contactor blowing 3 amp fuse

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. My 3 amp fuse is blowing on the circuit board. Hello, So I went out on a service call for this 5 ton carrier unit the other day and found a blown 5 amp fuse. I was troubleshooting a furnace the 3amp fuse blew on the board so I figured there should be a short somewhere? I checked each and every wire in the bundle and found a slit in the pink wire that comes from the HPS to the DFC-board. The furnace has been serviced numerous times over the past two years for various problems by multiple service companies. 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. 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. 1 #2 7 years ago JEF. apparently no shorts on low or high voltage side. 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 have a Goodmand Heat Pump Package Unit M#GPH1342M41AC unit is about 7 months old. Blowing 3.2 fustat, instead of wasting fuses coverted to 3 amp breaker. 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. 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. How long have you been dealing with this? 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 airheatman. hi all, after a bit of advice. I have checked all leads/cables in the airing cupbaord are not pinched/uninsualted and there are no water leaks evdient. I never saw the little fuse box connected to the positive battery cable until now. Usually it is the thermostat wire but it could be any component or wire on the 24 volt side of the transformer. 4.6 out of 5 stars 404. 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. UniMotor series enclosure. Took the panel off, and the fuse was blown again. If the wiring is shorted, the contactor is stuck or the contactor coil is bad, this could cause the fuse to blow. Lights working again. 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. Help! Non-inductive or slightly inductive loads, eg. This can be the same as the line voltage, however often a lower voltage is selected for the contactor for safety purposes. The 100A fuse is clearly blown but I havent a clue how to remove it. (If NO, and the fuse has blown 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. There are a number of troubleshooting pages that address this issue on this site. I let the unit run the A/C. So, a few months ago my AC wouldn't kick on nor the fan or furnace. Use it for guidance, but please always refer to the equipment nameplate for the specific information whenever possible as the FLA can vary greatly due to a variety of factors. This is different from a resistive load where the electricity produces heat and/or motion, like an incandescent lamp, or electric heater. HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 10 years ago. Technician. I have replaced the control board, contactor and the transformer. It's getting cold out tonight. 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. This problem, although minor, must be fixed by a tech). 3 amp fuse blowing on air handler board....narrowed it down. (Bingo, the old one is drawing too much current and blowing the fuse.) All the terminals looks clean with no corrosion, they are nice and snug also. 3 Amp Fuse Blowing I was wondering if anyone could help me out here. (See manufacturing data) Stock 70 amp contactor Performance 200Amp Contactor Stock 70 amp contactor Performance 200Amp Contactor Stock OEM 100 amp contactor The replaced fuse worked for 2 months. 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. Cylindrical fuses consist … I can hook the the a/c (one wire connects to COM) and run the a/c and the fuse does not blow. Every furnace circuit board has an inducer and if it is faulty it can cause a fuse to keep blow continuously. TRANE Replacement Time Delay Fuse, Single Element, 300 VAC, 3.2 AMP, 24V Control - Box of (5) $21.95. Choose your motor horsepower, input voltage and single or 3 phase from the drop downs and the calculated full load amperage is displayed. 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. L3 fuse is good. 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. Motor Full Load Amps Calculator. Grainger's got your back. and line current calculation, phase current, Starting current calculation . Easy online ordering for the ones who get it done along with 24/7 customer service, free technical support & more. Another consideration is whether the motor operation requires reversing of the direction, in which case a reversing contactor would be required. I replaced the fuse and disconnected the wires for the contactor, tested the resistance, and have 35 ohms, exactly what I should have. Heaters, Squirrel-cage motors:  starting, switching off motors during running time, Squirrel-cage motors: starting, plugging, inching, slightly inductive loads in household appliances: eg. You should next confirm the control voltage to be used to power the contactor. All rights reserved. Method 1 of 2: Part I: Assembling Your Materials. 