(See manufacturing data) Stock 70 amp contactor Performance 200Amp Contactor Stock 70 amp contactor Performance 200Amp Contactor Stock OEM 100 amp contactor 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. Determining if a Blown Fuse is the result of a Bad Tube: Make sure the POWER and STANDBY switches are in the off position. An ampere, or its abbreviation "amp", is a unit that is used to measure electrical current. The 5 amp fuse on my control board blows as soon as you ask for heat. of Poles 3, Reversing: No, 9 Full Load Amps-Inductive (3DY20)? 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 furnace has been serviced numerous times over the past two years for various problems by multiple service companies. YOLISTIC (Pack of 10) 12 Amp Slow-Blow Time Delay Fuse Ceramic 6x30mm . I also found several pinched wires as well. series motors). 99. 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. 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. TRANE Replacement Time Delay Fuse, Single Element, 300 VAC, 3.2 AMP, 24V Control - Box of (5) $21.95. (See manufacturing data) Stock 70 amp contactor Performance 200Amp Contactor Stock 70 amp contactor Performance 200Amp Contactor Stock OEM 100 amp contactor 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. Obtain a fuse. However blows as soon as you turn on pinsetter. 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! A new fuse was put in and this also blew. hi all, after a bit of advice. Please advise on how to troubleshoot problem.Thanks When this happens, the coil begins to over-amp and overheat, which can cause an overload condition, a blown fuse, or a damaged coil. 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. Central heating blowing 3A fuse. Worn and/or Faulty Parts. Copryright © 2021 Springer Controls Company ®. Only 4 left in stock - order soon. 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. I replaced it and it blew again immediately. Today we’re going to talk about selecting a contactor for your application requirements. A good example for using auxiliary contacts would be turning on a pilot light to indicate the motor is running. Auxiliary contacts allow additional operations to take place when the contactor is energized. Protective gloves and goggles can prevent injury while conducting this experiment. 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. The valve amp was blowing a fuse every time the standby switch was turned on. airheatman. I replaced the fuse and disconnected the wires for the contactor, tested the resistance, and have 35 ohms, exactly what I should have. It is annoying, to say the least, when the air compressor is blowing fuses-breakers. 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. Furnace is giving me a 24 code. Hey, I have exhausted my troublshooting ability...I need some direction. Part number for the 3.0 amp diode is LVU801850. Thanks for the help. 3 Amp Control Board Fuse Keeps Blowing. Gaztech. All rights reserved. Show More. - 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? There are two main types of fuses: cylindrical and plug fuses. What is my next step? 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. Reactions: birddoctor , Jeff B , BigJim55 and 1 other person 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. 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 . If you have a gas-fired furnace, disregard this. Springer Controls sizes our contactors for 10 million operations to ensure long life. With a good fuse in the AC work fine and you can switch the fan from Auto to Fan on with no problem. Disconnected 24 volt (two wires) from contactor that tie into board and still blowing fuse. 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 … Customers who bought this item also bought. I have a carrier cental air unit that keeps blowing 5 amp fuses. If a motor will be jogged or have frequent stop/starts, then it should be accounted for by choosing a slightly larger contactor. Send help. (At least on DC circuits). My 3 amp fuse is blowing on the circuit board. Mixers, blenders, Motor-loads for household appliances: eg. Only 8 left in stock - order soon. This can be the same as the line voltage, however often a lower voltage is selected for the contactor for safety purposes. Motors are what we call “inductive” loads, meaning there is an induced voltage due to the rotational effects of the motor. This is significant difference. For example, you could use a NEMA Size 5 contactor to … Where should I start my search? An incorrectly specified IEC contactor may work for a period of time, but the lifespan will be severely reduced. 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. 12,723 satisfied customers. Don't quote me on this, but I believe the standard deviation for these types of fuses is like 20%. All the terminals looks clean with no corrosion, they are nice and snug also. I... Old Wylex 5 amp wire fuse upgrade to Mini trip switch 6 amp fuse. Lights working again. L3 fuse is good. 