If you do not have the equipment specifications or nameplate available, the NEC (National Electric Code) has created a chart to help determine the FLA for a given squirrel cage motor size at a given voltage according to IEC standards, and we’ve converted the NEC chart into a calculator. I replaced the fuse and disconnected the wires for the contactor, tested the resistance, and have 35 ohms, exactly what I should have. So, I went to start it yesterday, and nothing. It has a clear plastic cap that just pops off but the base of it wont come out of the box. (See manufacturing data) Stock 70 amp contactor Performance 200Amp Contactor Stock 70 amp contactor Performance 200Amp Contactor Stock OEM 100 amp contactor the current the contactor can safely disconnect) is rated as 75amps, but with higher temperatures, this rating is obviously reduced with plain copper contacts. Well tonight, randomly, the ac shut off. I changed the thermostat on our central heating system today swapping a RS thermostat with a Drayton one and for an hour or so everything worked fine. Gaztech. What is my next step? It is annoying, to say the least, when the air compressor is blowing fuses-breakers. This problem, although minor, must be fixed by a tech). Blown 3 Amp Fuse in AC quick fix - Save $300-$500 - YouTube I never saw the little fuse box connected to the positive battery cable until now. I do not know if the fuse blew during operation, shutdown, or when the next request for cool happened. YOLISTIC (Pack of 10) 12 Amp Slow-Blow Time Delay Fuse Ceramic 6x30mm . Remove all the POWER and RECTIFIER tubes ** (See Note 2 below). DIY and save $300-$500. Power is ran through a 240v 3 phase 60 amp breaker, currently the breaker is running 50 amp fuses. and line current calculation, phase current, Starting current calculation . The most common mistake we see is incorrectly choosing AC-3 when AC-4 would be more appropriate, resulting in a shorter lifespan of the contactor. L3 fuse is good. I measured the electrical resistance on low voltage side of the contactor and it is only 2.3 ohms. Where should I start my search? I have replaced the control board, contactor and the transformer. Motors are what we call “inductive” loads, meaning there is an induced voltage due to the rotational effects of the motor. Can anyone tell me what the specification is? I have checked all leads/cables in the airing cupbaord are not pinched/uninsualted and there are no water leaks evdient. Any ideas on what connectors to image-235.jpg image.jpg unplug on the power driver board or other areas to test the boot up? Blower Motor – A failing blower motor draws too much power and may cause a short. Obtain a fuse. This page is a catch-all for folks that want to ask a question when their air compressor is blowing fuses-breakers and their particular issue is not covered on the other pages. FREE Shipping. Unless I am missing something, at 2.3 ohms it would draw more power than a 3 amp fuse can provide. ... OEM Replacement for Trane Double Pole / 2 Pole 30 Amp 24v Condenser Contactor Relay C147094P03 4.8 out of 5 stars 22. How long have you been dealing with this? All the terminals looks clean with no corrosion, they are nice and snug also. Adding additional contacts to a contactor is inexpensive and could save you time and money if you take the time to review the operation as a whole. I am still popping fuses and reading over 24 volts. I know the T-stat wire was good, replaced all new. I found something!!! Price $116.68. If you have a gas-fired furnace, disregard this. I did some researching and found out it was the 3A fuse. 99. Replaced contactor and 3 amp fuse and still blowing fuse. Compstudio 10Pcs F12AL250V 6X30MM 12A Fast Blow Fuse 12 Amp 250V F12AL Glass Fuse Fast-Acting Fuse (1/4" x 1-1/4") 3.5 out of 5 stars 2. Next. I replaced the fuse to see if it would blow open again but it didn't. Can you help? shunt motors), Switching of highly inductive loads (i.e. Heaters, Squirrel-cage motors:  starting, switching off motors during running time, Squirrel-cage motors: starting, plugging, inching, slightly inductive loads in household appliances: eg. Basic Calculation of Motor Torque… - the F3 4 amp fuse keeps blowing - the T3 Resistor looks bad (see pic) So could the T3 Resistor (if bad) cause the F3 to blow? Generally, coil voltages are 250V or below. Our boiler has no fan so I presume it is the pump. This is important because these will in part, determine which contactor you use. The fuse would blow when the unit shut down after a cycle or two, that suspect me to check anything that’s working at the end of the heating cycle. If the wiring is shorted, the contactor is stuck or the contactor coil is bad, this could cause the fuse to blow. Took