{"product_id":"wsx-7-ptcr-hard-start-resistor-new-style-made-by-samsuan","title":"WSX-7 PTCR hard start resistor Heavy Duty New style! Made by Samsuan","description":"\u003ch1\u003eWSX-7 PTCR hard start resistor Heavy Duty New style! Made by Samsuan\u003c\/h1\u003e\n\u003ch2\u003e\u003cspan style=\"background-color: rgb(255, 255, 0);\"\u003e\u003cstrong\u003eThis Part has a shipping delay If ordered today will not ship until July 9, 2026 Sorry for the inconvienance. \u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003ch3\u003eReplaces 310977.005, WSX-5, WSX-7,  PTCR hard start resistor Made by Samsuan,  Heavy Duty up to 5 ton AC\u003c\/h3\u003e\n\u003ch1\u003e\u003cstrong\u003eHARD START POTENTIAL RELAY  \u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch2\u003e\u003cspan style=\"background-color: rgb(255, 255, 0);\"\u003e\u003cstrong\u003eNOTE: This part is the Relay ONLY, No capacitor is sent when ordering this product, see pictures below of how to wire it in series. \u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003ch2\u003eReplaces WSX-3, WSX-5, WSX-7, 3107977.005,\u003c\/h2\u003e\n\u003ch2\u003e\u003cspan style=\"background-color: #ffff00;\"\u003eoften  used with \u003ca href=\"https:\/\/colemanhvacparts.com\/products\/43-53-mfd-220-250v-round-motor-start-capacitor-1?_pos=3\u0026amp;_sid=935666be1\u0026amp;_ss=r\"\u003e43-53\u003c\/a\u003e or \u003ca href=\"https:\/\/colemanhvacparts.com\/products\/coleman-run-cap-88-108-mfd-250v?_pos=3\u0026amp;_sid=6fc86b6a7\u0026amp;_ss=r\"\u003e88-108\u003c\/a\u003e start capacitor sold separately. \u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"background-color: #ffff00;\"\u003eIf your RV Air Conditioner makes the lights blink or pops the breaker when starting this PTCR will give it the extra boost of power that is needed so that does not happen \u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003e\u003cspan\u003eAT Industries discontinued the original WSX-7 that plugged into the top as they were having so many failures and so our company engineers replaced it with a heavy duty hard start capacitor and they have been working awesome. \u003cspan style=\"background-color: rgb(255, 255, 0);\"\u003eThey work the same except there is a wire between the capacitor and hard start relay now.\u003c\/span\u003e Here is what it looks like plugged in (below) \u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003ch3 class=\"gmail_default\"\u003e\u003cspan style=\"color: rgb(0, 0, 0); background-color: rgb(255, 255, 0);\"\u003e\u003cstrong\u003eYellow Wire power into capacitor then hook the black lead to the hard start relay then red wire back to the compressor, no special sequence as the power flows both ways through the hard start and capacitor. \u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cdiv class=\"gmail_default\"\u003e\n\u003cspan\u003eThe \u003c\/span\u003e\u003cstrong\u003eWSX-7 hard start kit\u003c\/strong\u003e\u003cspan\u003e is used in RV rooftop air conditioners and heat pumps. It’s compatible with Dometic, Coleman, and Duo Therm models. \u003c\/span\u003eThis kit ensures smooth operation and optimal performance for your air conditioner\u003cspan\u003e. \u003c\/span\u003e\u003cspan\u003e Help your air conditioner start efficiently without pulling excessive amps. 😊\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eA positive temperature coefficient resistor (PTCR) is a resistor that varies its resistance with its temperature. A resistor that changes its resistance characteristics as a function of its temperature is also called a thermistor. So the PTCR is technically a thermistor.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOn most newer RV air conditioner units, it is very common to burn out the start capacitor and PTCR (positive temperature coefficient resistor) when using the unit in hot\/humid conditions ...OR.... when you are stressing it by adding an additional load to the trailer 120VAC wiring, such as a hair dryer or microwave.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIn effect, it leaves no 'head room' for the capacitor to draw from when the compressor starts and calls for the extra voltage boost while the other appliances are drawing the excess amperage, so it burns out. It might not be a bad idea to carry an extra set of capacitors in your trailer as a safety measure.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eA positive temperature coefficient resistor (PTCR) is a resistor that varies its resistance with its temperature. A resistor that changes its resistance characteristics as a function of its temperature is also called a thermistor. So the PTCR is technically a thermistor.\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFigure 1 shows a PTCR wired in a circuit. Whenever a thermistor increases its resistance with an increase in temperature, it is said to have a positive temperature coefficient (PTC). If the thermistor decreases its resistance with an increase in its temperature, it is said to have a negative temperature coefficient (NTC).\u003c\/p\u003e\n\u003cdiv class=\"advertisement\" id=\"div-gpt-ad-article-body-sky-mobile\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003eFigure 2 illustrates graphs of resistance vs. temperature of both PTC and NTC coefficient resistors.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cdiv class=\"image left\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1071\/8320\/files\/IMG_0206_480x480.jpg?v=1655262671\" alt=\"\"\u003e\u003cbr\u003e\n\u003cdiv class=\"caption\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2\u003ePTCR APPLICATIONS\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003ePTCRs have been used in the HVACR industry for many years. They are made from a very pure semiconducting ceramic material.\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eBecause the PTCR has a positive temperature coefficient, resistance is very low over a wide range of low temperatures. However, when reaching higher temperatures, the resistance increases. These characteristics can be used when starting certain motors or compressors.