; Inspect the tube sockets - make sure there are NO burn marks (any burn marks must be removed before the amp … L3 fuse is good. HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 10 years ago. The furnace has been serviced numerous times over the past two years for various problems by multiple service companies. V=IR, or so I always thought. Next. I have a Goodmand Heat Pump Package Unit M#GPH1342M41AC unit is about 7 months old. Worn and/or Faulty Parts. Help! However blows as soon as you turn on pinsetter. There are a number of troubleshooting pages that address this issue on this site. This is what blows a fuse. 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? Choose your motor horsepower, input voltage and single or 3 phase from the drop downs and the calculated full load amperage is displayed. mask,front desk still blows. 1. Auxiliary contacts allow additional operations to take place when the contactor is energized. M. mickshields. I checked the fuse, and sure enough, its blown. 3 amp fuse blown [ 2 Answers ] I have a Carrier Gas Furnace that is blowing the 3 amp fuse for the secondary 24 Vac. Replaced contactor and 3 amp fuse and still blowing fuse. Been running my 400w Lumatek digi with a 3amp fuse in the plug (came with a 13amp) for three grows no issues. The NEMA selection process always results in a choice of a contactor you can use over a broad range of operating conditions. (homeowner says that last night she put ac on and it started and then this morning fuse was blown. Been a few minutes and the fuse still hasn't blown, but I know it will eventually. Category: HVAC. 3 Amp Control Board Fuse Keeps Blowing. of Poles 3, Reversing: No, 9 Full Load Amps-Inductive (3DY20)? A good example for using auxiliary contacts would be turning on a pilot light to indicate the motor is running. Blowing 3.2 fustat, instead of wasting fuses coverted to 3 amp breaker. This load amperage is the amount of current required to power your device at the line voltage. 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. Goodman Split System AC unit on "Cooling Cycle" blows 3 amp fuse, every time unit is turned on. Contractor's Assistant: I'll do all I can to help. Those part numbers are LVU 804171 for the 1.5 Amp diode. 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… A good idea but depends what the instructions say. 0. Part number for the 3.0 amp diode is LVU801850. 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. Steps. Below is a chart of the utilization categories for IEC contactors. If jumped system would start and function fine. 1. Mixers, blenders, Motor-loads for household appliances: eg. 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. 6 years college. Multiple auxiliary contacts can be added in either normally open or normally closed configurations. Unless I am missing something, at 2.3 ohms it would draw more power than a 3 amp fuse can provide. I am looking for the common thing between heat and cool that blows the fuse. The 3 amp fuse has blown today in the spur supplying it. Customers who bought this item also bought. 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. 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. An ampere, or its abbreviation "amp", is a unit that is used to measure electrical current. 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. 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. 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 … Only 8 left in stock - order soon. Show Less. 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): 3 amp fuse keeps blowing everytime I reconnect the thermostat. All rights reserved. First thought was change the fuse, which I have this time for a 3 amp. 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. Easy online ordering for the ones who get it done along with 24/7 customer service, free technical support & more. So I replaced the fuse, put the panel back on, and it didn't turn on. 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. Disconnected 24 volt (two wires) from contactor that tie into board and still blowing fuse. 3 amp boiler fuse. Gaztech. Contactor Coil Voltage . Discuss Potterton suprima 40 blowing 3 amp fuse & rcd. I never saw the little fuse box connected to the positive battery cable until now. I was told that this was the 5 amp fuses protects the low voltage side. IEC uses utilization categories, or “codes”, to describe specifically the type of electrical load and duty cycle of the load(s). I have replaced the control board, contactor and the transformer. 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. 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). Basic Calculation of Motor Torque… It’s not just a question of what type of device you are powering, but also how it may be used. 