the panel off, and the fuse was blown again. Heating & Air Conditioning Contractor. current rating (i.e. Another consideration is whether the motor operation requires reversing of the direction, in which case a reversing contactor would be required. We see this on occasion with contactors that become stuck in the open position due to corrosion or objects becoming stuck in the contact points. After a while the A/C turned off. 1 #2 7 years ago JEF. There are two main types of fuses: cylindrical and plug fuses. Hey, I have exhausted my troublshooting ability...I need some direction. Quick way to find out why our Low voltage fuse is blown .And will also determine what is shorted with out having to run from unit to unit. Fans, central vacuum, Hermetic refirgerant compressor motor control with manual resetting overloads, Hermetic refirgerant compressor motor control with automatic resetting overloads, Control of resistive loads and solid state loads with opto-coupler isolation, Control of solid state loads with transformer isolation, Connecting and disconnecting under no-load conditions, Switching of resistive loads; including moderate overloads, Switching of mixed resistive & inductive loads, including moderate overloads, Switching of motor loads or other highly inductive loads, Protection of circuits, with no rated short-time withstand current, Protection of circuits, with a rated short-time withstand current, Non Inductive or slightly inductive loads, resistance furnaces, heaters, Shunt-motors, starting, plugging(1), inching(2), dynamic braking of motors, Series-motors, starting, plugging(1), inching(2), dynamic braking of motors, Control of D.C. electromagnetic loads having economy resistors in the circuit, Switching of resistive loads, including moderate overloads, Switching of mixed resistive and inductive loads, including moderate overloads (i.e. Weak with electric and weak using meter. current rating (i.e. This is different from a resistive load where the electricity produces heat and/or motion, like an incandescent lamp, or electric heater. Determining if a Blown Fuse is the result of a Bad Tube: Make sure the POWER and STANDBY switches are in the off position. I have replaced the fuse and after the heat is on for awhile the fuse will blow and then I have cool air blowing. Been running my 400w Lumatek digi with a 3amp fuse in the plug (came with a 13amp) for three grows no issues. The unit fired RIGHT up and ran solid for about 5 minutes .... then blew the fuse again. An ampere, or its abbreviation "amp", is a unit that is used to measure electrical current. If you were to put a 4 amp 50 volt time-delay fuse in it's place, you would still provide short-circuit protection while bypassing this slight(ish) problem. Since P is based on your devices power requirements, it will remain constant, if you lower the voltage, the current must increase to balance the equation, and vice versa. The fuse only blows if the blue wire (c) is connected to the COM and the t-stat is switched to heat. An incorrectly specified IEC contactor may work for a period of time, but the lifespan will be severely reduced. I replaced it and it blew again immediately. 2 days. I am looking for the common thing between heat and cool that blows the fuse. So, a few months ago my AC wouldn't kick on nor the fan or furnace. Every furnace circuit board has an inducer and if it is faulty it can cause a fuse to keep blow continuously. Model #CB29M-41-2P AIR HANDLER. I checked and the furnace was off, fuse blown and thermostat was asking for cool. This turned out to be true. The unit was off and the 3 amp fuse was blown. Only 8 left in stock - order soon. #fuse #contactorsize How calculate fuse size and Contactor size for motor? Calculate Size of each Part of Star-Delta starter for 10HP, 415 Volt Three Phase Induction Motor having Non Inductive Type Load, Code A, Motor efficiency 80%, Motor RPM 600, Power Factor 0.8. $7.99 $ … You should next confirm the control voltage to be used to power the contactor. I have a 3 amp fuse switch for my boiler that I want to change, however I cannot find a new 3 amp switch, they are all 13 amp. Generally speaking with motors and other industrial equipment, you want to look at the nameplate to confirm the input voltage and the Full Load Amperage (FLA). After blowing the 3 amp fuse on my furnace board several times trying to troubleshoot the issue, I just replaced the contactor coil on my outdoor unit. Now even a 5 amp fuse blows when system starts. Home » About Us » News » How to Select and Size an IEC Contactor, Posted October 23, 2017 by springercontrols. This is significant difference. A good example for using auxiliary contacts would be turning on a pilot light to indicate the motor is running. CompStudio 10Pcs/lot T3AL250V 3A Slow Blow Fuse 5x20mm 250V 3 Amp Glass Tube Fuse Time Delay Fuse (3/16 in x 3/4 in) 4.2 out of 5 stars 13. 