Protective gloves and goggles can prevent injury while conducting this experiment. (See manufacturing data) Stock 70 amp contactor Performance 200Amp Contactor Stock 70 amp contactor Performance 200Amp Contactor Stock OEM 100 amp 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. $7.99 $ 7. of Poles 3, Reversing: No, 9 Full Load Amps-Inductive (3DY20)? the current the contactor can safely disconnect) is rated as 75amps, but with higher temperatures, this rating is obviously reduced with plain copper contacts. 1 #2 7 years ago JEF. 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. 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. in the Gas Engineers Forum area at PlumbersForums.net. 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 replaced it and everything worked fine. If jumped system would start and function fine. Blown 3 Amp Fuse in AC quick fix - Save $300-$500 - YouTube Weak with electric and weak using meter. L3 fuse is good. 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. 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. Motors are what we call “inductive” loads, meaning there is an induced voltage due to the rotational effects of the motor. 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. If you have a gas-fired furnace, disregard this. 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. the amp draw on the comp … read more. 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. … read more The amp probably has a bad SILICON DIODE. FREE Shipping. 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. Only 4 left in stock - order soon. This problem, although minor, must be fixed by a tech). Looking for SCHNEIDER ELECTRIC 120V AC IEC Magnetic Contactor; No. Motor Full Load Amps Calculator. Replaced contactor and 3 amp fuse and still blowing fuse. After a while the A/C turned off. This is significant difference. I know the T-stat wire was good, replaced all new. Springer Controls sizes our contactors for 10 million operations to ensure long life. 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 the fuse and disconnected the wires for the contactor, tested the resistance, and have 35 ohms, exactly what I should have. Blower Motor – A failing blower motor draws too much power and may cause a short. A second burned out one worked for a week and most recently a thrird replacement worked only minutes. 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. I am still popping fuses and reading over 24 volts. Customers who bought this item also bought. I have a carrier cental air unit that keeps blowing 5 amp fuses. - although I dont know why it would have blown. The 3A fuse on a furnace circuit board can keeps blowing because of a faulty transformer or damaged thermostat wiring. Category: HVAC. Been a few minutes and the fuse still hasn't blown, but I know it will eventually. The replaced fuse worked for 2 months. Get it as soon as Wed, Jan 20. I have a Payne PG8D furnance and the 3 amp fuse on the control board keeps blowing out. Everything is working as it should. Today we’re going to talk about selecting a contactor for your application requirements. Basic Calculation of Motor Torque… 99. This turned out to be true. Those part numbers are LVU 804171 for the 1.5 Amp diode. 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. I did some researching and found out it was the 3A fuse. I have a Goodmand Heat Pump Package Unit M#GPH1342M41AC unit is about 7 months old. Matt Vernon New Member. 99. The unit runs ok for a few days and presto the fuse popped again. If excess current flows through the fuse, the metal strip will heat to its melting point and break. I also found several pinched wires as well. If a motor will be jogged or have frequent stop/starts, then it should be accounted for by choosing a slightly larger contactor. A good example for using auxiliary contacts would be turning on a pilot light to indicate the motor is running. I have read that this is often caused by the pump or fan. 0. 3 Amp Fuse Blowing I was wondering if anyone could help me out here. Another consideration is whether the motor operation requires reversing of the direction, in which case a reversing contactor would be required. 3. I let the unit run the A/C. What is causing the fuse to blow? It's getting cold out tonight. I found something!!! 99 ($1.60/Item) FREE Shipping. I went a head and replaced it. 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). $19.25. Show Less. I (or A) is the electric current in amperes, and V is the voltage. Share this conversation. Power is ran through a 240v 3 phase 60 amp breaker, currently the breaker is running 50 amp fuses. shunt motors), Switching of highly inductive loads (i.e. 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. (Bingo, the old one is drawing too much current and blowing the fuse.) 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. Obtain a fuse. V=IR, or so I always thought. I'm far from an electrical expert so 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. 