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Trouble Call #195250
07/21/10 11:59 PM
07/21/10 11:59 PM
B
BigB  Offline OP
Member
Joined: Mar 2004
Posts: 721
Tucson, AZ USA
I have a trouble call coming up and not sure what to look for. The customer says he had a new air cond system installed, a split system with a variable speed indoor blower unit. Now every time the unit starts, his flatscreen TV goes nuts with buzzing and lines on the picture. It didn't happen before the new AC was installed. The TV is NOT on the same circuit as the AC. The AC people came out and checked everything and said there is nothing wrong with their installation. The new AC replaced an old one that was in the same place, on the same circuit, and didn't cause any interference on the TV.
I can't think of anything except putting each on opposite legs of the service, if not already done, or installing a filter on the TV. (The TV is built in so he has not tried other circuits using an extension cord.)

What else can I look for, or will it be a total waste of time?

Work Gear for Electricians and the Trades
Re: Trouble Call [Re: BigB] #195251
07/22/10 01:12 AM
07/22/10 01:12 AM
J
JoeTestingEngr  Offline
Member
Joined: Nov 2005
Posts: 791
Chicago, Il.
I bet the fan on the new AC has a VFD controlling it. We know how much noise they can generate. I think it would be better to place any filtering as close to the noise source as possible, especially since they will probably discover more things that it interferes with.
Joe

Re: Trouble Call [Re: JoeTestingEngr] #195252
07/22/10 02:41 AM
07/22/10 02:41 AM
G
gfretwell  Offline

Member
Joined: Jul 2004
Posts: 9,166
Estero,Fl,usa
I second Joe's opinion. You may be able to do the HVAC guy's job by getting the model info from the air handler and beating up Google a little. There may be a known problem and a fix from the manufacturer. It is probably as simple as a noise filter kit.

I am guessing they use an antenna, not cable?

If it is cable/satellite, those guys may have something too.

It could be as simple as an unterminated TV cable somewhere.


Greg Fretwell
Re: Trouble Call [Re: gfretwell] #195254
07/22/10 07:54 AM
07/22/10 07:54 AM
renosteinke  Offline
Cat Servant
Member
Joined: Jan 2005
Posts: 5,316
Blue Collar Country
And, lest we forget, GROUNDING. Make sure the AC has a good bond, from the unit all the way to the service.

Re: Trouble Call [Re: renosteinke] #195260
07/22/10 03:27 PM
07/22/10 03:27 PM
T
twh  Offline
Member
Joined: Mar 2004
Posts: 925
Regina, Sask.
Quote
It could be as simple as an unterminated TV cable somewhere.
... or a loose co-ax connection.

Re: Trouble Call [Re: twh] #195266
07/22/10 10:07 PM
07/22/10 10:07 PM
B
BigB  Offline OP
Member
Joined: Mar 2004
Posts: 721
Tucson, AZ USA
Thanks guys, turns out the guy called this morning and said he figured it out, he ran an isolated ground to the sattelite dish. I didn't think anyone was still using motorized dishes??

Re: Trouble Call [Re: BigB] #195268
07/22/10 10:27 PM
07/22/10 10:27 PM
renosteinke  Offline
Cat Servant
Member
Joined: Jan 2005
Posts: 5,316
Blue Collar Country
@$###$#!!!!

I don't believe it for a second.

What I DO believe is that he mucked something up during his DIY installation, then somehow got his errors to cancel out as be blundered about 'fixing' it.

When - not 'if' - you get called back, CYA. I wouldn't be surprised to find 10 amps running through that 'ground.'


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