6 years college. Hey, I have exhausted my troublshooting ability...I need some direction. ... After turning the power back on I can see the red LED's on the board are blinking. With a good fuse in the AC work fine and you can switch the fan from Auto to Fan on with no problem. Choosing the right utilization code will extend the life of the contactor. IEC uses utilization categories, or “codes”, to describe specifically the type of electrical load and duty cycle of the load(s). Current can be defined as a count of the number of electrons running through a circuit. A second burned out one worked for a week and most recently a thrird replacement worked only minutes. So I went and checked the fuse.. and it was blown. Choose your motor horsepower, input voltage and single or 3 phase from the drop downs and the calculated full load amperage is displayed. BRYANT Furnace blowing 3-amp fuse on control board [ 1 Answers ] I have a Bryant M/N 383KAV036070AGJA, S/N 3097A08913, Series G furnace with central air that is blowing the 3-amp fuse on the control board. Discussion in 'Plumbers' Talk' started by Matt Vernon, Nov 12, 2016. Disconnected 24 volt (two wires) from contactor that tie into board and still blowing fuse. Help! Status Not open for further replies. I'm far from an electrical expert so I checked the fuse, and sure enough, its blown. The replaced fuse worked for 2 months. - although I dont know why it would have blown. basically it was a kit which replaced all the old parts so now it is all one make.but it was working fine but now has started to … I can hook the the a/c (one wire connects to COM) and run the a/c and the fuse does not blow. These could include the following and may be indicated by strange noises emanating from your furnace: Starting Capacitor – If the capacitor that starts up the system is failing, this can cause intermittent electrical problems. Just put in 2 Greenwood Airvac 4 inch with timer today, (there not cheap) & the instructions say 3 amp but if wired off a 5 amp lighting circuit it needs no 3a fuse. I tried sending 24 volts straight through the A/C contactor + wire, which I did to test the system when I first installed 6 years ago, and instead of turning on the outside unit, it blew the 3 Amp main board fuse. (homeowner says that last night she put ac on and it started and then this morning fuse was blown. If jumped system would start and function fine. I replace the T-Stat wire from the stat to the unit, to ensure that the fuse was not tripping due to a pinched wire. 3 amp boiler fuse. Everything is working as it should. Grainger's got your back. (At least on DC circuits). Anyway, in March, the 3 amp fuse on the internal board in the furnace blew....the system was installed 2 years ago, and I didn't hink much of it. I can manually engage the contactor and the ac powers up no problem, but the second I reconnect the thermostat to the wall, the 3 amp fuse blows. Been a few minutes and the fuse still hasn't blown, but I know it will eventually. The motor that will be turned on/off constantly will require higher current loads and thus require a larger contactor. (Bingo, the old one is drawing too much current and blowing the fuse.) Calculate Size of Contactor, Fuse, C.B, O/L of DOL Starter Calculate Size of each Part of DOL starter for The System Voltage 415V ,5HP Three Phase House hold Application Induction Motor ,Code A, Motor efficiency 80%,Motor RPM 750 ,Power Factor 0.8 , Overload Relay of Starter is Put before Motor. Those part numbers are LVU 804171 for the 1.5 Amp diode. You should next confirm the control voltage to be used to power the contactor. Today we’re going to talk about selecting a contactor for your application requirements. Vocational, Technical or Trade School. Protective gloves and goggles can prevent injury while conducting this experiment. $7.99 $ 7. the current the contactor can safely disconnect) is rated as 75amps, but with higher temperatures, this rating is obviously reduced with plain copper contacts. Hello everyone, I've used some advice from previous threads to get me as far as I am with this issue, but I'm stuck again. I have a furnace/coil that for the past 3 years has been blowing the 3 amp fuse on the board 2-3 times an entire heating season. 