How to size heat strips

Remember Me? Page 1 of 2 1 2 Last Jump to page: Results 1 to 13 of Thread: Heat strip sizing. Thread Tools Show Printable Version. Heat strip sizing So what size heat strips are sufficient for homes based on tonnage? Do 4 ton units really need 15kW heat strips? I have been told 10kW for a 4 ton unit is more than enough but with these record low temperatures this winter 10 degrees in SC it raises concerns.

The TRUE highest cost system is the system not installed properly I am yourmrfixit. We never install more than 10kw. You're suppose to size it to handle the full heat loss of the structure but that would be some mega wiring and heat kits for something that will rarely run. We haven't had any problems, up to 2.

Unless it's a little old lady then they get regardless When installing heat pumps this is what I follow. Example Trane heat pump 3 ton is rated down to 17 degress which is lower then out design temp but use this to size aux. Trane 3 ton heat pump 17 degrees delivers 18, Btu's so the aux heat can be sized like this for the best bang for the buck.

Design temp of 70 degress with outdoor temp of 17 is rated at 18, btu's compaired to 36, 47 degress. Total heating load equals 36, btu's again a example so 17 degress it will deliver 18, btu's. I have done this for years and speecking with Trane FSR he agrees a good practice to use as long as heat pump is sized properly and installed right. Sizing the load to match the load is important when strip only heat is used but heat pump gives me a little flexibility.

Not saying it right or wrong Just what I tried in my own home and has worked good over the years! I always sized to the homes heat loss, in case of a major heat pump failure that would take a couple days to get the part in.

how to size heat strips

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Originally Posted by beenthere.I am getting a total electric heat pump installed and the contractor is say it will take a amp breaker and that I have to upgrade my meter base to amps.

Based on the electrician 15kw would be divided by volts to give you We use instead of just to be safe One does not always get Volt on the circuit, but it is the peak. The above is true when there is zero loss. Thus Also when the heat pump is started the amp usage will spike to well above 90Amps the get things running. That is a lot of Juice.

Upgrade your panel, the contractor is correct. The contractor is right, as voltage drops the amps go up, and per the mfg specs the max breaker allowed would be 90 amps, with 4 awg wire. It's a little iffy, because even though you can do the direct amperage conversion, you have to figure the surge of the start up motor, you have to be able to handle that.

The contractor is trying to make sure the house doesn't burn down. It never hurts to go higher. It only hurts if you don't go high enough. I don't know who's right, but you need to run at least a volt line. I have to go with the Electrician, however who is going to warranty the system, find a new HVAC contractor.

Answer Save. Blue F. Favorite Answer. Conclusion: The Contractor is right. How do you think about the answers?Log in or Sign up.

Joined: Jun 13, Location: MO. Hi all, I have a question for you experts. Do you think 10k heating strips would be big enough or should I go with 20k strips?

Recommended Breaker Size for an Electric Furnace

Would the cost to operate be about the same and the 20k strips would just stay on a shorter length of time? Thanks in advance Joined: Jan 17, Location: Texas. The old rule of thumb that I have used to determine reasonableness for heating is 10 watts per square foot for heating.

If your house is poorly insulated, located in a very cold climate, has a lot of leakage, etc. Also, keep in mind that the resistance heating is only supplemental to the heat pump, not the primary source of heat unless your heat pump goes completely out.

What size wire and breaker will it take to run a 15kw heat strips?

In theory, the cost to operate will be about the same; however, the cost to install will be significantly more. I guess that I would be leaning toward installing the 10k strip.

how to size heat strips

Lone Star CharlesJun 14, Joined: Jan 14, Location: If the ducts for the heat pump are in an unconditioned attic, above the insulation rather than in a basement that will add some to the heating system sizing. Air sealing of both the ducts and the ceiling where they penetrate the attic insulation is critical in that type of installation. DanaJun 16, Thanks guys, I appreciate it.

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Your name or email address: Do you already have an account? No, create an account now. Yes, my password is: Forgot your password?If you are planning on buying a heat pump online from a wholesale HVAC dealer, or simply want to know what to expect before you have an HVAC contractor determine what size heat pump your home needs, this article will help.

HVAC professionals use an industry standard called a Manual J to size any air conditioner or heat pump. The purpose of the analysis is to determine the load calculation of your home — another way of saying the size heat pump it needs.

A professional sizing will take an hour or more to complete and is beyond the scope of this article. Having said that, there are ways to estimate fairly accurately the size heat pump you will need, including the amount of auxiliary heating you should have, in the form of electric heat strips.

how to size heat strips

The place to begin is to determine the climate of the region in which you live. By dividing the US into 3 regions, we have a cold climate that includes the northern states, the Mid-Atlantic states and the Rocky Mountain states.

The warm climate includes the southern-most states across the lower border of the country. The moderate zone is everywhere in between.

Measure length times width. If your home has more than 4 corners, plot it out on paper and break the home into sections you can easily multiply, and then add the numbers together. Before we look at numbers, remember that heat pumps are sized in terms of tons, with each ton being the equivalent of 12, Btu of heating capacity. The simplest way to size your heat pump and be quite accurate about it, is to calculate how many square feet can adequately be heated by each ton of capacity in each region.

