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Μέτρηση κατανάλωσης και παρακολούθηση
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<blockquote data-quote="BIOS" data-source="post: 1058023477" data-attributes="member: 256"><p><strong>Απάντηση: Re: Απάντηση: Μέτρηση κατανάλωσης και παρακολούθηση</strong></p><p></p><p></p><p></p><p>Most manufacturers of air conditioning require that the heater needs to be energized for 24 hours before start-up of the system. The compressor must have crankcase heat before start-up or damage will be done to the compressor.[2] The crankcase pressure of the compressor always drops when the compressor starts to turn.</p><p></p><p>A crankcase heater is an electrical component in a compressor in an air-conditioning system, heat pump system, or a chiller system. <u><strong>The crankcase heater is normally ON all the time even when the unit is not running</strong></u>, though temperature sensors and set points may be used to turn it off when not needed. A crankcase heater's sole purpose is to prevent refrigerant migration and mixing with crankcase oil, when the unit is off, and to prevent condensation of refrigerant in the crankcase of a compressor. The crankcase heater is designed to keep the refrigerant at a temperature higher than the coldest part of the system. A crankcase heater has the same electrical symbol as a resistor because it converts electricity directly into heat via electrical resistance. The resistance in the heater coil determines the heat it will produce when voltage is applied...</p><p>...</p><p></p><p><a href="http://enacademic.com/dic.nsf/enwiki/11367899" target="_blank">http://enacademic.com/dic.nsf/enwiki/11367899</a></p></blockquote><p></p>
[QUOTE="BIOS, post: 1058023477, member: 256"] [b]Απάντηση: Re: Απάντηση: Μέτρηση κατανάλωσης και παρακολούθηση[/b] Most manufacturers of air conditioning require that the heater needs to be energized for 24 hours before start-up of the system. The compressor must have crankcase heat before start-up or damage will be done to the compressor.[2] The crankcase pressure of the compressor always drops when the compressor starts to turn. A crankcase heater is an electrical component in a compressor in an air-conditioning system, heat pump system, or a chiller system. [U][B]The crankcase heater is normally ON all the time even when the unit is not running[/B][/U], though temperature sensors and set points may be used to turn it off when not needed. A crankcase heater's sole purpose is to prevent refrigerant migration and mixing with crankcase oil, when the unit is off, and to prevent condensation of refrigerant in the crankcase of a compressor. The crankcase heater is designed to keep the refrigerant at a temperature higher than the coldest part of the system. A crankcase heater has the same electrical symbol as a resistor because it converts electricity directly into heat via electrical resistance. The resistance in the heater coil determines the heat it will produce when voltage is applied... ... [url]http://enacademic.com/dic.nsf/enwiki/11367899[/url] [/QUOTE]
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