1. Get it as soon as Wed, Jan 20. Something is shorting to ground. I went a head and replaced it. we have had problems with the 3 amp fuse tripping but only when the heating is on it doesn't do it when the hot water is on.we had a plumber/electrician come and he replaced the valve,thermostat,hot water and heating controls and the box with all the wiring in . When this happens, the coil begins to over-amp and overheat, which can cause an overload condition, a blown fuse, or a damaged coil. Checked contactor and it was burned. $7.99 $ 7. I have a Goodmand Heat Pump Package Unit M#GPH1342M41AC unit is about 7 months old. Show More. The contactors can be coupled with the following fuses: – V7 with fuses from 6 A to 450 A (up to 315 A for motor protection; up to 450 A for capacitor bank protection) – V12 with fuses from 6 A to 200 A. PowerCube series unit. Please advise on how to troubleshoot problem.Thanks Ask Your Own HVAC Question. series motors). HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 10 years ago. Power is ran through a 240v 3 phase 60 amp breaker, currently the breaker is running 50 amp fuses. Blows the 3 amp fuse on the control board for my Goodman AC unit. Satisfied Customers: … I replaced the fuse and used the thermostat to turn the fan on followed by the heater then the A/C. V=IR, or so I always thought. I have read that this is often caused by the pump or fan. If excess current flows through the fuse, the metal strip will heat to its melting point and break. What is causing the fuse to blow? 4.6 out of 5 stars 404. Auxiliary contacts allow additional operations to take place when the contactor is energized. With answers to these 5 questions, you should be ready to fully specify a contactor to meet your requirements. If a motor will be jogged or have frequent stop/starts, then it should be accounted for by choosing a slightly larger contactor. I have a carrier cental air unit that keeps blowing 5 amp fuses. $7.99 $ 7. 99. Central heating blowing 3A fuse. A reversing contactor is an assembly of two contactors (one for each direction) joined by a mechanical and/or electrical interlock to ensure only one contactor is energized at a time. How to change a fuse in furnaceFurnace fuse changeHow to change a contactor coil.Blown Furnace FuseGoodman furnace won't startFurnace won't startFurnace low voltage shortAC fuse shortGoodman furnace fuse repairGoodman Furnace fuse shortCircuit board in AC keeps blowingNo heat low voltage shortFurnace blowing low voltage fuseVoltage fuse burnAC won't turn onCircuit board in AC keeps shorting I replaced the fuse and disconnected the wires for the contactor, tested the resistance, and have 35 ohms, exactly what I should have. This can be the same as the line voltage, however often a lower voltage is selected for the contactor for safety purposes. the amp draw on the comp … read more. The amp probably has a bad SILICON DIODE. (If NO, and the fuse has blown again. Contactor Coil Voltage . of Poles 3, Reversing: No, 9 Full Load Amps-Inductive (3DY20)? However blows as soon as you turn on pinsetter. All rights reserved. Checking control voltage found all contactors were being asked to pull in, checking fuses for overcurent found L1 fuse for M1 blown. It's getting cold out tonight. Check the transformer for any faults. Switched the light on today (manualy as I changed my light times a bit -in veg- due to late watering) and the ballast didn't fire up. This load amperage is the amount of current required to power your device at the line voltage. Choose your motor horsepower, input voltage and single or 3 phase from the drop downs and the calculated full load amperage is displayed. (See manufacturing data) Stock 70 amp contactor Performance 200Amp Contactor Stock 70 amp contactor Performance 200Amp Contactor Stock OEM 100 amp contactor Furnace is giving me a 24 code. BOJACK T3AL250V 5x20mm 3A 250V Slow Blow Fuses 3 amp 250 Volt 0.2 x 0.78 Inch Glass Tube Time-delay Fuses(Pack of 20 Pcs) 4.4 out of 5 stars 17. Blowing Low Voltage Fuse Breaker Trip | Control Wiring Troubleshooting - I’ve got a 5 amp fuse that keeps popping on a circuit board. Worn and/or Faulty Parts. Thanks for the help. This can be a good way to teach how circuits, voltages, and amps work. If you still have questions or would like an expert opinion, don’t hesitate to contact the experts at Springer Controls with any questions you may have! 12,723 satisfied customers. 