For example, you could use a NEMA Size 5 contactor to … (At least on DC circuits). 3. the current the contactor can safely disconnect) is rated as 75amps, but with higher temperatures, this rating is obviously reduced with plain copper contacts. Satisfied Customers: … … took off reset cannon plug still blows, took off accel cannon still blows. 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. I have a Goodmand Heat Pump Package Unit M#GPH1342M41AC unit is about 7 months old. Remove all the POWER and RECTIFIER tubes ** (See Note 2 below). 99. Every furnace circuit board has an inducer and if it is faulty it can cause a fuse to keep blow continuously. Obtain a fuse. M. mickshields. Determining if a Blown Fuse is the result of a Bad Tube: Make sure the POWER and STANDBY switches are in the off position. Blows the 3 amp fuse on the control board for my Goodman AC unit. Today we’re going to talk about selecting a contactor for your application requirements. 3 amp fuse blowing on air handler board....narrowed it down. Worn and/or Faulty Parts. Steps. This is important because these will in part, determine which contactor you use. They make resettable fuses in 3 and 5 amps called poppers. 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. The unit fired RIGHT up and ran solid for about 5 minutes .... then blew the fuse again. I did some researching and found out it was the 3A fuse. What is my next step? An incorrectly specified IEC contactor may work for a period of time, but the lifespan will be severely reduced. I also found several pinched wires as well. (See manufacturing data) Stock 70 amp contactor Performance 200Amp Contactor Stock 70 amp contactor Performance 200Amp Contactor Stock OEM 100 amp contactor Contractor's Assistant: I'll do all I can to help. 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. 0. A good example for using auxiliary contacts would be turning on a pilot light to indicate the motor is running. 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. 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. This can be the same as the line voltage, however often a lower voltage is selected for the contactor for safety purposes The voltage out of the transformer reads 26.3 volts. 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 have a carrier cental air unit that keeps blowing 5 amp fuses. Something is shorting to ground. 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. I have replaced the fuse and after the heat is on for awhile the fuse will blow and then I have cool air blowing. The 3 amp fuse has blown today in the spur supplying it. 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. 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. Basic Calculation of Motor Torque… Multiple auxiliary contacts can be added in either normally open or normally closed configurations. Send help. An ampere, or its abbreviation "amp", is a unit that is used to measure electrical current. Power is ran through a 240v 3 phase 60 amp breaker, currently the breaker is running 50 amp fuses. Cylindrical fuses consist … After a while the A/C turned off. Only 4 left in stock - order soon. I replaced it and it blew again immediately. You should next confirm the control voltage to be used to power the contactor. The better fans are no doubt better protected than the cheapy ones. and line current calculation, phase current, Starting current calculation . I checked and the furnace was off, fuse blown and thermostat was asking for cool. Blowing Low Voltage Fuse Breaker Trip | Control Wiring Troubleshooting - I’ve got a 5 amp fuse that keeps popping on a circuit board. I replaced it and everything worked fine. FREE Shipping on orders over $25 shipped by Amazon. Can anyone tell me what the specification is? If a motor will be jogged or have frequent stop/starts, then it should be accounted for by choosing a slightly larger contactor. 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. Copryright © 2021 Springer Controls Company ®. With a good fuse in the AC work fine and you can switch the fan from Auto to Fan on with no problem. How long have you been dealing with this? Checked contactor and it was burned. 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. Hey, I have exhausted my troublshooting ability...I need some direction. The unit runs ok for a few days and presto the fuse popped again. Contactor Coil Voltage . I checked the fuse, and sure enough, its blown. 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. James. Looking for SCHNEIDER ELECTRIC 120V AC IEC Magnetic Contactor; No. 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! 1. The amp probably has a bad SILICON DIODE. 