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Condenser
Fan
PERSONAL INJURY AND UNIT DAMAGE HAZARD
Failure to follow this warning could result in personalinjury,
death or property damage.
Do not poke sticks, screwdrivers, or any other object into
revolving fan blades.
!
WARNING
The fan mustbe kept free of all obstructions to ensure proper cool-
ing. Contact your dealer for any required service.
Electrical Controls and W
iring
Electricalcontrolsaredifficultto checkwithoutproperinstrumenta-
tion. If there a re any discrepancies in the operating cycle, contact
your local dealer and request service.
Refrigerant
Circuit
Therefrigerantcircuitisdifficulttocheckforleakswithouttheprop-
erequipment. Ifinadequate cooling issuspected, contactyour local
dealer for service.
EXPLOSION, BURN AND ENVIRONMENTAL
HAZARD
Failure to follow this warning could result in personalinjury,
death 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.
!
WARNING
Unit Panels
Afterperforming any maintenanceor service on theunit,besureall
panels are fastened securely in place to prevent rain from entering
unitcabinetand topreventdisruptionofthecorrectunitairflowpat-
tern.
Regular Dealer Maintenance
In addition to t he type of routine maintenance you might 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, cleaningof theindoor coildrain
pan.
3. Inspectionandcleaningofblowerwheelhousingandmotor.
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. Inspectionoftheunitbaseto ensurethatnocracks,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 therefrigerant circuit. Pressure check
to determine appropriate refrigerant charge.
9. Operational check of the unit to determine working
conditions.Repairoradjustmentshouldbemadeatthistime.
Your servicing dealermay offeran economicalservice contract that
covers seasonal inspections. Ask for further details.
Completeservice instructions can be found in the unit Installation,
Start--up and Service Instructions.
Warranty Certificate
Your 48XL --A unit has a limited warranty. Be sure to read the war-
ranty carefully to determine the coverage for your unit.
Before you call for service...
...check for several easily--solved problems.
If insufficient heating or cooling is suspected:
( ) Check for s ufficient a irflow . 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 besurethat thetemperature specified byyourUI isset
below the indoor temperature during the cooling season or above
theindoor temperature during heating season. Be sure the UI isset
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 manualin thespace 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
Ifyou perform the stepsaboveand unit performanceis still unsatis-
factory, shut off the unit and call your dealer.
HEA T ING & C OOLING
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 & Systems” heading for dealer listing by brand name.
Have available the Model No., Series Letter, & Serial No. of your equipment to ensure correct replacement part.
Copyright2009 CarrierCorporation Edition Date: 03/09
Catalog No: OM48XL---01
Replaces: OM48--- 25
Manufacturer reserves the rightto change, at any time,specificati ons and design withoutnotic e and without obligation.