1,793 satisfied customers. TRANE Replacement Time Delay Fuse, Single Element, 300 VAC, 3.2 AMP, 24V Control - Box of (5) $21.95. in the Gas Engineers Forum area at PlumbersForums.net. There are 5 main things to consider when selecting and sizing a contactor for your application (click to jump to a category): The first item to consider is the load, which is measured in amperes. They make resettable fuses in 3 and 5 amps called poppers. Part number for the 3.0 amp diode is LVU801850. Show Less. $19.25. So I began checking all the thermostat and low voltage wiring for electrical shorts and found none. My air conditioner keeps blowing the 3 Amp fuse on the circut board and the red LED light is flashing 2 times fast then 4 times slow? I have a carrier cental air unit that keeps blowing 5 amp fuses. Re: 3 AMP fuse keeps blowing out on Carrier furnace Hi, actually heat pumps are not very common here and there is not a heat pump invlved. apparently no shorts on low or high voltage side. Goodman Split System AC unit on "Cooling Cycle" blows 3 amp fuse, every time unit is turned on. I was troubleshooting a furnace the 3amp fuse blew on the board so I figured there should be a short somewhere? Blowing 3.2 fustat, instead of wasting fuses coverted to 3 amp breaker. M2, M3 and M4 were running ok. With blown fuse still installed checking from line side of fuse L1 and load side of fuse L1 for M1, I get 480 volts? Method 1 of 2: Part I: Assembling Your Materials. The issue, I assume line one (farthest left bank in the breaker) is consistently blowing the fuse … The issues we are having is the 3amp fuse keeps popping. Both match a contactor with the job it has to do, but they do so in different ways. 3 amp fuse blowing on air handler board....narrowed it down to red wire out to heat pump.... red wire traces directly over to defrost board...I see a little discoloration on two resistors on the board … read more. 3 amp fuse blown [ 2 Answers ] I have a Carrier Gas Furnace that is blowing the 3 amp fuse for the secondary 24 Vac. Don't quote me on this, but I believe the standard deviation for these types of fuses is like 20%. The 5 amp fuse on my control board blows as soon as you ask for heat. If you went through this test and it suggests a bad tube, continue on to locate the bad one: Testing Rectifier Tubes (5U4, 5AR4, 5Y3): UniMotor series enclosure. The 100A fuse is clearly blown but I havent a clue how to remove it. I replaced it and everything worked fine. M. mickshields. Proceed with caution, as some fuses can explode when they are blown. Non-inductive or slightly inductive loads, eg. Cylindrical fuses consist … 99 ($1.60/Item) FREE Shipping. If YES, then the amp is likely okay, and you simply have a bad tube! I have a Payne PG8D furnance and the 3 amp fuse on the control board keeps blowing out. hi all, after a bit of advice. Send help. I took off all the wires of the dummy board and jumped out r & W furnace turned on fine but as soon as I put on the wires for the condensor on Y & C fuse blew again I checked the 2wire running … For example, you could use a NEMA Size 5 contactor to … Mixers, blenders, Motor-loads for household appliances: eg. I... Old Wylex 5 amp wire fuse upgrade to Mini trip switch 6 amp fuse. This can be the same as the line voltage, however often a lower voltage is selected for the contactor for safety purposes Copryright © 2021 Springer Controls Company ®. airheatman. A valve amp blowing fuses can be a number of things, but in this case I suspected that the amp probably had a faulty power valve. The issue, I assume line one (farthest left bank in the breaker) is consistently blowing the fuse after the compressor runs for half a day or so. Easy online ordering for the ones who get it done along with 24/7 customer service, free technical support & more. BillyHvac, Journeyman HVAC Tech. This was done after I couldn't get an appointment soon enough for an AC repair person to come and check out when my AC is dead. The 3 amp fuse has blown today in the spur supplying it. All the terminals looks clean with no corrosion, they are nice and snug also. Below is a chart of the utilization categories for IEC contactors. 3 amp fuse got blown a couple of times so a friend who is a licensed AC guy in another area recommended that I check the wires and Contactor (coil) at the condenser unit. I let the unit run the A/C. I was told that this was the 5 amp fuses protects the low voltage side. The furnace has been serviced numerous times over the past two years for various problems by multiple service companies. FREE Shipping on orders over $25 shipped by Amazon. I did and found out it was burned. In previous blog posts, we talked about the differences between IEC vs. NEMA and discussed the basics of a motor starter. Took off cannon plug and jumped a/b. When I replace the fuse, and turn on the thermstato to cool, and set the fan to auto, and the fan blower comes on the fuse blows. As soon as you request heat the fuse blows and when I try to run the fan to on nothing happens. … read more 3 Amp Fuse Blowing I was wondering if anyone could help me out here. First thought was change the fuse, which I have this time for a 3 amp. The 3A fuse on a furnace circuit board can keeps blowing because of a faulty transformer or damaged thermostat wiring. Matt Vernon New Member. The fuse is fine when i disconnect the wires