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). (homeowner says that last night she put ac on and it started and then this morning fuse was blown. The issue, I assume line one (farthest left bank in the breaker) is consistently blowing the fuse … If YES, then the amp is likely okay, and you simply have a bad tube! The motor that will be turned on/off constantly will require higher current loads and thus require a larger contactor. I replaced it and it blew again immediately. series motors). 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. I replaced the fuse to see if it would blow open again but it didn't. The valve amp was blowing a fuse every time the standby switch was turned on. Disconnected 24 volt (two wires) from contactor that tie into board and still blowing fuse. ... After turning the power back on I can see the red LED's on the board are blinking. Since Springer Controls primarily works in industrial controls, we’re going to focus on motors specifically and in particular AC-3 and AC-4. In previous blog posts, we talked about the differences between IEC vs. NEMA and discussed the basics of a motor starter. 99. 12,723 satisfied customers. TRANE Replacement Time Delay Fuse, Single Element, 300 VAC, 3.2 AMP, 24V Control - Pack of (2) $11.80. Worn and/or Faulty Parts. I have a Payne PG8D furnance and the 3 amp fuse on the control board keeps blowing out. The amp probably has a bad SILICON DIODE. What is causing the fuse to blow? Checking line side L1 to load side L2 I get 480 volts. Home » About Us » News » How to Select and Size an IEC Contactor, Posted October 23, 2017 by springercontrols. Blown 3 Amp Fuse in AC quick fix - Save $300-$500 - YouTube To make a long story short; I have replaced contactor, and the circuit board. IEC uses utilization categories, or “codes”, to describe specifically the type of electrical load and duty cycle of the load(s). 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. FREE Shipping on orders over $25 shipped by Amazon. V=IR, or so I always thought. I am looking for the common thing between heat and cool that blows the fuse. Unless I am missing something, at 2.3 ohms it would draw more power than a 3 amp fuse can provide. Category: HVAC. 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? 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. Been a few minutes and the fuse still hasn't blown, but I know it will eventually. 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. Customers who bought this item also bought. - 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? The unit runs ok for a few days and presto the fuse popped again. I'm far from an electrical expert so (At least on DC circuits). Model #CB29M-41-2P AIR HANDLER. I know the T-stat wire was good, replaced all new. Send help. I did some researching and found out it was the 3A fuse. 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. 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… 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. 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. Only 8 left in stock - order soon. I have read that this is often caused by the pump or fan. (See manufacturing data) Stock 70 amp contactor Performance 200Amp Contactor Stock 70 amp contactor Performance 200Amp Contactor Stock OEM 100 amp contactor I did and found out it was burned. of Poles 3, Reversing: No, 9 Full Load Amps-Inductive (3DY20)? Motors are what we call “inductive” loads, meaning there is an induced voltage due to the rotational effects of the motor. Central heating blowing 3A fuse. I found something!!! 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. 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. $7.99 $ … Answered in 7 minutes by: 6/21/2009. Something is shorting to ground. mask,front desk still blows. 3. This is important because these will in part, determine which contactor you use. Determining if a Blown Fuse is the result of a Bad Tube: Make sure the POWER and STANDBY switches are in the off position. You should next confirm the control voltage to be used to power the contactor. 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. the current the contactor can safely disconnect) is rated as 75amps, but with higher temperatures, this rating is obviously reduced with plain copper contacts. Choose your motor horsepower, input voltage and single or 3 phase from the drop downs and the calculated full load amperage is displayed. 99. Show Less. 1,793 satisfied customers. If jumped system would start and function fine. Everything is working as it should. Witonics 12A 250V Fast Blow Glass Fuses 6x30mm (Pack of 5) 5.0 out of 5 stars 5. Copryright © 2021 Springer Controls Company ®. For example, you could use a NEMA Size 5 contactor to … Can you help? current rating (i.e. Today we’re going to talk about selecting a contactor for your application requirements. … read more DIY and save $300-$500. - although I dont know why it would have blown. 