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    ynotsin's Avatar
    ynotsin Posts: 1, Reputation: 1
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    #1

    May 18, 2007, 01:59 PM
    3 phase vs single phase
    Which will use less electricity: a commercial 5 ton 3 phase 13 SEER unit or a 5 ton single phase residential 20+ SEER unit? I am trying to figure out what type unit to put in our restaurant bar.
    JackT's Avatar
    JackT Posts: 260, Reputation: 19
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    #2

    May 18, 2007, 08:33 PM
    I would go with a 3 phase because of the advantages of 3 phase over single phase. Three phase won't require as large of wire size as a single phase unit to install, three phase won't have a capacitor on the compressor, and they usually start easier. There's not a real big savings on energy, you draw less amperage but it's on three wires instead of two so the actual KW usage is close. A 20 SEER over a 13 SEER will save you a little energy, but I like 3 phase.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #3

    May 18, 2007, 09:48 PM
    Three phase
    Demand meter required for business in this area. Bad news for electric bill.
    High minimum monthly usage requirements also for three phase in this area.
    Check with your elecrical utility about this before you jump. I also like 3 phase equiptment.
    JackT's Avatar
    JackT Posts: 260, Reputation: 19
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    #4

    May 19, 2007, 05:30 AM
    Good Point... check with your electric company, I was shocked when I moved South and found out there is "NO" demand meter on three phase. If you already have three phase it won't make much difference.
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