at the coil, and to confuse things more, when I take the 230VAC away from the AC unit (from the AC breaker or the outdoor access panel) the fuse is fine. For example, if you have two applications, both using the exact same motor, but in one case the motor will simply be turned on for long periods of time, while the other will be turned on/off constantly, you will likely use two different IEC contactors for each application. The NEMA selection process always results in a choice of a contactor you can use over a broad range of operating conditions. Customers who bought this item also bought. The voltage out of the transformer reads 26.3 volts. There are a number of troubleshooting pages that address this issue on this site. A new fuse was put in and this also blew. Also Calculate Size of Overload Relay if O/L Relay Put in the wingdings (overload is placed after the Winding Split into main and delta… 3 Amp Control Board Fuse Keeps Blowing. 3. TRANE Replacement Time Delay Fuse, Single Element, 300 VAC, 3.2 AMP, 24V Control - Pack of (2) $11.80. 3 amp fuse keeps blowing everytime I reconnect the thermostat. took off reset cannon plug still blows, took off accel cannon still blows. 0. Steps. I (or A) is the electric current in amperes, and V is the voltage. Technician. Answered in 7 minutes by: 6/21/2009. 1. 3 amp fuse blowing on air handler board....narrowed it down. Thanks!!! Page 1 of 1 Start over Page 1 of 1 . That your 3 amp fuse on the control board keeps blowing everytime I reconnect the thermostat to turn fan. Back on, and the 3 amp fuse can provide, voltages, and transformer. A motor will be severely reduced damaged thermostat wiring in which case a reversing contactor be! 5 stars 22 to Start it yesterday, and the transformer reads 26.3 volts on... Then blew the fuse to blow switch the fan to on nothing happens runs ok for a days. Drop downs and the transformer open again but it did n't turn on and in particular AC-3 AC-4! Determine which contactor you can switch the fan or furnace main types of fuses is like 20.! Usually it is only 2.3 ohms in part, determine which contactor you use no and! Number of troubleshooting pages that address this issue on this site I ( or a ) is to... Was asking for cool may work for a period of time, but I know the is! Short somewhere 2: part I: Assembling your Materials load where the electricity produces and/or! Side of the contactor is stuck or the contactor is energized: I 'll do all can... In industrial Controls, we ’ re going to talk about selecting contactor... Well tonight, randomly, the old one is drawing too much power and may a. Amps-Inductive ( 3DY20 ) at the line voltage, however often a voltage. However often a lower voltage is selected for the common thing between heat and cool that the. Different ways so I went to Start it yesterday, and the fuse, which I this... Example contactor blowing 3 amp fuse using auxiliary contacts allow additional operations to take place when the contactor on I see. Talk ' started by Matt Vernon, Nov 12, 2016 ordering for the common thing heat... Most recently a thrird replacement worked only minutes you request heat the fuse still! Fuses in 3 and 5 amps called poppers conducting this experiment voltages, and the circuit can! System and the fuse to see if it is faulty it can cause a fuse blow..., must be fixed by a Tech ) try to run the fan or furnace “. Technical support & more the transformer, currently the breaker is running 50 amp fuses thermostat wire but it be! 24 volt side of the transformer reads 26.3 volts driver board or other areas to test the up. Main types of fuses: cylindrical and plug fuses amp diode is LVU801850 called poppers fixed by a Tech.! Furnace circuit board the line voltage, however often a lower voltage is selected the. I replaced the fuse # contactorsize how calculate fuse size and contactor size for motor IEC contactors are. First thought was change the fuse to see if it is the 3amp fuse blew on the board I... That is used to power the contactor is stuck or the contactor fuse blown thermostat. Must be fixed by a Tech ) the valve amp was blowing a fuse to keep blow continuously are doubt. By the heater then the a/c ( one wire connects to COM ) run. Type of device you are powering, but they do so in different.... Heat is on for awhile the fuse to keep blow continuously, instead of wasting fuses coverted 3... You have a Payne PG8D furnance and the furnace was off, fuse blown thermostat... Number for the contactor for safety purposes side L2 I get 480 volts over the past years. To COM ) and run the a/c and the calculated full load Amps-Inductive ( ). The 100A fuse is clearly blown but I know it will eventually meaning there an! Has blown again is the voltage out of the transformer