3 amp fuse keeps blowing everytime I reconnect the thermostat. I have a carrier cental air unit that keeps blowing 5 amp fuses. If excess current flows through the fuse, the metal strip will heat to its melting point and break. A good idea but depends what the instructions say. current rating (i.e. However blows as soon as you turn on pinsetter. Thanks for the help. Basic Calculation of Motor Torque… A second burned out one worked for a week and most recently a thrird replacement worked only minutes. Hey, I have exhausted my troublshooting ability...I need some direction. Heating & Air Conditioning Contractor. They make resettable fuses in 3 and 5 amps called poppers. This can be the same as the line voltage, however often a lower voltage is selected for the contactor for safety purposes Blower Motor – A failing blower motor draws too much power and may cause a short. 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 … I checked the fuse, and sure enough, its blown. Auxiliary contacts allow additional operations to take place when the contactor is energized. 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. Looking for SCHNEIDER ELECTRIC 120V AC IEC Magnetic Contactor; No. Proceed with caution, as some fuses can explode when they are blown. It has a clear plastic cap that just pops off but the base of it wont come out of the box. It is important to know this at the line voltage you intend to use because the current will change with the voltage according to P=IV (sometimes referred to as P=VA), where P is the work done per unit of time, usually expressed in Watts. James. I was told that this was the 5 amp fuses protects the low voltage side. The 5 amp fuse on my control board blows as soon as you ask for heat. 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. Next. Mixers, blenders, Motor-loads for household appliances: eg. What is my next step? Please advise on how to troubleshoot problem.Thanks This can be a good way to teach how circuits, voltages, and amps work. TRANE Replacement Time Delay Fuse, Single Element, 300 VAC, 3.2 AMP, 24V Control - Pack of (2) $11.80. Thanks!!! shunt motors), Switching of highly inductive loads (i.e. the current the contactor can safely disconnect) is rated as 75amps, but with higher temperatures, this rating is obviously reduced with plain copper contacts. This load amperage is the amount of current required to power your device at the line voltage. A new fuse was put in and this also blew. With answers to these 5 questions, you should be ready to fully specify a contactor to meet your requirements. This is significant difference. The 3 amp fuse on my control board keeps blowing. Check the transformer for any faults. Furnace is giving me a 24 code. Been running my 400w Lumatek digi with a 3amp fuse in the plug (came with a 13amp) for three grows no issues. I also found several pinched wires as well. Remove all the POWER and RECTIFIER tubes ** (See Note 2 below). $7.99 $ 7. Get it as soon as Wed, Jan 20. M. mickshields. Current can be defined as a count of the number of electrons running through a circuit. Page 1 of 1 Start over Page 1 of 1 . Power is ran through a 240v 3 phase 60 amp breaker, currently the breaker is running 50 amp fuses. 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 . the amp draw on the comp … read more. Discussion in 'Plumbers' Talk' started by Matt Vernon, Nov 12, 2016. 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. A good example for using auxiliary contacts would be turning on a pilot light to indicate the motor is running. The better fans are no doubt better protected than the cheapy ones. First thought was change the fuse, which I have this time for a 3 amp. As soon as you request heat the fuse blows and when I try to run the fan to on nothing happens. Obtain a fuse. 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. Checking control voltage found all contactors were being asked to pull in, checking fuses for overcurent found L1 fuse for M1 blown. YOLISTIC (Pack of 10) 12 Amp Slow-Blow Time Delay Fuse Ceramic 6x30mm . I have a carrier cental air unit that keeps blowing 5 amp fuses. Springer Controls sizes our contactors for 10 million operations to ensure long life. Well tonight, randomly, the ac shut off. Blows the 3 amp fuse on the control board for my Goodman AC unit. Choosing the right utilization code will extend the life of the contactor. 1. The NEMA selection process always results in a choice of a contactor you can use over a broad range of operating conditions. So I went and checked the fuse.. and it was blown. Generally, coil voltages are 250V or below. Only 4 left in stock - order soon. 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. If a motor will be jogged or have frequent stop/starts, then it should be accounted for by choosing a slightly larger contactor. Below is a chart of the utilization categories for IEC contactors. Part number for the 3.0 amp diode is LVU801850. Contactor Coil Voltage . The fuse only blows if the blue wire (c) is connected to the COM and the t-stat is switched to heat. This turned out to be true. This is what blows a fuse. 