If you can plug the heater into a regular wall outlet, the specified voltage should be 120 volts. Save Share. 0.3 kW is easily got with a 3 kW element running at half voltage so the question remains how long will it take to get to "final temperature" and I'm not able to answer this but one interesting observation is that nichrome wire, for a 3 kW heater on ~230V has a cold resistance of about 15.7 ohms check this wiki page out. Attempting to hardwire out to a 120V load without the use of a transformer will result in load drops and possible load damage! The 208V being needed as an alternative to the household 240V. Can you run 240v on 208v? See thread248-278883: Question on transformer requirement for HVAC Controls Card. heat. Can he use a shared neutral setup? a well pump, stove, dryer). No. Even so, if the nameplate said 208 only I think I would get another heater. Asked By: Dabi Luthmann | Last Updated: 13th February, 2020, 220-230-240 (depends on utility) is the standard nominal 1-phase voltage across both legs of the line (120 nominal being the voltage from either leg to neutral). I already know what happens if you would run a 240v baseboard on a 120v circuit, the baseboard heater would draw 1/4 the power. its 100% free and easy, Once registered you will have access to the technical forums, Be sure to click over to the new members forum and introduce yourself after registering! posted by Chuckles at 1:15 AM on October 31, 2005 Discuss please. All of these units default to 208v out and can be configured to 240v via the network management card or LCD interface. You can’t get it directly, though there’s a lot of equipment rated for 240V (usually specified at 230V) operation, that will still function at 208V, though it will produce 25% less power at that voltage. It may not display this or other websites correctly. I have no experience with such things. We have a 30 amp, 240V floor sanding machine. Sometimes the nameplate will state 208-240v as acceptable voltage ranges. My understanding is that in large buildings you see 120V 3 phase distribution, where 120V comes from a particular phase to neutral and 208V from one phase to another. (Output wattage will vary) Big thing is to look at the nameplate, one thing you sometimes can't do when you purchase stuff online.It could be a typo at the website. Welcome to Hvacproforums, an interactive community exclusively for HVAC professionals. But it should be lower amps with higher voltage. I have read one advantage of motors with higher voltage (440 for example) is that the wiring can be smaller and the motors smaller for the same HP output. What is the difference between 240v and 208v? Hi Kammy, First, let's get a minor detail clarified. So, a, The most common commercial building electric service in North America is. It will be hotter on 240 volts compared with on 208 volts. Standard appliance ratings allow for a 10% +/- on voltage. Click to see full answer Similarly, will a 208v heater work on 240v? Qmark Heater 5000W Electric Garage Heater, 17065 BTU/H, 208V/240V (FUH54) QMK-39987 $108.50 Each King Heat 10kW Heavy Duty Compact Unit Heater, 1000 Sq Ft, 725 CFM, 1 Ph, 41.6 Amp, 208V/240V, Gray (SKB2410-1-T-B) KNG-SKB24101TB Most modern devices can support this, but you need to check the device identification plate to be powered. THe resistance is the same, so the amperage goes up when the voltage increases. If you dont understand why its poping 45 amp fuses while pulling 37 amps I dont understand that either. Today, phone call with no heat. I would wire it up and put an amp probe on it, … Can I connect this to a 208V supply or must I re-size any items in the space heater I don't use 3 phase very often, but I do work with 240V all the time at work. It is basically a large compressor and controls. I think it would work if the wire size was large enough for the amperage and the fuses were larger. If your phase converter is actually putting out 220V you should be fine, but I suspect if your power is anything like mine, you will be closer to 240V. One may also ask, is 208v and 240v the same? 208V three phase is obtained by taking two legs of three-phase power. Most devices designed for 220, Motors are rated for 10% over or under the nameplate voltage listed on the motor. Do you have a link to the heater? Although transfer points can be widened to allow the unit to function online with a higher input voltage, the unit is not designed for this and will ultimately run into issues. The power supply has a black wire and a red wire. If you absolutely have to run it off 240V, then you can install a small, single phase, boost transformer to go from 208V to 240V. 208V is part (two hot wires) of a three phase grounded wye system. A commonly used analogy is to compare electricity to water in your pipes at home. I friend of mine had his 40 gallon whirlpool water heater rust out. If its why its pulling more amps at a higher voltage its ohms law. 240V space heater to 208V supply [ 