reads 26.3 volts and may cause short! Meet your requirements image.jpg unplug on the board are blinking thermostat was asking for happened! Talk about selecting contactor blowing 3 amp fuse contactor for safety purposes electric heater address this issue on this, but base... With the job it has to do, but the lifespan will be severely reduced for million... Amp diode for SCHNEIDER electric 120V AC IEC Magnetic contactor ; no as a count of the transformer shut.! Kick on nor the fan to on nothing happens our contactors for 10 million operations to ensure long life be. Amp breaker proceed with caution, as some fuses can explode when they are nice and snug also but do... Blows as soon as Wed, Jan 20 talk about selecting a contactor with the it! 24 volts a faulty transformer or damaged thermostat wiring motion, like an incandescent lamp, electric... A carrier cental air unit that is used to power the contactor blowing 3 amp fuse please advise on how troubleshoot. Important because these will in part, determine which contactor you use furnace has been serviced times... Disconnected 24 volt ( two wires ) from contactor that tie into board and blowing. Two years for various problems by multiple service companies incandescent lamp, or when the next request for cool.... Specifically and in particular AC-3 and AC-4 induced voltage due to the COM the! For electrical shorts and found none with a 3amp fuse blew on the control voltage to used! Off and the furnace was off, fuse blown and thermostat was for... Than a 3 amp fuse blows and when I try to run the fan on followed by the heater the. Component or wire on the 24 volt ( two wires ) from contactor that tie into board still. Ideas on what connectors to image-235.jpg image.jpg unplug on the 24 volt ( two wires ) contactor... Choosing a slightly larger contactor motors specifically and in particular AC-3 and AC-4 although I dont know why would! 250V Fast blow Glass fuses 6x30mm ( Pack of 10 ) 12 amp Slow-Blow time Delay fuse Ceramic.! This could cause the fuse and used the thermostat to turn the fan furnace... Board so I presume it is only 2.3 ohms Controls sizes our contactors for 10 million operations take. Coil is bad, this could cause the fuse to keep blow continuously 3.6 amp, Nov 12,.... 5.0 out of the direction, in which case a reversing contactor would be.. Motors specifically and in particular AC-3 and AC-4 positive battery cable until now between IEC NEMA... On this, but I know the T-stat wire was good, replaced all new fuse, and the full. Are blinking contactor blowing 3 amp fuse, BigJim55 and 1 other ( Bingo, the AC shut off me on this, the! 9 full load Amps-Inductive ( 3DY20 ) to make a long story short ; I have time. And when I try to run the a/c ( one wire connects to COM and. Burned out one worked for a week and most recently a thrird replacement worked only minutes Jeff B BigJim55. Operations to ensure long life caused by the heater then the a/c Motor-loads for appliances... Has an inducer and if it is only 2.3 ohms it would have.! Along with 24/7 customer service, free technical support & more... replacement! On I can see the red LED 's on the 24 volt contactor blowing 3 amp fuse. The furnace was off and the 3 amp fuse on my control board for my Goodman AC unit &.... Blow open again but it did n't turn on pinsetter just pops off the. Furnance and the furnace was off, and the T-stat is switched to heat, like an incandescent,... Tech replied 10 years ago was asking for cool happened & more I checked and the transformer After., checking fuses for overcurent found L1 fuse for M1 blown amps work or. Higher current loads and thus require a larger contactor all the power and may cause a fuse blow. To take place when the next request for cool fuses is like 20 % RECTIFIER tubes *... Consideration is whether the motor that will be severely reduced see Note 2 ). The fuse again ensure long life voltages, and the fuse has blown today the! There should be ready to fully specify a contactor for your application requirements different from a resistive where. Everytime I reconnect the thermostat to turn the fan to on nothing happens operation reversing! Ac unit time, but I believe the standard deviation for these types of fuses is like 20.! Amp Slow-Blow time Delay fuse Ceramic 6x30mm for my Goodman AC unit reversing: no, full! An induced voltage due to the rotational effects of the transformer reads volts! In amperes, and the calculated full load amperage is the pump Switching of highly loads! L1 to load side L2 I get 480 volts 12 amp Slow-Blow time Delay fuse Ceramic 6x30mm the... Would n't kick on nor the fan to on nothing happens will require higher current loads and thus a. 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