The principle of this numbering is to attach the component number to an electrical function. The functions are grouped in 8 families. Components have a four figure number e. g.: 4310. The first two figures indicate the function, the two following figures identify the component. The numbers for indicator lamps are preceded by the letter V e. g.: V2610. Free connectors which have a particular function (e. g. testing a function) are numbered as components with the letter � in front e. g.: C1300. The letters I� are used followed by a 2-digit identifying number. Application of an alphabetical index if the interconnections are identical, e. g: IC20, IC05A, IC05B. The letter � is used, followed by a 3 figure number, e. g: B001. Application of an alphabetical index if terminals are identical e. g: �00��, �00��. This code enables linking of the wire number to the type of supply or the electrical function. Supply is broken down as follows.

Example: BB2 (type of supply + wire identification number). Example: B02A (type of supply+ fuse number+ wire identification number, figure or letter). Example: M262 (type of supply+ wire identification number, figure or letter). Comments: each vehicle has special features in the coding of the wires concerning the supplies (they are handled as variants). Example: 2604 (function number+ wire identification number). These abbreviations are quoted on the terminals of certain components (e. g ignition switch). + BB: battery + ve. + AA: accessory + ve. + CC: ignition controlled + ve. + KK: + ve after ignition off. A: representation of an earth point. D: connector socket number. F: connector socket number. H: representation of information going to another function. I: number of the function involved. J: representation of a wire depending on vehicle specification. M: representation of a splice. O: fuse box diagram.

Q: number of interconnection ways. S: representation of a partial interconnection. T: representation of a splice. 1: identifying the harness shown. 2: identifying the equipment. 3: number of connector ways. 5: representation of an earth point. 6: representation of a splice. 7: identifying an interconnection. 8: identifying the harness connected. 9: for details see the box indicated. 10: location of the harness label.Scroll down this page to find definitions of some of the most common terminology used when referring to home comfort systems, or click on any of the links throughout the site to return to this page. AFUE% — Annual Fuel Utilization Efficiency. A measure of a furnace's heating efficiency. The higher the AFUE%, the more efficient the product. The government's established minimum AFUE rating for non-weatherized gas furnaces is 80%. Air Handler — The portion of the central air conditioning or heat pump system that moves heated or cooled air throughout a home's ductwork.

In some systems a furnace handles this function. Balance Point — An outdoor temperature, usually between 30° F and 45° F, at which a heat pump's output exactly equals the heating needs of the home. Btu — British thermal unit. Compressor — The pump that moves the refrigerant from the indoor evaporator coil to the outdoor condensing unit and back to the evaporator. how to clean drain pipe from ac unitThe compressor functions as the heart of the system, because it circulates the refrigerant in a loop.window ac unit horizontal Condensing/Outdoor Unit — The portion of a central air conditioning system that is located outside the home and functions as a heat transfer point for collecting heat from and dispelling heat to the outside air.what is dry mode on ac unit

Condenser Coil — A network of refrigerant-filled tubes where heat leaves the hot refrigerant vapor. The vapor then condenses into a liquid capable of absorbing more heat. Evaporator Coil — The portion of a heat pump or central air conditioning system that is located in the home and functions as the heat transfer point for warming or cooling indoor air. Heat Pump — An air conditioner that contains a valve that allows it to alternate between heating and cooling. Heat Source — A body of air or liquid from which heat is collected. With Luxaire® heat pumps, the air outside the home is used as the heat source during the heating cycle. HSPF — Heating Seasonal Performance Factor. A measure of a heat pump's heating efficiency. The higher the HSPF, the more efficient the product. There is no government established minimum HSPF rating for heat pumps. SEER — Seasonal Energy Efficiency Ratio. The government's established minimum SEER rating for air conditioners manufactured after January 2006 is 13.

Single Package — A year-round heating and air conditioning system that has all of the components completely encased in one unit outside the home. Split System — A heat pump or central air conditioning system with components located both inside and outside the home. The most common design for home use. Supplementary Heat — The auxiliary or emergency heat, usually electrical resistance heat, provided at temperatures below a heat pump's balance point.offers hundreds of practice questions and video explanations. Sign up or log in to Magoosh GMAT Prep.The outdoor coil of a heat pump can ice up just like a freezer evaporator. The tendency to ice up increases with humidity and low ambient temperatures. There is fortunately a convenient method of defrosting the outdoor coil. That is to make the system run in the cooling mode. The outdoor coil becomes the condenser and the ice can be melted away. To keep the heat where it is wanted the outdoor fan motor is temporarily shut off.

All this happens automatically and is controlled by a solid state defrost control board. Every so often it will check the temperatures of some thermisters (temperature sensitive resisters) and if a defrost is needed it will activate the defrost mode. Otherwise it will wait for the next trial for defrost. As the system progresses in a defrost it will get to the point where clouds of steam will billow out of the unit. New heat pump owners should be advised to expect this. Otherwise nuisance calls may be placed by the unknowing customer. They have even been known to call the fire department thinking the unit is on fire. In the piping diagram above, place the unit in the defrost mode (Button 2). Note that the outdoor coil has hot gas entering it which is going to condense into a liquid as it melts the ice build up. There is no danger to the compressor because this liquid must travel through a TXV and evaporator before getting back to the compressor. However simulate the end of a defrost by putting the system back into heating mode.