240V 3/Phase A/C Unit
- Thread starter gpatovi
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1. Without an on-site check, you can often find out the service voltage from the Power Supplier (POCO)
Beyond that, you can do an on-site check. A 240/120 3 phase delta system will have a high-leg (208 v to neutral)
2. A number of units will operate on 208/230, I would check the unit specs first,. If not, a 208 to 240 boost can normally be handled with two transformers.
Beyond that, you can do an on-site check. A 240/120 3 phase delta system will have a high-leg (208 v to neutral)
2. A number of units will operate on 208/230, I would check the unit specs first,. If not, a 208 to 240 boost can normally be handled with two transformers.
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Birken Vogt
Senior Member
- Location
- Grass Valley, Ca
Also, it seems that most A/C units are dual rated at 208 or 240 so check for sure whether anything needs done at all before spending money....
StarCat
Industrial Engineering Tech
- Location
- Moab, UT USA
- Occupation
- Imdustrial Engineering Technician - HVACR Electrical and Mechanical Systems
Modern HVACR units
Modern HVACR units
As Vogt has stated, most modern HVACR units are all rated for 208-230V usage in the USA.
Modern HVACR units
As Vogt has stated, most modern HVACR units are all rated for 208-230V usage in the USA.
masterinbama
Senior Member
- Location
- Huntsville Alabama
And many have 208 and 240 volt taps on the control transformers.
J.P.
Senior Member
- Location
- United States
I usually glance at the transformers on the pole when driving in. 3 means Y and 2 delta.
I'm sure there are exceptions to this.... But
Most homes are supplied by a single split phase of 120/240. It's cheaper to run one line for the POCO than 3 when it's not needed.
I'm sure there are exceptions to this.... But
Most homes are supplied by a single split phase of 120/240. It's cheaper to run one line for the POCO than 3 when it's not needed.
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- Occupation
- Licensed Electrician
You check the voltage
You wire it up. I can't think of last time I saw an A/C unit that was not compatible with 208V or 240V
kwired
Electron manager
- Location
- NE Nebraska
You will get burned around here if you expect all three unit transformer banks to be wye. Many of them in rural areas are full delta. If they are Wye they are likely 480/277 otherwise they are 240/120 delta. Most of them are supplying a majority of motor loads and line to neutral loads are somewhat minimal so we can still get 120 volts, but the line to line loads is nice to have a few extra volts on a motor that is designed for 230 volts in the first place.
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