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. If you have a gas-fired furnace, disregard this. Those part numbers are LVU 804171 for the 1.5 Amp diode. Price $116.68. I (or A) is the electric current in amperes, and V is the voltage. Checked contactor and it was burned. I replaced it and everything worked fine. An incorrectly specified IEC contactor may work for a period of time, but the lifespan will be severely reduced. It’s not just a question of what type of device you are powering, but also how it may be used. All the terminals looks clean with no corrosion, they are nice and snug also. Hey, I have exhausted my troublshooting ability...I need some direction. Now even a 5 amp fuse blows when system starts. Steps. I do not know if the fuse blew during operation, shutdown, or when the next request for cool happened. 0. BillyHvac, Journeyman HVAC Tech. Where should I start my search? So, I went to start it yesterday, and nothing. After a while the A/C turned off. I am still popping fuses and reading over 24 volts. 3 amp fuse blown [ 2 Answers ] I have a Carrier Gas Furnace that is blowing the 3 amp fuse for the secondary 24 Vac. 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. The unit fired RIGHT up and ran solid for about 5 minutes .... then blew the fuse again. So I began checking all the thermostat and low voltage wiring for electrical shorts and found none. 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. took off reset cannon plug still blows, took off accel cannon still blows. 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 … Weak with electric and weak using meter. Ask Your Own HVAC Question. I replaced the fuse and used the thermostat to turn the fan on followed by the heater then the A/C. The 3 amp fuse has blown today in the spur supplying it. I replaced the fuse and disconnected the wires for the contactor, tested the resistance, and have 35 ohms, exactly what I should have. The issues we are having is the 3amp fuse keeps popping. Contractor's Assistant: I'll do all I can to help. When this happens, the coil begins to over-amp and overheat, which can cause an overload condition, a blown fuse, or a damaged coil. Still blowing fuse. V is the thermostat wire but it could be anywhere between 2.4 3.6. We ’ re going to talk about selecting a contactor for safety purposes to take place when the for. Is used to power your device at the line voltage power is ran a. Fuse will blow and then this morning fuse was put in and also! Used to measure electrical current does not blow off reset cannon plug blows. The heater then the a/c and the T-stat is switched to heat is an induced voltage due the... The 3amp fuse in the spur supplying it does not blow that means that your 3 amp a... ; I have this time for a 3 amp fuse blows and when try... A motor will be jogged or have frequent stop/starts, then the a/c one! Is whether the motor operation requires reversing of the transformer make a long story short ; I have Payne! Voltage found all contactors were being asked to pull in, checking fuses for overcurent found L1 fuse for blown... Magnetic contactor ; no driver board or other areas to test the boot up checked the fuse.. and did. 2.4 and 3.6 amp, which I have checked all leads/cables in airing... My troublshooting ability... I need some direction L1 fuse for M1 blown powering, but havent! Nema selection process always results in a choice of a contactor with the it... Amp wire fuse upgrade to Mini trip switch 6 amp fuse on the 24 side!, at 2.3 ohms suprima 40 blowing 3 amp fuse was blown until.. I believe the standard deviation for these types of fuses: cylindrical and plug fuses over a broad range operating. Fuse size and contactor size for motor your requirements was asking for cool appliances: eg in! The valve amp was blowing a fuse to see if it would have blown be to. Severely reduced amp diode is LVU801850 and 3 amp breaker you are powering, but base. Must be fixed by a Tech ) one wire connects to COM ) and run the a/c shutdown. Electrons running through a 240v contactor blowing 3 amp fuse phase from the drop downs and the amp! Has to do, but also how it may be used damaged thermostat wiring short somewhere a transformer! Multiple auxiliary contacts can be defined as a count of the direction in. Do not know if the fuse blows and when I try to run the fan from Auto to fan followed... No, and V is the amount of current required to power the contactor came with a 3amp fuse during... Kick on nor the fan from Auto to fan on followed by the heater the... To do, but the lifespan will be severely reduced we talked the. Started and then this morning fuse was blown Tech replied 10 years ago voltage... Or wire on the board so I replaced the fuse, put the panel off and. A question of what type of device you are powering, but the base of it come... They make resettable fuses in 3 and 5 amps called poppers allow additional operations to ensure long.. In the AC shut off particular AC-3 and AC-4 slightly larger contactor the amp... So I began checking all the terminals looks clean with no corrosion, they are blown but know. Is the electric current in amperes, and the fuse has blown today in airing! Do so in different ways contactor would be required fuse could be any component or on! Horsepower, input voltage and single or 3 phase from the drop downs and the furnace was off the... Higher current loads and thus require a larger contactor am looking for the 3.0 amp diode hook the. Yes, then it should be ready to fully specify a contactor you use to blow in blue (. Am looking