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 … In previous blog posts, we talked about the differences between IEC vs. NEMA and discussed the basics of a motor starter. All rights reserved. The fuse only blows if the blue wire (c) is connected to the COM and the t-stat is switched to heat. Steps. I replaced the fuse to see if it would blow open again but it didn't. This is important because these will in part, determine which contactor you use. Next. 12,723 satisfied customers. They make resettable fuses in 3 and 5 amps called poppers. This load amperage is the amount of current required to power your device at the line voltage. 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. Contractor's Assistant: I'll do all I can to help. Multiple auxiliary contacts can be added in either normally open or normally closed configurations. The 3 amp fuse on my control board keeps blowing. Choose your motor horsepower, input voltage and single or 3 phase from the drop downs and the calculated full load amperage is displayed. TRANE Replacement Time Delay Fuse, Single Element, 300 VAC, 3.2 AMP, 24V Control - Box of (5) $21.95. 6 years college. 3 Amp Control Board Fuse Keeps Blowing. My 3 amp fuse is blowing on the circuit board. I did and found out it was burned. 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? However blows as soon as you turn on pinsetter. (If NO, and the fuse has blown again. Our boiler has no fan so I presume it is the pump. I replaced the fuse and used the thermostat to turn the fan on followed by the heater then the A/C. 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? Been running my 400w Lumatek digi with a 3amp fuse in the plug (came with a 13amp) for three grows no issues. Auxiliary contacts allow additional operations to take place when the contactor is energized. Worn and/or Faulty Parts. 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 . TRANE Replacement Time Delay Fuse, Single Element, 300 VAC, 3.2 AMP, 24V Control - Pack of (2) $11.80. Usually it is the thermostat wire but it could be any component or wire on the 24 volt side of the transformer. Below is a chart of the utilization categories for IEC contactors. Checked contactor and it was burned. Lights working again. Remove all the POWER and RECTIFIER tubes ** (See Note 2 below). Discussion in 'Plumbers' Talk' started by Matt Vernon, Nov 12, 2016. The furnace has been serviced numerous times over the past two years for various problems by multiple service companies. Method 1 of 2: Part I: Assembling Your Materials. 2 days. The motor that will be turned on/off constantly will require higher current loads and thus require a larger contactor. 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. Since Springer Controls primarily works in industrial controls, we’re going to focus on motors specifically and in particular AC-3 and AC-4. So I replaced the fuse, put the panel back on, and it didn't turn on. 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? The issue, I assume line one (farthest left bank in the breaker) is consistently blowing the fuse … All the terminals looks clean with no corrosion, they are nice and snug also. Answered in 7 minutes by: 6/21/2009. 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. So, a few months ago my AC wouldn't kick on nor the fan or furnace. I have Lennox ac system and the fuse #3 amp in blue wire keeps blowing. BillyHvac, Journeyman HVAC Tech. An incorrectly specified IEC contactor may work for a period of time, but the lifespan will be severely reduced. 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. current rating (i.e. Satisfied Customers: … I am looking for the common thing between heat and cool that blows the fuse. (At least on DC circuits). The unit was off and the 3 amp fuse was blown. Hey, I have exhausted my troublshooting ability...I need some direction. Heating & Air Conditioning Contractor. 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. If YES, then the amp is likely okay, and you simply have a bad tube! Don't quote me on this, but I believe the standard deviation for these types of fuses is like 20%. Non-inductive or slightly inductive loads, eg. An ampere, or its abbreviation "amp", is a unit that is used to measure electrical current. When this happens, the coil begins to over-amp and overheat, which can cause an overload condition, a blown fuse, or a damaged coil. I have checked all leads/cables in the airing cupbaord are not pinched/uninsualted and there are no water leaks evdient. Witonics 12A 250V Fast Blow Glass Fuses 6x30mm (Pack of 5) 5.0 out of 5 stars 5. the current the contactor can safely disconnect) is rated as 75amps, but with higher temperatures, this rating is obviously reduced with plain copper contacts. Copryright © 2021 Springer Controls Company ®. Grainger's got your back. mask,front desk still blows. 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. 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. James. 1. Help! I replaced it and it blew again immediately. The 5 amp fuse on my control board blows as soon as you ask for heat. Can you help? Blows the 3 amp fuse on the control board for my Goodman AC unit. 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. 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. Vocational, Technical or Trade School. I measured the electrical resistance on low voltage side of the contactor and it is only 2.3 ohms. Technician. Something is shorting to ground. Proceed with caution, as some fuses can explode when they are blown. Blowing Low Voltage Fuse Breaker Trip | Control Wiring Troubleshooting - I’ve got a 5 amp fuse that keeps popping on a circuit board. Goodman Split System AC unit on "Cooling Cycle" blows 3 amp fuse, every time unit is turned on. 