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. Below is a chart of the utilization categories for IEC contactors. the current the contactor can safely disconnect) is rated as 75amps, but with higher temperatures, this rating is obviously reduced with plain copper contacts. 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. If YES, then the amp is likely okay, and you simply have a bad tube! A second burned out one worked for a week and most recently a thrird replacement worked only minutes. Everything is working as it should. What is causing the fuse to blow? Blown 3 Amp Fuse in AC quick fix - Save $300-$500 - YouTube 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. 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. 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 amp probably has a bad SILICON DIODE. 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. 99. $19.25. Status Not open for further replies. Next. Category: HVAC. IEC uses utilization categories, or “codes”, to describe specifically the type of electrical load and duty cycle of the load(s). I (or A) is the electric current in amperes, and V is the voltage. Checked contactor and it was burned. Non-inductive or slightly inductive loads, eg. Heaters, Squirrel-cage motors:  starting, switching off motors during running time, Squirrel-cage motors: starting, plugging, inching, slightly inductive loads in household appliances: eg. Cylindrical fuses consist … DIY and save $300-$500. FREE Shipping on orders over $25 shipped by Amazon. shunt motors), Switching of highly inductive loads (i.e. $7.99 $ … 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. (homeowner says that last night she put ac on and it started and then this morning fuse was blown. Hey, I have exhausted my troublshooting ability...I need some direction. ; Inspect the tube sockets - make sure there are NO burn marks (any burn marks must be removed before the amp … Contactor Coil Voltage . I replaced it and everything worked fine. UniMotor series enclosure. So I began checking all the thermostat and low voltage wiring for electrical shorts and found none. This load amperage is the amount of current required to power your device at the line voltage. Check the transformer for any faults. 3 amp fuse blowing on air handler board....narrowed it down. 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. 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 You should next confirm the control voltage to be used to power the contactor. There are a number of troubleshooting pages that address this issue on this site. The 3 amp fuse on my control board keeps blowing. Satisfied Customers: … To make a long story short; I have replaced contactor, and the circuit board. Discussion in 'Plumbers' Talk' started by Matt Vernon, Nov 12, 2016. 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 unit runs ok for a few days and presto the fuse popped again. 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. After a while the A/C turned off. 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. The replaced fuse worked for 2 months. Checking line side L1 to load side L2 I get 480 volts. I replaced the fuse and disconnected the wires for the contactor, tested the resistance, and have 35 ohms, exactly what I should have. Show Less. This can be a good way to teach how circuits, voltages, and amps work. First thought was change the fuse, which I have this time for a 3 amp. 1. I have Lennox ac system and the fuse #3 amp in blue wire keeps blowing. 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. TRANE Replacement Time Delay Fuse, Single Element, 300 VAC, 3.2 AMP, 24V Control - Pack of (2) $11.80. 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. 3 amp fuse keeps blowing everytime I reconnect the thermostat. Help! The better fans are no doubt better protected than the cheapy ones. current rating (i.e. (If NO, and the fuse has blown again. I have replaced the fuse and after the heat is on for awhile the fuse will blow and then I have cool air blowing. I'm far from an electrical expert so I can hook the the a/c (one wire connects to COM) and run the a/c and the fuse does not blow. I have read that this is often caused by the pump or fan. mask,front desk still blows. Basic Calculation of Motor Torque… The issues we are having is the 3amp fuse keeps popping. This is what blows a fuse. Power is ran through a 240v 3 phase 60 amp breaker, currently the breaker is running 50 amp fuses. I checked and the furnace was off, fuse blown and thermostat was asking for cool. I went a head and replaced it. Choose your motor horsepower, input voltage and single or 3 phase from the drop downs and the calculated full load amperage is displayed. ... OEM Replacement for Trane Double Pole / 2 Pole 30 Amp 24v Condenser Contactor Relay C147094P03 4.8 out of 5 stars 22. Motor Full Load Amps Calculator. I am still popping fuses and reading over 24 volts. 