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#72374 11/27/06 09:59 PM
Joined: Nov 2004
Posts: 53
H
Member
I recently went on a service call for some high bays. While up in the lift I noticed the electric unit heaters had 277V nameplates but were installed in a building with 240V. No 277V is available.

(The motors are 277V rated as well)

The customer says they are about two years old?

Any thoughts as to potential problems?


Thanks

#72375 11/27/06 10:11 PM
Joined: May 2002
Posts: 1,716
R
Member
Is there a chance that there are some Buck/Boost transformers somewhere?

We have done this before for this very situation.

Roger

#72376 11/27/06 10:19 PM
Joined: Nov 2004
Posts: 53
H
Member
No Transformer Roger,

Small building, panel in sight of heaters.
I checked to see if there was one hiding.

Thanks

#72377 11/27/06 11:02 PM
Joined: Dec 2005
Posts: 869
Likes: 4
R
Member
You won't get you maximum power output for heating.
240 volts is 86 % of 277 volts.
By V²/R you only get 75% of your heating capacity.

For the motors it depends if they have to start a heavy load or not.
If it is only to drive a fan i can't see any problems with it.


The product of rotation, excitation and flux produces electricty.
#72378 11/27/06 11:31 PM
Joined: Nov 2005
Posts: 827
Likes: 1
J
Member
I doubt that you will have any problems but it wouldn't hurt to contact the mfg. to put your mind at ease.
Joe

#72379 11/28/06 01:42 AM
Joined: Feb 2004
Posts: 1,438
Member
Only thing I can think of would be a conflict of something meant to run with a grounded phase vs. phase to phase... I'm not sure if this would be an issue in your case though...


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