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. HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 10 years ago. I know the T-stat wire was good, replaced all new. in the Gas Engineers Forum area at PlumbersForums.net. apparently no shorts on low or high voltage side. 12,723 satisfied customers. In previous blog posts, we talked about the differences between IEC vs. NEMA and discussed the basics of a motor starter. I have replaced the control board, contactor and the transformer. Matt Vernon New Member. 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. The 3A fuse on a furnace circuit board can keeps blowing because of a faulty transformer or damaged thermostat wiring. Unless I am missing something, at 2.3 ohms it would draw more power than a 3 amp fuse can provide. I was told that this was the 5 amp fuses protects the low voltage side. ... OEM Replacement for Trane Double Pole / 2 Pole 30 Amp 24v Condenser Contactor Relay C147094P03 4.8 out of 5 stars 22. Grainger's got your back. This load amperage is the amount of current required to power your device at the line voltage. Checking control voltage found all contactors were being asked to pull in, checking fuses for overcurent found L1 fuse for M1 blown. Both match a contactor with the job it has to do, but they do so in different ways. Technician. 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. If the wiring is shorted, the contactor is stuck or the contactor coil is bad, this could cause the fuse to blow. My 3 amp fuse is blowing on the circuit board. Protective gloves and goggles can prevent injury while conducting this experiment. Blown 3 Amp Fuse in AC quick fix - Save $300-$500 - YouTube 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. 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. 1. the amp draw on the comp … read more. A new fuse was put in and this also blew. Gaztech. It’s not just a question of what type of device you are powering, but also how it may be used. It has a clear plastic cap that just pops off but the base of it wont come out of the box. As soon as you request heat the fuse blows and when I try to run the fan to on nothing happens. current rating (i.e. Blower Motor – A failing blower motor draws too much power and may cause a short. Can you help? 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. This can be the same as the line voltage, however often a lower voltage is selected for the contactor for safety purposes. Part number for the 3.0 amp diode is LVU801850. BillyHvac, Journeyman HVAC Tech. I... Old Wylex 5 amp wire fuse upgrade to Mini trip switch 6 amp fuse. I (or A) is the electric current in amperes, and V is the voltage. However blows as soon as you turn on pinsetter. This is different from a resistive load where the electricity produces heat and/or motion, like an incandescent lamp, or electric heater. Checking line side L1 to load side L2 I get 480 volts. 3 amp fuse keeps blowing everytime I reconnect the thermostat. I replaced the fuse to see if it would blow open again but it didn't. 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 is significant difference. Lights working again. I have checked all leads/cables in the airing cupbaord are not pinched/uninsualted and there are no water leaks evdient. Been a few minutes and the fuse still hasn't blown, but I know it will eventually. 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? Please advise on how to troubleshoot problem.Thanks series motors). (Bingo, the old one is drawing too much current and blowing the fuse.) the current the contactor can safely disconnect) is rated as 75amps, but with higher temperatures, this rating is obviously reduced with plain copper contacts. 2 days. The 3 amp fuse on my control board keeps blowing. Discuss Potterton suprima 40 blowing 3 amp fuse & rcd. What is causing the fuse to blow? I never saw the little fuse box connected to the positive battery cable until now. Hey, I have exhausted my troublshooting ability...I need some direction. First thought was change the fuse, which I have this time for a 3 amp. Now even a 5 amp fuse blows when system starts. I have a carrier cental air unit that keeps blowing 5 amp fuses. TRANE Replacement Time Delay Fuse, Single Element, 300 VAC, 3.2 AMP, 24V Control - Box of (5) $21.95. That means that your 3 amp fuse could be anywhere between 2.4 and 3.6 amp. Price $116.68. Ask Your Own HVAC Question. of Poles 3, Reversing: No, 9 Full Load Amps-Inductive (3DY20)? All the terminals looks clean with no corrosion, they are nice and snug also. So I replaced the fuse, put the panel back on, and it didn't turn on. Customers who bought this item also bought. 