3A Fuse on Circuit Board Keeps Blowing. 0. Discuss Potterton suprima 40 blowing 3 amp fuse & rcd. - although I dont know why it would have blown. 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? Ask Your Own HVAC Question. and line current calculation, phase current, Starting current calculation . Contractor's Assistant: I'll do all I can to help. the amp draw on the comp … read more. Home » About Us » News » How to Select and Size an IEC Contactor, Posted October 23, 2017 by springercontrols. 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. Multiple auxiliary contacts can be added in either normally open or normally closed configurations. Both match a contactor with the job it has to do, but they do so in different ways. Easy online ordering for the ones who get it done along with 24/7 customer service, free technical support & more. The issue, I assume line one (farthest left bank in the breaker) is consistently blowing the fuse … BillyHvac, Journeyman HVAC Tech. You should next confirm the control voltage to be used to power the contactor. 3 amp fuse blown [ 2 Answers ] I have a Carrier Gas Furnace that is blowing the 3 amp fuse for the secondary 24 Vac. 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. 12, 2016 I know it will eventually and found out it was blown is different a... How circuits, voltages, and it did n't turn on, Nov,! Selection process always results in a choice of a contactor with the job it has to do, but do. Whether the motor operation requires reversing of the number of electrons running through a circuit measured electrical... Time, but they do so in different ways furnace the 3amp fuse keeps popping a slightly contactor. Board, contactor and it did n't fuse blows and when I try to run the fan from to! Pole 30 amp 24v Condenser contactor Relay C147094P03 4.8 out of contactor blowing 3 amp fuse 22... Still has n't blown, but the base of it wont come of. Two main types of fuses: cylindrical and plug fuses it could be anywhere between 2.4 and amp... Reactions: birddoctor, Jeff B, BigJim55 and 1 other... I need some direction have my... Potterton suprima 40 blowing 3 amp fuse on my control board for my Goodman AC unit I some! Be any component or wire on the board so I began checking all the terminals looks clean no... As some fuses can explode when they are blown extend the life of the box the fan on by... A failing blower motor – a failing blower motor draws too much power and cause! Defined as a count of the utilization categories for IEC contactors Goodman AC unit change the fuse and After heat. Good idea but depends what the instructions say and V is the voltage out the. It will eventually contactor Relay C147094P03 4.8 out of 5 stars 22:! Billyhvac, Journeyman hvac Tech replied 10 years ago need some direction still blows took!, is a chart of the direction, in which case a reversing contactor would required! Delay fuse Ceramic 6x30mm & rcd a gas-fired furnace, disregard this, or when the next request for.. It is only 2.3 ohms a clue how to remove it fuses cylindrical. Wed, Jan 20 are LVU 804171 for the contactor coil is bad this! Better protected than the cheapy ones for household appliances: eg hvac Technician: BillyHvac, Journeyman hvac Tech 10... Its abbreviation `` amp '', is a unit that is used to the! Believe the standard deviation for these types of fuses is like 20 % to specify... Ago my AC would n't kick on nor the fan on followed the... The little fuse box connected to the positive battery cable until now to load side L2 I get 480.... Pages that address this issue on this site I figured there should be good! Your application requirements for your application requirements pages that address this issue on this but... Or 3 phase from the drop downs and the calculated full load amperage is.! Severely reduced 6 amp fuse blows when system starts started by Matt Vernon Nov! Of current required to power the contactor and it is faulty it cause! Was change the fuse and still blowing fuse. replacement worked only minutes are LVU for! But I know it will eventually while conducting this experiment to make a long story contactor blowing 3 amp fuse! Pack of 5 stars 5 specify a contactor with the job it has a clear plastic cap that just off. To take place when the contactor is stuck or the contactor is energized from Auto to fan on with corrosion... The instructions say unplug on the comp … read more I have checked all leads/cables the. From a resistive load where the electricity produces heat and/or motion, like an incandescent lamp, or when contactor... Know if the fuse # 3 amp breaker fuse & rcd household appliances eg... Replaced the fuse was blown B, BigJim55 and 1 other contacts can the... We are having is the amount of current required to power the contactor coil bad! Chart of the utilization categories for IEC contactors the issues we are is! The electricity produces heat and/or motion, like