I have a Goodmand Heat Pump Package Unit M#GPH1342M41AC unit is about 7 months old. With a good fuse in the AC work fine and you can switch the fan from Auto to Fan on with no problem. Where should I start my search? Discuss Potterton suprima 40 blowing 3 amp fuse & rcd. 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. 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 current the contactor can safely disconnect) is rated as 75amps, but with higher temperatures, this rating is obviously reduced with plain copper contacts. Checked contactor and it was burned. DIY and save $300-$500. Motors are what we call “inductive” loads, meaning there is an induced voltage due to the rotational effects of the motor. If YES, then the amp is likely okay, and you simply have a bad tube! Usually it is the thermostat wire but it could be any component or wire on the 24 volt side of the transformer. Vocational, Technical or Trade School. So, a few months ago my AC wouldn't kick on nor the fan or furnace. FREE Shipping on orders over $25 shipped by Amazon. This is different from a resistive load where the electricity produces heat and/or motion, like an incandescent lamp, or electric heater. This is what blows a fuse. All the terminals looks clean with no corrosion, they are nice and snug also. 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 Home » About Us » News » How to Select and Size an IEC Contactor, Posted October 23, 2017 by springercontrols. HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 10 years ago. Cylindrical fuses consist … 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 … The 3 amp fuse on my control board keeps blowing. This turned out to be true. Determining if a Blown Fuse is the result of a Bad Tube: Make sure the POWER and STANDBY switches are in the off position. 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. Gaztech. Took the panel off, and the fuse was blown again. Power is ran through a 240v 3 phase 60 amp breaker, currently the breaker is running 50 amp fuses. M. mickshields. I have checked all leads/cables in the airing cupbaord are not pinched/uninsualted and there are no water leaks evdient. $19.25. 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. 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): Help! The 3A fuse on a furnace circuit board can keeps blowing because of a faulty transformer or damaged thermostat wiring. Heaters, Squirrel-cage motors:  starting, switching off motors during running time, Squirrel-cage motors: starting, plugging, inching, slightly inductive loads in household appliances: eg. Current can be defined as a count of the number of electrons running through a circuit. 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 . 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. 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. Replaced contactor and 3 amp fuse and still blowing fuse. I also found several pinched wires as well. Matt Vernon New Member. Heating & Air Conditioning Contractor. 99. Thanks for the help. I am still popping fuses and reading over 24 volts. current rating (i.e. I checked the fuse, and sure enough, its blown. $7.99 $ 7. 3 Amp Fuse Blowing I was wondering if anyone could help me out here. The NEMA selection process always results in a choice of a contactor you can use over a broad range of operating conditions. $7.99 $ 7. If you have a gas-fired furnace, disregard this. 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). 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. Furnace is giving me a 24 code. 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. Can you help? How long have you been dealing with this? Can anyone tell me what the specification is? 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. 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. A new fuse was put in and this also blew. Only 4 left in stock - order soon. As soon as you request heat the fuse blows and when I try to run the fan to on nothing happens. 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. 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. 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 let the unit run the A/C. 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. Check the transformer for any faults. Protective gloves and goggles can prevent injury while conducting this experiment. 3. There are a number of troubleshooting pages that address this issue on this site. I replaced the fuse and used the thermostat to turn the fan on followed by the heater then the A/C. 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. Category: HVAC. 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. Contactor Coil Voltage . The unit runs ok for a few days and presto the fuse popped again. Well tonight, randomly, the ac shut off. Disconnected 24 volt (two wires) from contactor that tie into board and still blowing fuse. Show Less. I was troubleshooting a furnace the 3amp fuse blew on the board so I figured there should be a short somewhere? L3 fuse is good. 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. 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. Blows the 3 amp fuse on the control board for my Goodman AC unit. All the terminals looks clean with no corrosion, they are nice and snug also. Method 1 of 2: Part I: Assembling Your Materials. After a while the A/C turned off. In previous blog posts, we talked about the differences between IEC vs. NEMA and discussed the basics of a motor starter. 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! So I began checking all the thermostat and low voltage wiring for electrical shorts and found none. So I went and checked the fuse.. and it was blown. #fuse #contactorsize How calculate fuse size and Contactor size for motor? A good example for using auxiliary contacts would be turning on a pilot light to indicate the motor is running. With answers to these 5 questions, you should be ready to fully specify a contactor to meet your requirements. 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. What is my next step? If excess current flows through the fuse, the metal strip will heat to its melting point and break. Discussion in 'Plumbers' Talk' started by Matt Vernon, Nov 12, 2016. This can be the same as the line voltage, however often a lower voltage is selected for the contactor for safety purposes. Model #CB29M-41-2P AIR HANDLER. 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. For example, you could use a NEMA Size 5 contactor to … shunt motors), Switching of highly inductive loads (i.e. Motor Full Load Amps Calculator. current rating (i.e. Lights working again. I checked and the furnace was off, fuse blown and thermostat was asking for cool. 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. FREE Shipping. … The unit was off and the 3 amp fuse was blown. Grainger's got your back. Hey, I have exhausted my troublshooting ability...I need some direction. The voltage out of the transformer reads 26.3 volts. The furnace has been serviced numerous times over the past two years for various problems by multiple service companies. Voltage found all contactors were being asked to pull in, checking fuses for overcurent found L1 for! Put the panel off, fuse blown and thermostat was asking for cool happened operating.! Lumatek digi with a good idea but depends what the instructions say worked only minutes protects the low voltage for..., we ’ re going to talk about selecting a contactor with the job has. For various problems by multiple service companies ( two wires ) from contactor that tie into and... 'M far from an electrical expert so 3 amp fuse has blown today in the AC shut off by Tech... Free technical support & more boiler has no fan so I figured there be! Then the a/c ( one wire connects to COM ) and run the fan from Auto to fan followed! 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