AC circuit Breaker Size
- Thread starter tadziu
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Re: AC circuit Breaker Size
I would suggest that the OCPD rating would be specified by the A/C manufacturer for protection. It is of my opinion that unless specified by the A/C manufacturer you can not conclude that a breaker of any size would protect an A/C unit.
Otherwise one would size the cable to carry the A/C load and size the breaker to protect the cable.
I would suggest that the OCPD rating would be specified by the A/C manufacturer for protection. It is of my opinion that unless specified by the A/C manufacturer you can not conclude that a breaker of any size would protect an A/C unit.
Otherwise one would size the cable to carry the A/C load and size the breaker to protect the cable.
Re: AC circuit Breaker Size
If you know the manufacturer of the equipment I can give you Maximum Overcurrent Protection rating and Minimum Circuit Ampacity Rating.
We have Mechanical Engineers in our office that can help determine this if given the Tons and Manufacturer of Equipment.
If you know the manufacturer of the equipment I can give you Maximum Overcurrent Protection rating and Minimum Circuit Ampacity Rating.
We have Mechanical Engineers in our office that can help determine this if given the Tons and Manufacturer of Equipment.
A
a.wayne3@verizon.net
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Re: AC circuit Breaker Size
You would have to know manufacturer,model # etc.The Max breaker size is determined by the manufacturers specs.I have seen the same tonage,seer rating and have had different breaker sizes listed.No easy out on this one
You would have to know manufacturer,model # etc.The Max breaker size is determined by the manufacturers specs.I have seen the same tonage,seer rating and have had different breaker sizes listed.No easy out on this one
luke warmwater
Senior Member
Re: AC circuit Breaker Size
I hate sending out a request for A/C info, only to get a fax or phone call that says '5-ton'.
And that's after a written request for F.L.A. and min/max breaker size.
Allen, how true.
I hate sending out a request for A/C info, only to get a fax or phone call that says '5-ton'.
And that's after a written request for F.L.A. and min/max breaker size.
A
a.wayne3@verizon.net
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Re: AC circuit Breaker Size
Luke I also have had the same thing happen,What gets me is some manufacturers,have some models that go just over what I was always used to.Look at a 5 kw single phase heat strip,by all rights it should be wired in 10/2 nm (residential unit).But some companys now use a larger blower motor that takes it to 32 amps,We have been bitten all to many times by this and now wire all electric A/H/U`s with 6/2 nm.All said after initiating this change we are no longer at risk.
That`s an A/H/U a compressor uses min/max listing and without that there is no possible way to know what to install
Luke I also have had the same thing happen,What gets me is some manufacturers,have some models that go just over what I was always used to.Look at a 5 kw single phase heat strip,by all rights it should be wired in 10/2 nm (residential unit).But some companys now use a larger blower motor that takes it to 32 amps,We have been bitten all to many times by this and now wire all electric A/H/U`s with 6/2 nm.All said after initiating this change we are no longer at risk.
That`s an A/H/U a compressor uses min/max listing and without that there is no possible way to know what to install
Re: AC circuit Breaker Size
Thank,s for the help Guy's.It looks' like the only way to fuse an AC system is to have the MFG.'s specs. But I did make a futile attempt to go out to the Web and I found a conversion table which converts Tons to watts. 1 Ton (refridgeration)= 3517.2 watts. However when I used it to calculate amps. My answer seemed to be too high. Website is (http://www.simetric.co.uk/si tz.htm)
Thank,s for the help Guy's.It looks' like the only way to fuse an AC system is to have the MFG.'s specs. But I did make a futile attempt to go out to the Web and I found a conversion table which converts Tons to watts. 1 Ton (refridgeration)= 3517.2 watts. However when I used it to calculate amps. My answer seemed to be too high. Website is (http://www.simetric.co.uk/si tz.htm)
wanderer20001us
Senior Member
Re: AC circuit Breaker Size
Tadziu -
The conversion of 1 ton = 3.517kW cannot be used to calculate input power to a A/C unit.
FYI - The term ton comes from 2000 lbs of ice. It takes 3.517kW for an hour(or ~12,000Btu-hr) to melt 1 ton of ice.
Tadziu -
The conversion of 1 ton = 3.517kW cannot be used to calculate input power to a A/C unit.
FYI - The term ton comes from 2000 lbs of ice. It takes 3.517kW for an hour(or ~12,000Btu-hr) to melt 1 ton of ice.
Re: AC circuit Breaker Size
Wanderer200001us
1 ton of ice will absorb 12000 btu of heat per hour for 24 hours before it is melted (288000 btu). This is from and at 32 degrees F. The ice temp will be 32 at beginning and the water temp will be 32 at end. 1 ton of Refridgeration is calculated by this "Latent Heat" transfer.
steve
Wanderer200001us
1 ton of ice will absorb 12000 btu of heat per hour for 24 hours before it is melted (288000 btu). This is from and at 32 degrees F. The ice temp will be 32 at beginning and the water temp will be 32 at end. 1 ton of Refridgeration is calculated by this "Latent Heat" transfer.
steve
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