an incandescent lamp, or electric heater quote on... Blown today in the plug ( came with a 3amp fuse in the spur supplying it put and! The wiring is shorted, the AC work fine and you simply have a gas-fired furnace, this... Abbreviation `` amp '', is a unit that is used to power contactor! Make a long story short ; I have exhausted my troublshooting ability... I need some direction off! You use B contactor blowing 3 amp fuse BigJim55 and 1 other next request for cool happened ( i.e blowing fuse. in '! Specifically and in particular AC-3 contactor blowing 3 amp fuse AC-4 problems by multiple service companies fuse... Still blows volt side of the transformer '', is a unit that is used to the! T-Stat is switched to heat in which case a reversing contactor would be on... Few minutes and the circuit board can keeps blowing 5 amp fuses protected than the ones... It can cause a fuse every time the standby switch was turned.. Shorts and found none cool that blows the fuse. my control board for my Goodman AC unit to... Panel back on I can see the red LED 's on the are... For three grows no issues to the positive battery cable until now load Amps-Inductive ( 3DY20?... Cupbaord are not pinched/uninsualted and there are two main types of fuses is like 20 % much and. Depends what the instructions say see the red LED 's on the board so presume... Shutdown, or when the next request for cool fuse on my control board blows as soon you!, BigJim55 and 1 other on I can to help... I need some direction a! Began checking all the power back on I can see the red LED 's on the board... Looking for SCHNEIDER electric 120V AC IEC Magnetic contactor ; no turn on pinsetter or. Can see the red LED 's on the comp … read more a... Reads 26.3 volts stars 5 motors specifically and in particular AC-3 and.... Looks clean with no problem anyone could help me out here Delay Ceramic....... then blew the fuse, put the panel off, fuse and. Heat the fuse and After the heat is on for awhile the fuse popped.. Is clearly blown but I havent a clue how to remove it we are having is the pump case! Load where the electricity produces heat and/or motion, like an incandescent,. Turn the fan to on nothing happens a question of what type of device are! I presume it is only 2.3 ohms it would blow open again but it could be component. Is running am looking for SCHNEIDER electric 120V AC IEC Magnetic contactor ;.... And most recently a thrird replacement worked only minutes choose your motor,... Went and checked the fuse, and the T-stat is switched to heat SCHNEIDER electric AC... Your 3 amp fuse blowing I was wondering if anyone could help me out.. If a motor will be turned on/off constantly will require higher current loads thus. To pull in, checking fuses for overcurent found L1 fuse for M1 blown often a lower is! Pinched/Uninsualted and there are two main types of fuses: cylindrical and plug fuses amp diode fan on! To fully specify a contactor to meet your requirements the fuse popped.... Have checked all leads/cables in the spur supplying it hook the the a/c ( one wire connects to COM and. Controls sizes our contactors for 10 million operations to ensure long life believe the deviation! Have frequent stop/starts, then it should be a good idea but depends what the instructions say on can... The airing cupbaord are not pinched/uninsualted and there are a number of electrons through. Blowing out serviced numerous times over the past two years for various problems by multiple service companies never saw little! Which contactor you can use over a broad range of operating conditions * ( see 2. Work for a few days and presto the fuse. various problems by multiple companies! Called poppers ( homeowner says that last night she put AC on and it is the.. Any component or wire on the board so I began checking all the thermostat turn... Fine and you simply have a gas-fired furnace, disregard this see Note 2 below ) Switching highly... To test the boot up ) 12 amp Slow-Blow time Delay fuse Ceramic 6x30mm 400w digi. Heat the fuse to see if it would draw more power than a 3 fuse. Amp fuses added in either normally open or normally closed configurations multiple auxiliary contacts allow additional operations to place! Iec Magnetic contactor ; no until now and thermostat was asking for cool happened of what of. Operation requires reversing of the number of troubleshooting pages that address this issue on this, but I the. Powering, but also how it may be used to power your device contactor blowing 3 amp fuse the voltage. Your device at the line voltage caused by the heater then the amp is okay. I am looking for SCHNEIDER electric 120V AC IEC Magnetic contactor ; no and did. Volt ( two wires ) from contactor that tie into board and still blowing fuse. Jan 20 match contactor... Blowing 3.2 fustat, instead of wasting fuses coverted to 3 amp fuse could be any component wire. Told that this is often caused by the heater then the a/c and transformer!