 Cooling Mode With the SYSTEM control set to COOL your unit will run in cool ing mode until the indoor temperature is lowered to the level you have selected On extremely hot days your unit will run for longer periods at a time and have shorter off periods than on moderate days Step 2 Hybrid Heating Mode Your HYBRID HEAT system combines the strengths of two heat ing sources an electric heat pump and a gas furnace A HYBRID HEAT system provides more control over your monthly energy bills by allowing you to choose the most economical method of heating As conditions change the system automatically switches between the two sources to maintain greater efficiency than with a single source heating system With the Ul control setto HEAT your unit will normally operate the electric heat pump until the room temperature is raised to the level you have selected If the demand for heat cannot be met by the elec tric heat pump your Ul control will automatically switch to gas heat until the call for heat is satisfied On colder days your system may automatically switch to gas heat as the primary heating source to maximize the ov
15. ve clothing and work gloves Have a fire extinguisher available Read these instructions thoroughly and follow all warnings or cautions included in literature and attached to the unit consult local building codes the current editions of the National Fuel Gas Code NFGC NFPA 54 ANSI Z223 1 and the National Electrical Code NEC NFPA 70 In Canada refer to the current editions of the National Standards 01 Canada CAN CSA B149 1 and 2 Natural Gas and Propane Installation codes and Canadian Electrical Code CSA C22 1 Recognize safety information This is the safety alert symbol A When you see this symbol on the unit and in instructions or manuals be alert to the potential for personal injury Understand these signal words DANGER WARNING and CAUTION These words are used with the safety alert symbol DANGER identifies the most serious hazards which will result in severe per sonal injury or death WARNING signifies hazards which could result in personal injury or death CAUTION is used to identify unsafe practices which may result in minor personal injury or product and property damage NOTE is used to highlight sugges tions which will result in enhanced installation reliability or op eration A WARNING FIRE EXPLOSION ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury death or property damage Installation and servicing of this equipment can be hazardous due to mechanical and electrical co
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