The colder the climate, the fewer square feet can be effectively served by each ton of heat pump capacity. But keep this in mind. With that in mind, here are numbers you can use. Moderate Climate : Since homes in this region require less cooling that those in the hot region, and less heating than those in the cold region, each ton of heat pump capacity can effectively serve approximately square feet. Heat pump manufacturers also make small electric heating strips that can be installed in the heat pump split system air handler to boost heating in very cold temperatures.

They are typically offered in 5kW increments.

how to size heat strips

This chart will help you know how much supplemental heat to add. You should find the above information is pretty close to being right on the money, however!

My square feet upstairs and downstairs together is That looks like a 3. All electric. Split system.Coronavirus Update: We care about your health and continue to service our customers safely. Read More. We offer straightforward pricing so you always know you are getting a fair price. Call us for both excellent heat strip installation and heat strip repair. An electric heat strip looks like a series of coils.

Essentially, it converts the air handler into a small-scale electric furnace. Like any electronic system, a heat strip can malfunction and stop working. Because of the danger of an electric shock, you should only entrust this work to a professional. If you feel the heat you get from your air handler is insufficient, although still present, the issue may not be a malfunction, but improper sizing of the electric strips.

Or it could go the opposite way and you will receive too much heat, and will also likely trip a circuit breaker. Always make sure professionals install your electric strips to avoid these issues. Air on Demand has NATE-certified technicians on staff to help you when you have trouble with the electric heat strips in your house.

NATE certification means repair technicians with the best training possible to deliver you the heating repair in Miami, FL that will restore the comfort in your home. Twitter Link. All rights reserved. Get in Touch. Air Conditioning. Our Blog. Components of an Air Handler. How to tell you have problems with your electric heat strips An electric heat strip looks like a series of coils. Do we serve your neighborhood? Enter Your Zip Code Here. Pay Invoice.

How Your Heat Pump Uses Heat Strips

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What size of wire should you use to wire a 8 kw heat strip at volts? Wiki User Wire sizes are based on amperage. To find the amperage of a 8 kW or watt strip heater the following formula is used. A 10 copper wire with an insulation rating of 90 degrees C is rated at 30 amps.

A 8 copper wire with an insulation rating of 75 or 90 degrees C is rated at 45 amps. Calculating a 8 wire, the ampacity is 45 amps x. The load only draws 33 amps so it looks like your feeder size for the 8 kW heater will be a 8 with an insulation factor of 75 or 90 degrees C.

The length of wire needed will dictate wire size as much as amps and volts. Asked in Home Electricity What size of wire for volts and volts?

What matters is how many amps will be drawn. It all has to do with heat. Voltage alone does not produce heat. Current amps however does produce heat. The more current being used, the more heat is being produced therefore the more current the larger the wire needs to be. Need to know what the size of the wire is in the coil and the physical diameter of the coil. Asked in Heart What is the relative size of the heat? A healthy heart should be about the same size as the owner's fist.

Asked in New Electrical Work What size of wire do you need for 5 kw heat strip? A 5kw or 5, watt heat strip will use This would require a dedicated circuit using AWG 10 wire on a 30 amp breaker.Is there a "standard" method for calculating the size of the heating strip required? It's a 2 ton unit and currently has a 5Kw strip installed. My heat pump has electric heat strips for emergency and auxiliary heat. My thermostat is designed to call for strip heat if there is more than a 2 degree difference between the set point and the ambient temperature in the room.

It's clear that the efficiency of a heat pump decreases as the Heat strip not working on my goodman heat pump. We have a Heil heat pump package system in N. Last winter it developed a condition called 'dirty sock' syndrome.

We had a professional clean the unit and coat the coil with a white teflon-type paint made for this condition. The remainder of the year the unit did not smell and all summer it was Problem is, I only have 50 amps available going to old compressor without upgrading main electric box. House is sq ft with Remember Me? Find questions to answer Find today's questions Find unanswered questions. Search Topics. Login Not a member?

Installing a Heat Strip

Join our community. Oct 6,PM. What's the Con if the heat strip that is installed is inadequate? I am located in Middle Georgia if geography is a factor. Any help is greatly appreciated. Oct 7,AM. Not sure what the purpose of this heater strip is. Is this the emergency or auxiliary heat? I will copy this over at HVAC and see if those resident experts can help. There is no such thing as a standard size for strip heat.

Strip heat is used for two reasons. One is the backup heat source for a heat pump install and the other is the main source of heat for the house when no heat pump is available. The exact size of the required strip heat will depend upon what the manual J calculations call for since that is the only true way to calculate it. Any other way of calculating is guess work and that can cause major problems down the road.

If the wrong size strip heater is installed two major problems can happen. First the strip heater will have to be replaced with the proper sized one and the second problem is more severe in that the electrical circuits and circuit breakers in the house that power the heater will have to be changed usually to the next size up.

This is where the extra wire and breaker cost along with the labor can get expensive. Building inspectors look at different items in different jurisdictions but usually in the code a new home has to be able to maintain a prescribed temperature down to a prescribed outside temp. These vary also depending upon the exact area in which you live. Sorry I could not give you an exact answer but I believe in accuracy especially since it is your hard earned money being spent and the least you deserve is the comfort you are paying for.

Oct 8,AM.


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