Carrier 50VT-B Owner's Information Manual

Also see for 50VT-B: Installation instructions

2SAFETY CONSIDERATIONSImproper installation adjustment, alteration, service, maintenance,or use can cause explosion, fire, electrical shock, or otherconditions which may cause death, personal injury, or propertydamage. Consult a qualified installer, service agency, or yourdistributor or branch for information or assistance. The qualifiedinstaller or agency must use factory--authorized kits or accessorieswhen modifying this product Refer to the individual instructionspackaged with the kits or accessories when installing.Follow all safety codes. Wear safety glasses, protective clothing,and work gloves. Use quenching cloth for brazing operations.Have a fire extinguisher available. Read these instructionsthoroughly and follow all warnings or cautions included inliterature and attached to the unit. Consult local building codes, thecurrent editions of the National Electrical Code (NEC) NFPA 70.In Canada refer to the current editions of the Canadian electricalCode CSA C22.1.Recognize safety information. This is the safety--alert symbol .When you see this symbol on the unit and in instructions ormanuals, be alert to the potential for personal injury. Understandthese signal words; DANGER, WARNING, and CAUTION. Thesewords are used with the safety--alert symbol. DANGER identifiesthe most serious hazards which will result in severe personal injuryor death. WARNING signifies hazards which could result inpersonal injury or death. CAUTION is used to identify unsafepractices which may result in minor personal injury or product andproperty damage. NOTE is used to highlight suggestions whichwill result in enhanced installation, reliability, or operation.NOTE: Installer: This manual should be left with the equipmentuser.FIRE, EXPLOSION, ELECTRICAL SHOCKHAZARDFailure to follow this warning could result in personalinjury, death, and/or property damage.Installation and servicing of this equipment can behazardous due to mechanical and electrical components.Only trained and qualified personnel should install, repair,or service this equipment.! WARNINGFIRE, EXPLOSION, ELECTRICAL SHOCKHAZARDFailure to follow this warning could result in personalinjury, death or property damage.Do not use this unit if any part has been under water.Immediately call a qualified service technician to inspect theunit and to replace any part of the control system which hasbeen under water.! WARNINGELECTRICAL SHOCK HAZARDFailure to follow this warning could result in personalinjury or death.Before performing recommended maintenance, be sure themain power switch to unit is turned off and a lock--out tag isinstalled. There may be more than one disconnect switch.! WARNINGCUT HAZARDFailure to follow this caution may result in personal injury.Sheet metal parts may have sharp edges or burrs. Use careand wear appropriate protective clothing, safety glasses andgloves when handling parts and servicing furnaces.! CAUTIONOPERATING YOUR UNITThe operation of your heat pump system is controlled by theindoor thermostat. You simply adjust the thermostat and itmaintains the indoor temperature at the level you select. Mostthermostats of heat pump systems have 3 controls: a temperaturecontrol selector, a FAN control, and a SYSTEM or MODE control.Refer to your thermostat owner’s manual for more information.To better protect your investment and to eliminate unnecessaryservice calls, familiarize yourself with the following facts:1. During heating, increasing the desired temperature settingmore than 2F (1.1C) may cause the supplemental heatersto be turned on for a short period of time to satisfy thedemand. Needless use of the supplementary heat reducespotential energy savings.2. Ice or frost tends to form on the coil during winter heatingoperation. Your unit is designed to automatically melt theice. When in this defrost cycle, it is normal for steam orfog to rise from the outdoor unit, and for water to drainfrom the outside of unit. Do not be alarmed!To start the unit:1. Turn on the electrical power supply to unit.2. Set MODE control to desired mode and select temperature.To shut off unit:NOTE: If the unit is being shut down because of a malfunction,call your dealer as soon as possible.1. Set system MODE control to OFF.2. Turn off the electrical power supply to unit.Cooling ModeWith the SYSTEM or MODE control set to COOL, your unit willrun in cooling mode until the indoor temperature is lowered to thelevel you have selected. On extremely hot days, your unit will runfor longer periods at a time and have shorter “off” periods than onmoderate days.Heating ModeWith the SYSTEM or MODE control set to HEAT, your unit willrun in heating mode until the room temperature is raised to thelevel you have selected. Of course, your unit will run for longerperiods to maintain a comfortable environment on cooler days andnights than on moderate ones.Supplemental HeatYour unit is your primary heating source. Your system may also beequipped with a supplemental heating source such as electric heat.On cold days and nights, your system will automatically turn onthe supplemental heat, as needed, in order to maintain the level ofcomfort you have selected.When your heat pump needs additional heat to keep youcomfortable your thermostat will turn on the supplemental heat (ifequipped).Defrost ModeWhen your unit is providing heat to your home or office and theoutdoor temperature drops below 45F (7.2C), moisture maybegin to freeze on the surface of the coil. If allowed to build up,this ice would impede airflow across the coil and reduce the