Trying to connect electricity

Trying to connect electricity

PostBy: coalnewbie On: Tue Apr 24, 2012 4:53 am

A local Motel has closed that was totally redone about two years ago. I guess we are not boom town here. Through a connection I was given a LG 14400BTU/ Heat 13200 AC Wall PTAC Unit 265V 5KW 30AMP unit (with some front plastic damage that is repairable - I think) and I am trying to see if I can make it work for me.

http://www.manualowl.com/m/LG/LP155HED1/Manual/135789

We do not have three phase on the farm and I could I not afford (or want) to get it there, however the unit is a single phase 265V operation. The plug is a NEMA 7-30 three pronger. As the unit can supposedly operate at about 235V I am wondering if I can connect it by just a running MC armored into both sides of my main bus with of course a 7-30R. A little help here would go a long way to keep the barn help cool this summer. SUPER quiet and expensive and those Walmart window unit specials can get real noisy. There has gotta be a way (that I can afford). HELP.
coalnewbie
 
Hot Air Coal Stoker Stove: LL AnthraKing 180K, Pocono110K,KStokr 90K, DVC
Hand Fed Coal Stove: Hitzer 50-93,
Baseburners & Antiques: Invader 2 Wings Best, Glenwood #8 + Herald 116x
Coal Size/Type: Rice, Chestnut
Other Heating: Heating Oil CH, Toyotomi OM 22

Re: Trying to connect electricity

PostBy: Yanche On: Tue Apr 24, 2012 10:55 am

I took a look at the posted manual link. You will need to look at the installation manual. This will have a wiring diagram. The important thing to determine is if the refrigerant compressor is 3 phase. If it is it's useless to you. IF however it's all single phase and in intended to be powered from only one leg of the 3 phase (quite unlikely but possible) OR you can rewire it to run on a single phase THEN you could get a step-up transformer to up your existing single phase voltage to it input voltage specified.

IF the unit is a variable speed DC compressor, you might be able to buy a replacement board that is power from single phase.

All the above suggestions will require considerable knowledge and experience, access to the manufacture's technical documentation and replacement parts. I'm afraid you have a boat anchor.
Yanche
 
Stoker Coal Boiler: Alternate Heating Systems S-130
Coal Size/Type: Anthracite Pea

Re: Trying to connect electricity

PostBy: steamup On: Tue Apr 24, 2012 6:42 pm

What you have is a single phase unit. About 13,000 btuh. Not real large, enough to do a typical room. These units are designed to mount in a wall sleeve and are nothing more than glorified window units. A good quality window air conditioner will be better than a motel unit. The motel units are made for a very competetively priced market.

265 V Nominal rating is typical for a motor design to run on a 277 volt circuit. 277 volts is a single phase leg to ground of a 480 volt three phase (4 wire) system. It is used to keep circuit amperage down so wiring sizes can be smaller and thereby cheaper.

You cannot hook this directly to your panel. A nominal voltage of 240 will dip up to 10% below its nominal rating. Further more, a 240 volt system is across two phases of an electrical system. If your voltage goes to low, you will at the very least burn out the motors in the unit. You very well could short out the unit and start it on fire.

At the very least, you will need a boost transformer to up the voltage to a safe range and to isolate the unit from the electrical system. My guess is is by the time you buy a transformer of the size you need for this unit, you could purchase two good quality window units.

I would cash the unit in at the junk yard and not bother with it.
steamup
 
Stoker Coal Boiler: Axeman-Anderson AA-130, Keystoker K-6
Hand Fed Coal Boiler: HS Tarm 502 Wood/Coal/Oil
Coal Size/Type: pea, buck, rice


Re: Trying to connect electricity

PostBy: coalnewbie On: Tue Apr 24, 2012 7:26 pm

Well steam and Yanche I am not exactly thrilled by your responses but knowledge is power and today I learned something new. Luckily at this stage I have every little invested in it and now it will stay that way. Thank you both very much.
coalnewbie
 
Hot Air Coal Stoker Stove: LL AnthraKing 180K, Pocono110K,KStokr 90K, DVC
Hand Fed Coal Stove: Hitzer 50-93,
Baseburners & Antiques: Invader 2 Wings Best, Glenwood #8 + Herald 116x
Coal Size/Type: Rice, Chestnut
Other Heating: Heating Oil CH, Toyotomi OM 22