Carrier Performance 48VG Ultra Low NOx Owner's Information Manual

48VG Ultra Low NOx: Owner’s Information ManualManufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.8A07797Fig. 7 – To Shut-off Unit Electric CoolingTo replace or inspect filters in accessory filter rack (See Fig. 2):1. Remove 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) isdirty, clean or replace with a new one.When installing the new filter(s), note the direction of the airflow arrowson the filter frame which should be pointing at the indoor coil.3. Reinstall filter access panel ensuring opening is air and water tight.If you have difficulty locating your air filter(s) or have questionsconcerning proper filter maintenance, contact your dealer forinstructions. When replacing filters, always use the same size and type offilter that was supplied originally by the installer. See Table 1 for filtersizes supplied with accessory filter rack.Fans and Fan MotorsPeriodically check the condition of fan wheels and housings and fanmotor shaft bearings. Contact your dealer for the required annualmaintenance.Heat ExchangerTo ensure dependable and efficient heating operation, the heat exchangershould be checked by a qualified maintenance person before eachheating season, and cleaned when necessary. This checkout should notbe attempted by anyone not having the required expertise and equipmentto properly do the job. Contact your dealer for the required periodicmaintenance.Indoor and Outdoor CoilsCleaning of the coils should only be done by qualified service personnel.Contact your dealer for the required annual maintenance.Condensate DrainThe drain pan and condensate drain line should be checked and cleanedat the same time the cooling coils are checked by your dealer.CompressorAll compressors are factory shipped with a normal charge of the correcttype of refrigeration grade oil.Condenser (Outdoor) FanThe fan must be kept free of all obstructions to ensure proper cooling.Contact your dealer for any required service.Electrical Controls and WiringElectrical controls are difficult to check without proper instrumentation.If there are any discrepancies in the operating cycle, contact your localdealer and request service.Refrigerant CircuitThe refrigerant circuit is difficult to check for leaks without the properequipment. If inadequate cooling is suspected, contact your local dealerfor service.Unit PanelsAfter performing any maintenance or service on the unit, be sure allpanels are fastened securely in place to prevent rain from entering unitcabinet and to prevent disruption of the correct unit airflow pattern.Combustion Area and Vent SystemFor proper and safe operation, the unit needs air for combustion andventilation. The air openings, on the unit, the air openings to the area inwhich the unit is installed, and the spacing around the unit must not beblocked or obstructed.The combustion air inlet area and vent hood should be inspected visuallybefore each heating season. The normal accumulation of dirt, soot, rust,and scale can result in loss of efficiency and improper performance ifallowed to build up. This inspection should be done by a trained serviceperson.90STEP 1 STEP 2CLOSESTEP 3OFFONMAINWARNING!PERSONAL INJURY AND UNIT DAMAGE HAZARDFailure to follow this warning could result in personal injury, death orproperty damage.Do not insert sticks, screwdrivers, or any other objects into revolvingfan blades.WARNING!EXPLOSION AND ENVIRONMENTAL HAZARDFailure to follow this warning could result in personal injury, death orproperty damage.System under pressure. Relieve pressure and recover all refrigerantbefore system repair or final unit disposal. Use all service ports andopen all flow-control devices, including solenoid valves.WARNING!FIRE, EXPLOSION HAZARDFailure to follow this warning could result in personal injury, deathand/or property damage.If your unit makes an especially loud noise when the main burners areignited, shut down the heating section and call your dealer.

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