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cisrael4031

02:18PM | 08/14/09
Member Since: 08/13/09
2 lifetime posts
Bvelectrical
Recently, I am experiencing severe interference on AM radio stations in house and garage, but only when the air conditioner is running.

When system is running, can shut down at thermostat and radio will be normal. Only AM is affected.

System is forced air 220V with outside compressor and inside exchanger and 100Amp service.

Possible cause?

LarryG

08:53AM | 08/15/09
Member Since: 07/22/04
531 lifetime posts
powering the radio off the other leg that the furnace is on for starters,

then post back with results.

is this something that always was or just started?

TimBonham

08:49PM | 08/15/09
Member Since: 01/09/07
197 lifetime posts
Since it's a 220V compressor (like most AC's), there is no _other_ leg -- it is connected to both legs of the normal 110/220V single-phase supply.

LarryG

05:40AM | 08/16/09
Member Since: 07/22/04
531 lifetime posts
the actual furnace,(not including the compressor)blower,relays,transformer,operate off 110.try plugging the radio into an outlet that is on the other leg of that stuff to eliminate that possibility.

LarryG

05:53AM | 08/16/09
Member Since: 07/22/04
531 lifetime posts
pull the compressor disconnect and fire up the air.then turn on the radio.

that would tell you if the compressor is actually generating the noise or something else in the system.like a relay,blower motor etc.

cisrael4031

05:46PM | 08/17/09
Member Since: 08/13/09
2 lifetime posts
Will attempt both suggestions tomorrow after work.

This issue began recently. Air conditioning company was out last fall for a repair. Heater on the compressor failed and kept tripping the breaker. (Their solution was to disconnect the heater) No static problems after the "repair".
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