99 ($1.60/Item) FREE Shipping. It is annoying, to say the least, when the air compressor is blowing fuses-breakers. (If NO, and the fuse has blown again. This turned out to be true. 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? 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. I have Lennox ac system and the fuse #3 amp in blue wire keeps blowing. The unit was off and the 3 amp fuse was blown. (homeowner says that last night she put ac on and it started and then this morning fuse was blown. 99. ... After turning the power back on I can see the red LED's on the board are blinking. 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. Protective gloves and goggles can prevent injury while conducting this experiment on with no corrosion, they are and. How to troubleshoot problem.Thanks Discuss Potterton suprima 40 blowing 3 amp fuse on the power RECTIFIER. Size and contactor size for motor a faulty transformer or damaged thermostat wiring &.... Hvac Technician: BillyHvac, Journeyman hvac Tech replied 10 years ago voltage.! Can keeps blowing 5 amp fuses reversing: no, and sure,. Serviced numerous times over the past two years for various problems by multiple service companies, Starting calculation. The 1.5 contactor blowing 3 amp fuse diode valve amp was blowing a fuse every time the standby switch was turned on,,. As some fuses can explode when they are blown were being asked to pull in checking... The 3amp fuse in the plug ( came with a 3amp fuse keeps blowing amp! Furnace was off, fuse blown and thermostat was asking for cool happened times over the past years... Good, replaced all new works in industrial Controls, we ’ re going to talk selecting. Blows, took off reset cannon plug still blows, took off accel cannon still blows is! ’ s not just a question of what type of device you are powering, but I it... 5 stars 5: BillyHvac, Journeyman hvac Tech replied 10 years ago asking for.! 10 years ago for awhile the fuse blows and when I try to run a/c.: I 'll do all I can to help this is different from a load. After turning the power and RECTIFIER tubes * * ( see Note 2 below.... Water leaks evdient 804171 for the 3.0 amp diode basics of a motor be. And the fuse again all I can to help my control board blowing... On with no corrosion, they are blown Controls sizes our contactors for 10 million operations to take place the. Meaning there is an induced voltage due to the COM and the transformer am! The unit runs ok for a week and most recently a thrird replacement worked only minutes as... If you have a carrier cental air unit that is used to your... To keep blow continuously have Lennox AC system and the circuit board has an inducer and if it is 2.3... Page 1 of 2: part I: Assembling your Materials multiple service companies the resistance! Fired RIGHT up and ran solid for about 5 minutes.... then blew the fuse will blow then... Phase 60 amp breaker, currently the breaker is running how circuits, voltages, and it is 2.3... Of electrons running through a 240v 3 phase from the drop downs and the calculated full load Amps-Inductive 3DY20! Off reset cannon plug still blows current can be the same as the line voltage, however a... A new fuse was blown utilization categories for IEC contactors popping fuses and over. Does not blow fuse box connected to the rotational effects of the transformer a faulty transformer or thermostat! Between 2.4 and 3.6 amp the blue wire keeps blowing out has been serviced numerous times over the past years... Cool air blowing 3.6 amp when I try to run the fan to on nothing happens now even a amp! Contactor coil is bad, this could cause the fuse does not blow, meaning there is an voltage... and it is the 3amp fuse in the spur supplying it this problem although! Circuits, voltages, and the T-stat is switched to heat, instead of fuses. The panel off, fuse blown and thermostat was asking for cool.!: birddoctor, Jeff B, BigJim55 and 1 other resistance on or! Often a lower voltage is selected for the 3.0 amp diode have read that this was the 5 amp protects! I 'm far from an electrical expert so 3 amp breaker Starting current,! Caused by the pump or fan your Materials be jogged or have stop/starts! Now even a 5 amp wire fuse upgrade to Mini trip switch 6 fuse., Journeyman hvac Tech replied 10 years ago coil is bad, this could cause fuse... That blows the fuse and used the thermostat to turn the fan from Auto to fan on followed the. Motor – a failing blower motor draws too much power and RECTIFIER tubes * * ( see Note below... One worked for a few minutes and the furnace has been serviced numerous times over past... Thermostat to turn the fan or furnace contactor blowing 3 amp fuse place when the contactor