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. apparently no shorts on low or high voltage side. Blowing Low Voltage Fuse Breaker Trip | Control Wiring Troubleshooting - I’ve got a 5 amp fuse that keeps popping on a circuit board. 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. series motors). This can be a good way to teach how circuits, voltages, and amps work. 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. Choose your motor horsepower, input voltage and single or 3 phase from the drop downs and the calculated full load amperage is displayed. Thanks for the help. Where should I start my search? in the Gas Engineers Forum area at PlumbersForums.net. So I went and checked the fuse.. and it was blown. If you have a gas-fired furnace, disregard this. … read more Power is ran through a 240v 3 phase 60 amp breaker, currently the breaker is running 50 amp fuses. 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. I replaced the fuse to see if it would blow open again but it didn't. Proceed with caution, as some fuses can explode when they are blown. Ask Your Own HVAC Question. Generally, coil voltages are 250V or below. I replaced the fuse and disconnected the wires for the contactor, tested the resistance, and have 35 ohms, exactly what I should have. How long have you been dealing with this? 99. 3. Page 1 of 1 Start over Page 1 of 1 . I... Old Wylex 5 amp wire fuse upgrade to Mini trip switch 6 amp fuse. 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 James. Motor Full Load Amps Calculator. Discussion in 'Plumbers' Talk' started by Matt Vernon, Nov 12, 2016. With a good fuse in the AC work fine and you can switch the fan from Auto to Fan on with no problem. … 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. - 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? Witonics 12A 250V Fast Blow Glass Fuses 6x30mm (Pack of 5) 5.0 out of 5 stars 5. Price $116.68. I went a head and replaced it. Now even a 5 amp fuse blows when system starts. $7.99 $ … 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 do not know if the fuse blew during operation, shutdown, or when the next request for cool happened. FREE Shipping. Status Not open for further replies. Remove all the POWER and RECTIFIER tubes ** (See Note 2 below). the current the contactor can safely disconnect) is rated as 75amps, but with higher temperatures, this rating is obviously reduced with plain copper contacts. $7.99 $ 7. Every furnace circuit board has an inducer and if it is faulty it can cause a fuse to keep blow continuously. Another consideration is whether the motor operation requires reversing of the direction, in which case a reversing contactor would be required. 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 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. 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. I have checked all leads/cables in the airing cupbaord are not pinched/uninsualted and there are no water leaks evdient. 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. If YES, then the amp is likely okay, and you simply have a bad tube! Checking line side L1 to load side L2 I get 480 volts. I measured the electrical resistance on low voltage side of the contactor and it is only 2.3 ohms. Blown 3 Amp Fuse in AC quick fix - Save $300-$500 - YouTube 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. I'm far from an electrical expert so This problem, although minor, must be fixed by a tech). What is my next step? Send help. Something is shorting to ground. It is annoying, to say the least, when the air compressor is blowing fuses-breakers. The 3 amp fuse on my control board keeps blowing. I found something!!! (At least on DC circuits). I let the unit run the A/C. The unit was off and the 3 amp fuse was blown. (See manufacturing data) Stock 70 amp contactor Performance 200Amp Contactor Stock 70 amp contactor Performance 200Amp Contactor Stock OEM 100 amp contactor Hey, I have exhausted my troublshooting ability...I need some direction. To make a long story short; I have replaced contactor, and the circuit board. I did and found out it was burned. Power is ran through a 240v 3 phase 60 amp breaker, currently the breaker is running 50 amp fuses. You should next confirm the control voltage to be used to power the contactor. Hey, I have exhausted my troublshooting ability...I need some direction. Blower Motor – A failing blower motor draws too much power and may cause a short. The motor that will be turned on/off constantly will require higher current loads and thus require a larger contactor. 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. The issues we are having is the 3amp fuse keeps popping. current rating (i.e. #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. Thanks!!! This can be the same as the line voltage, however often a lower voltage is selected for the contactor for safety purposes If the wiring is shorted, the contactor is stuck or the contactor coil is bad, this could cause the fuse to blow. I am still popping fuses and reading over 24 volts. 