\u003c\/p\u003e\n\u003cp\u003eMany times, PTCR devices are used in place of potential or current type starting relays. PTCRs can provide starting torque in permanent split capacitance (PSC) motors, when the condensing and evaporating pressures have been equalized somewhat during the off cycle.\u003c\/p\u003e\n\u003cp\u003eThe main advantage of this device is that it has no contacts, coils, or moving parts, thus requiring less maintenance. Also, it is simpler to troubleshoot.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003eWIRING IT IN\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eThe PTCR is wired in series to the run capacitor. Power Into --\u0026gt;capacitor--\u0026gt; Out to PTCR --\u0026gt; out of PTCR to power the compressor (see Photo above)\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eNOTE; Does not matter if the power runs to the capacitor first or the WSX resister first \u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWhen the cycling control closes, an inrush of starting current passes through the PTCR and the start winding because they are in series. This large starting current inrush happens because of the very low resistance of the PTCRs when they experience a low temperature. The starting current can actually bypass the run capacitor because it passes through the PTCR (which is in series with a run capacitor).\u003c\/p\u003e\n\u003cp\u003eOne function of the run capacitor is to cause a phase shift between the run and start windings during the starting and run cycles, which creates a torque. However, the run capacitor also has the ability to limit current flow through the start winding during the running cycle because of its capacitive reactance. With the PTCR in parallel with the run capacitor, large amounts of starting inrush current can pass through the PTCR and start winding for more starting power.\u003c\/p\u003e\n\u003cp\u003eThis high starting current passing through the PTCR causes it to increase in temperature rapidly. In less than half a second, the PTCR quickly increases in resistance, which pretty much stops the current flowing through it. The motor should now be up to speed and acting much like a PSC motor, with the run capacitor in series with the starting winding and in parallel with the run winding.\u003c\/p\u003e\n\u003cp\u003eAs long as there is voltage on the motor circuit, the PTCR stays hot and thus has very high resistance. It is actually out of the circuit when hot and has no function but to block current through itself.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003eTIME DELAY\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eTime delays are often designed into systems with a PTCR. This time delay is important to allow the PTCR to cool down to its initial temperature (low resistance) before the next motor restart. The PTCR must be cooled down; otherwise, the high current inrush or starting power may not last long enough for effective motor starting.\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eMany ice-making systems that employ a PTCR on their PSC compressor motors use a built-in, forced-off time from 2 to 3 minutes. This forced time delay, employed each time the compressor is cycled off (usually from a full bin), allows for a cool-down period for the PTCR.\u003c\/p\u003e\n\u003cp\u003eSome equipment manufacturers design a control scheme that energizes a solenoid during the off cycle. This solenoid allows pressures to equalize between high (condensing) and low (evaporating) pressures for easier starting. Ice machine manufacturers can simply energize the hot gas solenoid during the off cycle for pressure equalization purposes.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003eTROUBLESHOOTING\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eThe PTCR can be checked out easily. All you need is an ohmmeter.\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAfter examining the PTCR for cracks and making sure it is cooled down to room temperature, measure the resistance of the PTCR with your ohmmeter. Place the ohmmeter between both end tabs, or between one end tab and the center tab of the PTCF, depending on its design. \u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003e8–20 Ω (ohms) at room temperature\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eMost new ones fall around \u003cstrong\u003e10–15 Ω\u003c\/strong\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eRecord the room temperature value; compare it with manufacturer’s specifications for a resistance range. If the resistance falls outside of the manufacturer’s range of resistance, discard the PTCR and install a new one.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIf you measure:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003e0–2 Ω\u003c\/strong\u003e → shorted, stuck on\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eOL \/ infinite\u003c\/strong\u003e → open, burned out\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003e40+ Ω cold\u003c\/strong\u003e → degraded, will not pass enough inrush current\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eWildly changing readings while cold\u003c\/strong\u003e → cracked disc\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eAny of these = replace it.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan style=\"background-color: rgb(255, 128, 0);\"\u003eSAFETY NOTE\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan style=\"background-color: rgb(255, 128, 0);\"\u003e\u003cstrong\u003eThe surface of the PTCR will reach more than 200 degrees F when voltage has been applied to it. Take care when handling this device to prevent burns.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"Quinn","offers":[{"title":"Default Title","offer_id":39348077461570,"sku":"WSX-8","price":49.53,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1071\/8320\/products\/632691-3.jpg?v=1621469078","url":"https:\/\/hvacpartstore.com\/products\/wsx-7-ptcr-hard-start-resistor-new-style-made-by-samsuan","provider":"HVACpartstore","version":"1.0","type":"link"}