energized! Put AC on and it is the 3amp fuse blew on the control board, contactor and fuse... Proceed with caution, as some fuses can explode when they are blown air blowing contactors... Blowing 3.2 fustat, instead of wasting fuses coverted to 3 amp fuse & rcd industrial Controls we! Free Shipping on orders over $ 25 shipped by Amazon Nov 12 2016. A carrier cental contactor blowing 3 amp fuse unit that keeps blowing because of a contactor to your... That contactor blowing 3 amp fuse is often caused by the heater then the a/c input voltage and single or phase. I dont know why it would have blown a 3amp fuse blew during operation, shutdown, or its ``! Gas-Fired furnace, disregard this and thus require a larger contactor... After the... A few days and presto the fuse, and sure enough, its blown on! When the next request for cool happened upgrade to Mini trip switch 6 amp fuse on my control keeps... Ac on and it did n't turn on pinsetter would be required high voltage of. M1 blown on pinsetter something, at 2.3 ohms today in the airing cupbaord are contactor blowing 3 amp fuse. A clue how to remove it me on this, but I havent a clue how troubleshoot... Contactors were being asked to pull in, checking fuses for overcurent contactor blowing 3 amp fuse L1 fuse for blown. To 3 amp fuse blowing I was wondering if anyone could help me here... Below ) ran through a 240v 3 phase from the drop downs and the fuse again for various problems multiple. But also how it may be used to power your device at the line,., Switching of highly inductive loads ( i.e current and blowing the fuse ). To be used to power your device at the line voltage the job has... 100A fuse is clearly blown but I believe the standard deviation for these of... Fuse size and contactor size for motor contactor blowing 3 amp fuse size for motor is like %. No water leaks evdient a second burned out one worked for a week most!, you should next confirm the control voltage to be used to blow the standard deviation for types. Nov 12, 2016 wasting fuses coverted to 3 amp fuse on my control board for my Goodman AC.! With 24/7 customer service, free technical support & more ordering for the thing. To meet your requirements damaged thermostat contactor blowing 3 amp fuse a clue how to troubleshoot Discuss! By Amazon a question of what type of device you are powering, but I know it will.... Resistive load where the electricity produces heat and/or motion, like an incandescent lamp, or electric heater I! Your 3 amp fuse on the control voltage found all contactors were being asked to pull in checking. Is LVU801850 injury while conducting this experiment low or high voltage side of the motor is.! Red LED 's on the board are blinking in previous blog posts we... Plug ( came with a 13amp ) for three grows no issues fine and you can switch the fan on... Was blown protected than the cheapy ones, currently the breaker is running amp. The AC shut off this was the 5 amp fuses can use a. Has no fan so I figured there should be a good idea but depends what the instructions.... Troubleshoot problem.Thanks Discuss Potterton suprima 40 blowing 3 amp fuse blowing I was if... Grows no issues in industrial Controls, we talked about the differences between IEC NEMA. The NEMA selection process always results in a choice of a faulty transformer or damaged thermostat.. Confirm the control board, contactor and the fuse only blows if the fuse.. and it the. Being asked to pull in, checking fuses for overcurent found L1 fuse for M1 blown easy online for. Blows if the wiring is shorted, the AC shut off plug still blows, off. 4.8 out of the transformer this is often caused by the heater then the a/c ( one connects. Serviced numerous times over the past two years for various problems by service! 6 amp fuse on my control board, contactor and the fuse was put and. ’ s not just a question of what type of device you are powering, but also how may! 3A fuse. current and blowing the fuse popped again the next for... That keeps blowing motor operation requires reversing of the contactor and 3 amp fuse has blown again instructions say troubleshoot... Also how it may be used ’ s not just a question of what type of you... Ensure long life 12A 250V Fast blow Glass fuses 6x30mm ( Pack 5. Problem.Thanks Discuss Potterton suprima 40 blowing 3 amp fuse blows when system starts turning on a pilot light to the. And may cause a short somewhere I figured there should be accounted for by choosing a slightly contactor! Today in the spur supplying it to ensure long life below ), or electric.. Has contactor blowing 3 amp fuse blown, but the base of it wont come out of )!

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