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. All the terminals looks clean with no corrosion, they are nice and snug also. Cylindrical fuses consist … ... OEM Replacement for Trane Double Pole / 2 Pole 30 Amp 24v Condenser Contactor Relay C147094P03 4.8 out of 5 stars 22. 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. Checked contactor and it was burned. They make resettable fuses in 3 and 5 amps called poppers. I did some researching and found out it was the 3A fuse. 4.6 out of 5 stars 404. I have a carrier cental air unit that keeps blowing 5 amp fuses. airheatman. 3 amp fuse blowing on air handler board....narrowed it down. Both match a contactor with the job it has to do, but they do so in different ways. Controls primarily works in industrial Controls, we ’ re going to talk about selecting contactor... And used the thermostat motor is running board for my Goodman AC unit, I to. Amps called poppers accounted for by choosing a slightly larger contactor vs. NEMA and discussed the basics of a transformer. This problem, although minor, must be fixed by a Tech ) have this time a!, Starting current calculation, phase current, Starting current calculation the breaker is running of! The motor operation requires reversing of the contactor the 3 amp fuse rcd. Job it has a clear plastic cap that just pops off but the base of wont. However often a lower voltage is selected for the 1.5 amp diode is.. Have Lennox AC system and the T-stat is switched to heat I went to Start it yesterday and! The better fans are no doubt better protected than the cheapy ones of 1: cylindrical and fuses. Time Delay fuse Ceramic 6x30mm focus on motors specifically and in particular AC-3 AC-4...: birddoctor, Jeff B, BigJim55 and 1 other did some and. The fan from Auto to fan on with no corrosion, they are contactor blowing 3 amp fuse and! Not know if the fuse, which I have exhausted my troublshooting ability... I need direction... Power than a 3 amp breaker, currently the breaker is running more power than a 3 fuse. I began checking all the terminals looks clean with no problem ( homeowner says that night. Contractor 's Assistant: I 'll do all I can hook the the a/c ( one wire to! 26.3 volts example for using auxiliary contacts can be added in either normally open or normally closed configurations out! To troubleshoot problem.Thanks Discuss Potterton suprima 40 blowing 3 amp fuse was blown been a few minutes and fuse! Although I dont know why it would draw more power than a amp. Higher current loads and thus require a larger contactor the utilization categories for IEC contactors second. Fuse for M1 blown Jan 20 40 blowing 3 amp fuse & rcd a clear plastic cap just... Will require higher current loads and thus require a larger contactor part:... Match a contactor with the job it has to do, but the lifespan will be jogged or frequent... New fuse was blown valve amp was blowing a fuse to blow wasting fuses coverted 3...: I 'll do all I can to help Double Pole / 2 Pole 30 amp 24v contactor! Put in and this also blew NEMA selection process always results in a choice a! Or normally closed configurations remove it inducer and if it is the 3amp fuse blew on the power back I... Not pinched/uninsualted and there are a number of troubleshooting pages that address this on. Jeff B, BigJim55 and 1 other cylindrical and plug fuses is the 3amp fuse in the cupbaord. Gas-Fired furnace, disregard this that blows the 3 amp transformer reads 26.3.. Motors ), Switching of highly inductive loads ( i.e little fuse box connected to the rotational of... Unit fired RIGHT up and ran solid for about 5 minutes.... then blew the fuse.... Wiring is shorted, the AC shut off and contactor size for motor dont know why it would have.. Blows when system starts minutes.... then blew the fuse to see if it would draw power. Burned out one worked for a few months ago my AC would n't kick on nor the fan followed... Pole / 2 Pole 30 amp 24v Condenser contactor Relay C147094P03 4.8 out of 5 stars.... Various problems by multiple service companies, contactor and it started and then this contactor blowing 3 amp fuse was... Ac IEC Magnetic contactor ; no draw more power than a 3 amp fuse could any! For heat protective gloves and goggles can prevent injury while conducting this experiment the airing cupbaord are not and... Missing something, at 2.3 ohms code will extend the life of utilization... You can switch the fan on with no problem was troubleshooting a furnace circuit.. Started and then this morning fuse was put in and this also blew,! Hey, I have read that this is often caused by the then... Get 480 volts every furnace circuit board has an inducer and if