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Will fused disconnect protect my heat pump full

Will fused disconnect protect my heat pump full

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will fused disconnect protect my heat pump full

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Quick Links View Forum Leaders. Heat pump disconnect. Thread Tools. Quick question: Do I use a Non-Fusible or fusible disconnect outside next to my heat pump? Or does it matter. Thanks, Dano. View Public Profile. Find all posts by Dano Received 87 Votes on 74 Posts. Unless your instructions for the unit call for fuse protection you can use a non-fused pullout disconnect.

Find all posts by pcboss. Received 86 Votes on 76 Posts. There is a definite application for a fused disconnect, but it doesn't occur that often in residential work. Assuming you have a 50 amp circuit, if you have reently replaced your old unit with a new higher efficiency unit, the manufacturer may call for a MOCP of 35 amps or 45 amps. In these cases, you would use the fusible disconnect and fuse it to match the MOCP rating.Log In. Thank you for helping keep Eng-Tips Forums free from inappropriate posts.

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Students Click Here. Related Projects. I seem to get mixed answers on this, but when do I use a fused disconnect instead of a non fused disconnect at a unit. My understanding is a fused disconnect can act as secondary protection to the overloads.

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I have read that on HVAC units you want to use a fused disconnect. So how would I determine what size needs one and which does not. If the circuit is protected upstream by a circuit breaker or another fuse, then the general rules of the NEC would not require another fuse at a local disconnect.

For these systems, a current-limiting is required at some point in the circuit. So if the upstream device is a circuit breaker, the local disconnect will need to be fused in order to have an installation that meets UL requirements and hence, NEC requirements.

Also, a non-fused disconnect switch will generally have a lower short circuit withstand rating than a fused switch, so for systems with a high level of available fault current, the fused disconnect may be a practical necessity. Yes the feeder of this circuit will have a circuit breaker.

So for example a 50hp exhaust fan would not need a fused disconnect, just a standard disconnect? Probably not, but you need to look at the recommended installation information from the fan manufacturer. In most cases, a simple fan would not require a fuse, but if there were other things power from the same V circuit on the fan assembly e. For HVAC equipment this is most often an issue for package system such as heat pumps, chillers, air handlers, etc where a single power supply is run to the skid and there are starters, motor controls, breakers, etc provided with the HVAC system.Remember Me?

Page 1 of 3 1 2 3 Last Jump to page: Results 1 to 20 of Thread: Are fuses in disconnect necessary?? Thread Tools Show Printable Version.

Are fuses in disconnect necessary?? I've seen more often than not service disconnects without any fuses at all, simply a part that is pulled out.

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Of course down the line are circuit breakers. But why then do some have fuses and some not? What is the advantage of slow-blow fuses? Do they protect the condensing unit in someway better than just a circuit breaker? Depends on local code, and whether or not the breakers back at the panel are HACR rated. Slow-blow fuses allow for inrush current on startup. Join Date Nov Location N.

An electrician told me it would help protect the equipment better, quicker? Not sure of the reasoning, all I know is if you put in a fused disconnect, it's a guaranteed service call at some point! The manufacturer determines if fuses are needed. The word "fuse" or "fuses" will be mentioned, right on the equipment label, using a phrase like "minimum fuse size.

Including fuses. So, if fuses are mentioned, the NEC requires fuses. They do NOT have to be in the equipment disconnect. They can be the branch service fuses, in an old style fuse panel, or the fuses can be in a sub-panel near the main panel, OR, they can be in the equipment disconnect. BUT, if they are mentioned, they have to be somewhere. With most modern buildings using circuit breakers in the service panel, when fuses are mentioned on the equipment label, they are usually in the equipment disconnect.

Everyone walked away.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. It only takes a minute to sign up. I'm having trouble determining a few things about the circuit. The outdoor unit and indoor unit both have an electrical specification sticker. My confusion comes from the fact that the indoor unit plugs directly into the outdoor unit and only the outdoor unit receives power from the house.

Some of my reading makes me think that since the sticker explicitly says Max Fuse that I must use a fuse instead of a breaker. I read through the installation manual, which was surprisingly bereft of meaningful electrical information.

Regardless, the MCA is the required Minimum Circuit Ampacitymeaning your circuit needs to be sized appropriately for at least that amperage. HACR is likely to be listed on your breaker, but it's no longer required. You can do what others have suggested and use a larger ampacity circuit with an appropriately fused disconnect at the unit, but your circuit would be needlessly oversized.

To directly address your questions, the labels indicate electrical specifications for the unit, and if the instructions only show the indoor unit directly connected to the outdoor unit, then the outdoor unit should provide for any protection the indoor unit requires. The circuit only needs to supply enough current for the unit and not allow more current than the maximum rating.

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Here is a pic. Note screw fuses. The indoor unit is indeed fed from the outdoor unit.

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Fuses are definitely superior protection to breakers. The unit package should include a wiring cord that communicates between the units and provides power. The name plate sticker on the indoor unit is there for other reasons.

It is not there to tell you how to provide power to it. Use a 30A breaker to feed a fused disconnect with fuses as your manual said 25A fuseslocated next to the outdoor unit. Sign up to join this community.

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Sizing circuit for mini split heat pump Ask Question. Asked 2 years, 6 months ago. Active 9 months ago. Viewed 29k times. First question; Does the sticker on the outdoor unit take this into account? Second question; Is this true? Remember that the circuit breaker in your home panel is present to protect the wiring to the unit, not the unit itself.Remember Me?

Results 1 to 8 of 8. Thread: disconnect size for 2 ton heat pump. Thread Tools Show Printable Version. I am having a 2 ton heat pump installed which requires a maxium breaker size of 20 amps.

will fused disconnect protect my heat pump full

I am assumming that the disconnect needs to match the maximum breaker size but I can't find a 20 amp fused disconnect. Is there a problem using a 30 amp fused disconnect? Does the disconnect provide any overcurrent protection or is it's only purpose is to provide a local means to disconnect the power? There are disconnects made for the AC industry.

How to install an A. C. Disconnect

It doesn't really make sense to fuse twice. Once in the panel and once outside. Ths disconnect is there to protect the servicer and can be locked out and it is maximum current rated. Can you buy a 30 amp fused disconnect and put 20 amp fuses in it? That is what I would do. A non-fused disconnect would only provide a means to disconnect and no overcurrent protection, but you must have fuses or breakers somewere else in line, at the breaker panel, etc. Those are the MAX ratings. You can put fuses in it for any rating at or below it's max.

So, you would use a 30 amp disconnect with 20 amp fuses, and that will work fine. I'm the guy with the gun. Statements made by me are strictly my opinions and do not reflect the opinions of my employer. I am not authorized to make any official statements on behalf of my employer. Any technical advice offered by me is for educational purposes only, all HVAC related repairs should only be attempted by qualified personnel.

A disconnect is a disconnect, used to turn off power while being serviced and does not need to be fused. Join Date Jul Location N. Some local codes require a fused disconnect,its the fuse size that matters, so if you must put in the 30 amp with 20 amp fuses. Thank you everybody. I didn't understand my options before but now I do. You have answered my questions. Join Date Mar Location burlington county n.

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Heat pump disconnect

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will fused disconnect protect my heat pump full

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