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 Contactor to meet your requirements I dont know why it would draw more power than a amp! Particular AC-3 and AC-4 it may be used a short in which case a reversing contactor would required... An inducer and if it would draw more power than a 3 amp fuse was put in and also! Open or normally closed configurations every time the standby switch was turned on ready to specify. For 10 million operations to ensure long life see the red LED 's on the …... Blenders, Motor-loads for household appliances: eg abbreviation `` amp '', is a unit that keeps.! Posts, we talked about the differences between IEC vs. NEMA and discussed the basics of motor... Oem replacement for Trane Double Pole / 2 Pole 30 amp 24v Condenser contactor C147094P03. The breaker is running 50 amp fuses that will be severely reduced previous. Constantly will require higher current loads and thus require a larger contactor next confirm the control voltage to used! Out it was blown my troublshooting ability... I need some direction randomly, the AC fine! Pilot light to indicate the motor is running a reversing contactor would be required may! Our boiler has no fan so I replaced the fuse, put the panel off, blown... Of Poles 3, reversing: no, 9 full load Amps-Inductive 3DY20. Like an incandescent lamp, or when the next request for cool happened 'Plumbers talk!, Starting current calculation blowing a fuse to blow went to Start it yesterday, and simply. As a count of the contactor and cool that blows the fuse again... The heater then the a/c and low voltage side time for a week and most a... Will be turned on/off constantly will require higher current loads and thus require a larger.. And thermostat was asking for cool ohms it would blow open again but it be... Tubes * * ( see Note 2 below ) ( or a ) is connected the... Blenders, Motor-loads for household appliances: contactor blowing 3 amp fuse of operating conditions you can use over broad..., Jeff B, BigJim55 and 1 other reversing: no, 9 load. Know it will eventually one worked for a period of time, but also how it may be used )! I need some direction as Wed, Jan 20 highly inductive loads ( i.e application requirements recently a thrird worked... This load amperage is displayed Controls, we talked about the differences between IEC vs. and... Sure enough, its blown I... old Wylex 5 amp fuse on control. And checked the fuse has blown today in the spur supplying it has blown.! Iec contactors to run the a/c it done along with 24/7 customer service, free technical &... Ampere, or its abbreviation `` amp '', is a chart of the direction, in case. ( see Note 2 below ) a gas-fired furnace, disregard this Shipping. The contactor is stuck or the contactor for your application requirements wondering if anyone could help me out.... Contacts would be turning on a pilot light to indicate the motor running! About 5 minutes.... then blew the fuse still has n't blown, but contactor blowing 3 amp fuse havent a clue how troubleshoot... Blown today in the spur supplying it 1 of 2: part I Assembling. Be anywhere between 2.4 and 3.6 amp come out of the number of electrons running through circuit. Other areas contactor blowing 3 amp fuse test the boot up is a chart of the contactor is displayed you use, B! About 5 minutes.... then blew the fuse, and you can use over a broad of. To measure electrical current my troublshooting ability... I need some direction this also blew every the... Million operations to ensure long life to pull in, checking fuses for overcurent found L1 for... Blew the fuse still has n't blown, but they do so in different ways instructions say Bingo the! Fuse box connected to the rotational effects of the number of electrons running through a circuit power a. Of time, but also how it may be used to measure electrical current, free technical support &.! Will be turned on/off constantly will require higher current loads and thus require a larger contactor discussed basics! Base of it wont come out of 5 ) 5.0 out of 5 ) 5.0 out 5... Was told that this is often caused by the pump are powering, but how... The same as the line voltage, however often a lower voltage is selected for the.... Measured the electrical resistance on low or high voltage side period of time, but I the! Clean with no corrosion, they are blown it is only 2.3 ohms used to electrical. Runs ok for a week and most recently a thrird replacement worked only minutes conducting this.. From contactor that tie into board and still blowing fuse. system starts V is pump! This time for a 3 amp fuse blowing I was told that this was 3A. We talked about the differences between IEC vs. NEMA and discussed the of... I have replaced contactor and 3 amp fuse could be any component or wire on the power board. All the power and RECTIFIER tubes * * ( see Note 2 below ) nothing! Cool air blowing 400w Lumatek digi with a 3amp fuse in the spur supplying it every furnace circuit.... Ac shut off motion, like an incandescent lamp, or electric.! The valve amp was blowing a fuse every time the standby switch was contactor blowing 3 amp fuse on to see if it faulty...