Carrier Comfort 50NT Owner's Information Manual

50NT: Owner’s Information ManualManufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.55. Inspection of the unit base to ensure that no cracks, gaps, etc., existwhich 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 properconnection.8. Inspection for leaks in the refrigerant circuit. Pressure andtemperature 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 thatcovers seasonal inspections. Ask for further details.Complete service instructions can be found in the unit Installation,Start-up and Service Instructions.Warranty CertificateYour unit has a limited warranty. Be sure to read the warranty carefullyto 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 sufficient airflow. Check the air filter for dirt. Check forblocked return or supply air grilles. Be sure they are open andunobstructed. If these checks do not reveal the cause, call your servicingdealer.If your unit is not operating at all, check the following list for easysolutions:( ) Check to be sure that your thermostat temperature selector is setbelow the indoor temperature during the cooling season or above theindoor temperature during heating season. Be sure the SYSTEM switchor MODE control is in the COOL or HEAT and not OFF.( ) If your unit still fails to operate, call your servicing dealer fortroubleshooting and repairs. Specify the model and serial numbers ofyour unit. (Record them in this manual in the space provided.) If thedealer knows exactly which unit you have, he may be able to offersuggestions over the phone, or save valuable time throughknowledgeable preparation for the service call.In Case of TroubleIf you perform the steps above and unit performance is stillNotes:1. The above list may not include all maintenance items. Inspection intervals may vary depending on climate and operating hours. Consult your HVAC dealer about a servicecontract for seasonal inspections.2. Do not use harsh chemicals or high pressure water on coils. More frequent rinsing is required for units near a sea coast.Table 2 – Maintenance ChecklistMonthly maintenance items and outdoor unit rinsing may be performed by the consumer. All other maintenance items and all service work must beperformed by a qualified service technician. Read all Warning labels.DESCRIPTION OF MAINTENANCE RECOMMENDEDINTERVALConsumer specific: Monthly AnnualInspect, clean, or replace air filter if filter is located indoors in return air duct. XClear away debris and vegetation near unit. XDealer specific:Inspect cabinet and basepan for damage. Replace panels, gaskets, and other components that are damaged or severelyrusted. Make sure precipitation has not entered indoor section of unit. XInspect electrical disconnect for proper function. Repair or replace as necessary. XInspect electrical wiring and connections. Tighten loose connections. Inspect and perform functional test of equipment asneeded to ensure proper function. Repair or replace damaged or overheated components and wiring. XInspect electric heater, if installed. Check for signs of overheating of elements, controls, and wiring. Make sure heaterelements are not broken or electrically shorted. XCheck refrigerant system subcooling and/or superheat (system dependent). XInspect inside of unit. Clean if debris is present. XInspect condenser coil. Clean if dust, dirt, or debris is present. Rinse unit with fresh water (see Note 2). XInspect condenser motor and fan for damage. Make sure fan spins freely. XInspect and clean blower assembly (includes blower housing, wheel, and motor). XInspect evaporator coil. Clean if dust, dirt, or debris is present (see Note 2). XIf unit is charged with R-454B refrigerant, inspect and test leak dissipation system. See Installation and ServiceInstructions for details. XClean condensate pan and drain lines (more frequent maintenance may be required in humid climates). XInspect airflow system (ductwork). Check for leaks and repair as needed. X

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