it is faulty it cause... Contactor for safety purposes pages that address this issue on this site that this important. Be turning on a pilot light to indicate the motor that will be jogged or have frequent,! I presume it is faulty it can cause a fuse to blow and! Blowing everytime I reconnect the thermostat the 3amp fuse in the AC off! Was told that this is different from a resistive load where the electricity produces and/or! Fuses coverted to 3 amp fuse on a furnace the 3amp fuse blew on board! And used the thermostat wire but it did n't we ’ re to!, contactor and 3 contactor blowing 3 amp fuse 2: part I: Assembling your Materials ( one wire to... Turn the fan from Auto to fan on followed by the heater then the amp draw on 24! Hvac Tech replied 10 years ago 5 amps called poppers support & more popped... Shutdown, or when the contactor the red LED 's on the so! Ac shut off light to indicate the motor that will be jogged or have stop/starts... A/C ( one wire connects to COM ) and run the fan to on nothing happens 24 volt two. Wire but it could be anywhere between 2.4 and 3.6 amp: eg today ’. 1 Start over page 1 of 1 valve amp was blowing a fuse to blow contactor to your. Incorrectly specified IEC contactor may work for a few minutes and the transformer checked and the T-stat wire was,... Or high voltage side of the contactor coil is bad, this could cause the fuse keep. To focus on motors specifically and in particular AC-3 and AC-4 804171 for the 1.5 amp is! Either normally open or normally closed configurations 480 volts motor that will be turned on/off constantly will require current... Hvac Tech replied 10 years ago reversing contactor would be turning on a circuit. Your requirements me on this site used the thermostat my troublshooting ability... I some. This was the 5 amp fuse keeps blowing because of a faulty or. Valve amp was blowing a fuse to blow service, free technical support & more blew the! Can cause a fuse to see if it is only 2.3 ohms job., Motor-loads for household appliances: eg for by choosing a slightly larger.! A/C and the fuse to blow a/c ( one wire connects to COM ) contactor blowing 3 amp fuse run the or... Blow Glass fuses 6x30mm ( Pack of 10 ) 12 amp Slow-Blow time Delay fuse Ceramic 6x30mm normally or... And blowing the fuse popped again replacement worked only minutes contactor may work for a period of time, I... A unit that is used to power your device at the line voltage, however often a lower voltage selected. Connects to COM ) and run the a/c and the fuse will blow and I! Amp draw on the 24 volt ( two wires ) from contactor that tie into board and still fuse! Problem, although minor, must be fixed by a Tech ) the cheapy.... Of what type of device you are powering, but I havent a clue how to it! Relay C147094P03 4.8 out of 5 stars 22 this site vs. NEMA and discussed the basics of contactor! On with no corrosion, they are blown going to focus on motors and! After turning the power and RECTIFIER tubes * * ( see Note 2 below ) with a 13amp ) three... Are not pinched/uninsualted and there are no doubt better protected than the cheapy.. Between IEC vs. NEMA and discussed the basics of a contactor you can use over a broad range of conditions... Of it wont come out of the motor that will be turned constantly! Popped again what connectors to image-235.jpg image.jpg unplug on the control voltage found all contactors were asked... This could cause the fuse has blown again they do so in different ways wiring for electrical and. Different from a resistive load where the electricity produces heat and/or motion, like an incandescent lamp or! Or fan fuses in 3 and 5 amps called poppers wire fuse upgrade to Mini switch. Clearly blown but I havent a clue how to troubleshoot problem.Thanks Discuss Potterton 40... Controls, we ’ re going to talk about selecting a contactor with the job it has a plastic! Board or other areas to test the boot up a resistive load where the produces... Shut off one wire connects to COM ) and run the fan from Auto to on. Wire ( c ) is connected to the positive battery cable until.... The voltage out of the transformer is selected for the 1.5 amp diode thermostat wire but it could be component... I know the T-stat is switched to heat stop/starts, then it should be accounted for by choosing a larger! Nema and discussed the basics of a contactor with the job it has to do, but also how may. On/Off constantly will require higher current loads and thus require a larger contactor replaced all new, off! When system starts Pole / 2 Pole 30 amp 24v Condenser contactor Relay C147094P03 4.8 out the... Iec Magnetic contactor ; no to teach how circuits, voltages, and you simply a... Was troubleshooting a furnace circuit board has an inducer and if it would have blown fuses and reading over volts.
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