1 Answers ] I purchased a used construction 240V space heater (4.8KW) 12/2 cabtire wiring (rated 20A). The power I have coming in is 240V 3 phase. The resistance is the same, so with higher voltage the amp draw is higher. Except for the reduced output, the 208 volt supply should not cause any of the other problems mentioned. Another concern is the motor appears to be for a 50Hz three phase power supply, but the power supply on site could be at 60Hz 208v, so we must take that into consideration, too. If heaters (Warren) are rated for 208V, why would a 240V system not work? This is a NEMA requirement. I hate to say it, but he may not have an easy fix for this.... so with higher voltage the amp draw is higher. Does Hermione die in Harry Potter and the cursed child? Why is preventive strategies important for the care industry? If the device identification plate indicates that it can work on 208v (more than 220v or 240v), you are fine. We have a lot of fun, but make no mistake, we are pros. Even if it's not, any 240V-rated heater can be run on 208 at reduced power. However, a 208V-only heater on 240V will run at 33% higher power and this could cause overheating. The collective years of HVAC experience and the knowledge our forum members share make this an invaluable resource for those in the HVAC industry. We tried for years using 208/230 motors on some of there pumps and AHU's and learned the hard way it just wasn't going to work.. However, the fryer I found is 15amp, 60Hz, and 208v. Contractor finds 4 of 6 45A fuses blown in the heater pack. We went and purchased a new one. As expected, being a resistive device, when the Voltage goes up, the Current goes up, and the Power (which is also heat delivered) goes up. I can tell you that every house I work in is different. In this case the motor is overvoltaged by ~ +4% and that's fine. Do not plug it into a standard 120V house circuit. 208 V is 13.3% lower. The sum of the two is 208V. Look at the amp draw and wattage for one of these heaters. Reply. Subsequently, question is, can you get 208v single phase? Thus, the current draw for a 1,500-watt heater is 12.5 amps. When you turn on the hot water in your faucet, water flows from the water heater, through the pipes, and into your sink. When one waveform is at its peak, measuring 120V, the other is only part of way through its cycle, measuring only 88V. Voltage is simply the difference in potential electrical force between two points. What cars have the most expensive catalytic converters? The difference between 208V three phase, and 240V single phase, is how the voltage is derived. Building is 240V. Do-it-yourselfers and Homeowners are encouraged to seek information elsewhere. Some apartment buildings are fed by a 120/208 system and each unit may have a single phase panel but it will be 208 instead of 240 because it was derived from a 120/208 3 phase system. If its why its pulling more amps at a higher voltage its ohms law. 240 - 24 is 216, obviously not within the 208 volts you say you have. Original Poster 4 years ago. 208 usually denotes a voltage available in commercial buildings with three phase service. Improve this question. Besides, will a 208v heater work on 240v? But you can get 120V, phase to neutral. If you wanted to run a 240v ac baseboard heater on 120v ac couldn't you just just use a 120v ac to 240v ac step-up tranformer? 208 volts does come from a three phase system. I have 100amp 240v 3phase cable coming into the main breaker box of a food cart. 4. share. JavaScript is disabled. Voltage in my shop is about 240V. I was thinking I would install a smaller drive pulley to run the pump near its low end rpm range, and will probably set my pressure switch to cut out around 140psi. level 2. (Ex: SU5000T, SUA3000XLT, etc). How many amps is a 50 kva transformer good for? Many (probably most) heating appliances are rated for both 208 and 240V operation. For a better experience, please enable JavaScript in your browser before proceeding. How do I connect this wire to get this to work? No, you cannot get 240V when the transformer nameplate says 208V. It's a 208 Rated heater. 208v to a 240v dryer. We have a couple of buildings we take care of that it has to be 208v rated replacement parts and 208 only. The resistance is the same. A 240 volt resistance heater supplied by 208 volts will have a heat output of 75% of the 240 volt rating. A product’s voltage rating doesn’t indicate how much power it uses. The two output legs are 180 degrees out of phase and from hot to hot they will measure 208v or 240v. The wrinkle with three phase power comes when you would like to power 240v devices (e.g. I've been told that the power supply is only 110v even though the breaker is double. I have never dealt with 208V power before. Using a 240 volt rated device used on 208 volts can be done, but at a wattage loss of the unit. 240 Volt heating circuits are more common because it reduces the Amp draw on your breaker/fuse panel, as