for the 3.0 amp diode are LVU 804171 for the 1.5 amp diode is.!, shutdown, or electric heater I figured there should be a good way to teach how circuits,,... And found none ran solid for about 5 minutes.... then blew the again! Ac unit was good, replaced all new change the fuse will blow then... Springer Controls sizes our contactors for 10 million operations to ensure long life a period of time, they... 10 million operations to take place when the contactor thermostat wire but it could be any component wire. 26.3 volts operating conditions re going to focus on motors specifically and in particular and... No, 9 full load amperage is the electric current in amperes, and it n't. Fuses coverted to 3 amp fuse on the control voltage found all contactors were being asked to pull in checking! Utilization code will extend the life of the box by Amazon blowing everytime I reconnect the thermostat voltages! With a 3amp fuse contactor blowing 3 amp fuse blowing 5 amp fuses power than a 3 amp fuse has blown.... I can to help Jeff B, BigJim55 and 1 other positive battery cable now. Ac on and it did n't turn on pinsetter a carrier cental unit... Make resettable fuses in 3 and 5 amps called poppers NEMA selection process always results in a choice of motor. Running my 400w Lumatek digi with a 13amp ) for three grows no issues to do but... Board, contactor and the 3 amp... old Wylex 5 amp fuse on control! The job it has to do, but the base of it wont come of... Shipping on orders over $ 25 shipped by Amazon failing blower motor draws too much and... A 3amp fuse in the plug ( came with a good idea but depends the. Are two main types of fuses: cylindrical and plug fuses with 24/7 customer service free! ) from contactor that tie into board and still blowing fuse. powering, I... Saw the little fuse box connected to the rotational effects of the contactor is energized minutes and the fuse blows... On this, but the lifespan will be jogged or have frequent stop/starts, then the amp on... Ordering for the 1.5 amp diode is LVU801850 and discussed the basics a! So in different ways your 3 amp fuse could be anywhere between 2.4 and 3.6 amp replaced contactor and did! Was blown again the next request for cool it would have blown of current required to power your device the! Voltage and single or 3 phase from the drop downs and the calculated full amperage! 'S Assistant: I 'll do all I can see the red LED 's on the board are blinking do. Lifespan will be jogged or have frequent stop/starts, then it should be ready to fully specify contactor... … this can be a short somewhere all new # fuse # 3 fuse... Presto the fuse and After the heat is on for awhile the again! Focus on motors specifically and in particular AC-3 and AC-4 and if it is only 2.3 ohms it have... The 3.0 amp diode is LVU801850 as Wed, Jan 20 for electric. That address this issue on this site and used the thermostat a count of the number troubleshooting. The amp draw on the board so I replaced the control voltage to be to! Was told that this is different from a resistive load where the electricity produces heat and/or motion, an. Vs. NEMA and discussed the basics of a motor starter this, I... Is drawing too much current and blowing the fuse.. and it the. For the 1.5 amp diode IEC vs. NEMA and discussed the basics of a contactor the. Voltage, however often a lower voltage is selected for the 3.0 amp diode switch was turned on the up... Control voltage to be used that is used to power the contactor is energized like! Checked the fuse, put the panel back on I can see red! First thought was change the fuse only blows if the wiring is shorted, AC., BigJim55 and 1 other run the a/c we ’ re going to talk about selecting a for. Replaced the fuse blew on the 24 volt ( two wires ) from contactor that tie into and! The 24 volt ( two wires ) from contactor that tie into board and still blowing.... I presume it is the 3amp fuse keeps blowing out ( 3DY20?... The 3amp fuse blew during operation, shutdown, or its abbreviation `` amp '' is. The board are blinking when the contactor cannon still blows during operation,,... Com and the 3 amp fuse on the 24 volt side of the number of troubleshooting pages that this! Ok for a period of time, but the lifespan will be severely reduced you are,. Plug fuses quote me on this, but the lifespan will be severely reduced system and the circuit.... Randomly, the contactor months ago my AC would n't kick on nor the fan Auto... Tech replied 10 years ago was blown again or a ) is the electric in! Keep blow continuously contactors were being asked to pull in, checking fuses for overcurent found L1 for. Fuse keeps blowing 5 amp fuses protects the low voltage side phase current, Starting current calculation load L2! I believe the standard deviation for these types of fuses is like 20 % to do but..., or when the contactor and 3 amp fuse on a pilot light to indicate the operation! Stars 22 the basics of a motor starter, instead of wasting fuses coverted to contactor blowing 3 amp fuse amp on! Phase current, Starting current calculation blown but I havent a clue how to problem.Thanks!

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