Carrier Comfort 48VT Owner's Information Manual

3CUT HAZARDFailure to follow this caution may result in personal injury.When removing access panels or performing maintenancefunctions inside your unit, be aware of sharp sheet metalparts and screws. Although special care is taken to reducesharp edges to a minimum, be extremely careful whenhandling parts or reaching into the unit.! CAUTIONUNIT INTRODUCTIONThis unit is a small packaged gas heat/electric heat pump systemthat can utilize both the efficiency of heat pump heating and thecomfort of gas heating. The system will optimize for ideal heating,depending on several factors. This unit uses Puron, theenvironmentally balanced refrigerant, for cooling and heat pumpheating.Starting or Shutting Off UnitNOTE: Your combination heating/cooling unit is equipped withan 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.4 for location of gas valve. Refer to Fig. 4 while proceeding withthe following steps.1. Set the temperature selector on room thermostat to the low-est temperature setting and set system switch to EmergencyHeat.2. Close the external manual gas shutoff valve.3. Turn off the electrical supply to the unit.4. Remove the control access panel with a 5/16--in. nut driver.(See Fig. 2.)COMPRESSORACCESS PANELBLOWERACCESSPANELCONTROLACCESSPANELA170032Fig. 2 -- Unit Access Panels5. Move the selector switch on the internal gas valve to theOFF position and wait 5 minutes.6. Move the selector switch on the internal gas valve to the ONposition.7. Replace the control access panel.8. Turn on the electrical supply to unit.9. Open the external manual gas shutoff valve.10. Set the temperature selector on room thermostat slightlyabove room temperature to start unit. The induced--draftcombustion air fan will start. Main gas valve will open andmain burners should ignite within 5 seconds. If the burnerdoes not light within 5 seconds, the ignition module will gointo a Retry Mode after a period of approximately 22seconds (following the 5--second ignition period). If theburners do not light within 15 minutes of the initial call forheat, there is a lockout.11. Set the temperature selector on room thermostat to desiredsetting.FIRE AND EXPLOSION HAZARDFailure to follow this warning could result in personalinjury, death, and/or property damage.1. If the main burners fail to light, or the blower fails tostart, shut down gas heating section and call your dealer forservice.2. Never attempt to manually light the main burners on unitwith a match, lighter, or any other flame. If the electricsparking device fails to light the main burners, refer to thefollowing shutdown procedures, then call your dealer assoon as possible.! WARNINGBurners Gas ValveFlue HoodA170033Fig. 3 -- Gas Heating/Electric Cooling Unit with Access PanelRemovedTo shut off unit gas heat:FIRE, EXPLOSION, ELECTRICAL SHOCKHAZARDFailure to follow this warning could result in personalinjury, death, and/or property damage.Do not turn off the electrical power to unit without firstturning off the gas supply.! WARNINGNOTE: 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, shutoff the external manual gas valve to the unit before shutting offthe electrical supply. Do not use this unit if any part has been underwater. Immediately call a qualified service technician to inspect theunit and to replace any part of the control system and any gascontrol which has been under water.Refer to Fig. 5 while proceeding with the following steps.1. Set the temperature selector on room thermostat to lowesttemperature setting and set system SWITCH to OFF.