the chart shows, you can place more heaters on a 20 Amp 240 Volt circuit (maximum of 3840 Watts) versus a 120 Volt circuit (maximum of 1920 Watts). Inside your water heater, water doesn’t move around much until you turn on a faucet. But what does that mean? There is also a 120/240 3 phase delta system which as a wild leg that can't be used for 120 volt loads. The electric griddle is 240v, 15amp, so no problems there. Many (probably most) heating appliances are rated for both 208 and 240V operation. voltage= ampsXresistance. A 1500 Watt heater will cost the same to run whether it is 120 or 240 Volt. Today, phone call with no heat. Copyright 2020 FindAnyAnswer All rights reserved. Voltage ranges from as low as 205V up to 245V and everything in between. The panel has a sticker that calls for 208V 3-phase. You may have some grounding issues. Only the businesses use the third phase, and his panel is run by two of the legs. Do not run a 208 volt only heater on 240 volts if it has moving parts such as a motor. It can run on 208, you just need to turn the heat up a little to get the penetration. Jump to Latest Follow 1 - 20 of 24 Posts. From recent threads I know that 208-220v motors are considered OK on 240V supply- and that 208V and 200 V are not considered OK as it is over the 10% "rule". I'll add that most heaters are 208-240 volt, and can be ran on any voltage in that area. Report Save. Dual rated (208/240v) systems have lower current ratings at higher voltages. When using 120/208V single phase, you will use any two of those same three hot conductors, with the two waveforms peaking 120 degrees apart from each other. Heaters were pulling 37 amps two weeks ago at startup. That one is a tough call. Connect (1) 120V 1 Phase power wire to the 1 Pole CB. Hvacproforums is self supporting ...there are NO advertisers here. There's maybe a 50/50 chance that you can feed the kiln with single phase 208V and it'll still run properly. What's the difference between Koolaburra by UGG and UGG? Because these heating appliances are essentially just big resistors, is it possible to plug straight into a 240v line? On a 10 kw heater you use a 60 amp breaker at 240v and a 50 amp breaker on a 208 V. I'm with Tuna. You must log in or register to reply here. If the device’s nameplate states that it can run at 208v (in addition to say 220v or 240v), you are fine. Even if it's not, any 240V-rated heater can be run on 208 at reduced power. 240V single phase is obtained by taking a single leg of three-phase power. Looking at the Warren website they have stock heaters that are rated for 208/230/240. If you dont understand why its poping 45 amp fuses while pulling 37 amps I dont understand that either. At 60Hz, the motor will run at 20% higher speed than it would at 50Hz, so … (208V). Those involved in the HVAC industry are urged to register. What is the difference between 208 and 230 volts? Do you have 208 at the unit when it's under a load? However, a 208V-only heater on 240V will run … When I went to connect it, I noticed that the water heater has a red and a black wire. You are using an out of date browser. Connect (1) Neutral wire to the Neutral Bar. Apartment buildings often do have 208Y/120 service, with a particular apartment receiving only single phase 208/120. The compressor motor and several of the control components have plates that indicate 240v. Running a 208V (only) heater on 240 V wil also result in more current, and more power, but will probably also cause the heater to overheat, as it is not designed to deliver that much power/heat. Contractor finds 4 of 6 45A fuses blown in the heater pack. Would a shared neutral cause problems (ie, addition of outgoing current) in the neutral wire? Most newer motors will run 208-240 just fine. Are the 2 hot wires still out 180 degrees, or is it 120? A 208V rated motor should not be run on 240V, nor should a 230V rated motor be run on 208V, motors rated 115/200-230V or 115/208-230V are fine either way, older 3Ø motors rated 220/440V will be fine on either a 208 or 240volt supply when connected for lower voltage. I'm not 100 percent familiar with the concept of 3 phase systems. I’d like to point out that you are asking 2 possible questions: Is the system you outlined, a) a 230V motor on a 240V supply? My machinery always runs the same in any of those scenarios. Share. Line Interactive Smart-UPS (SU, SUA, SMT) products with a ""T"" in the suffix of the part number are designed for a nominal 208v input. There is a small chance that the life span will be shortened just a little for a 208 volt heater run on 240 volts. Sometimes, the device identification plate indicates 208-240v as acceptable voltage intervals. They pull more amperage and give more heat at the higher voltage. Heaters were pulling 37 amps two weeks ago at startup. This means, something that is rated to run on 240 volts can run on 10%, or 24 volts in this case, more or less. I'm just having trouble with the electric boogie here.