Question about Broan-NuTone ATTIC FAN THERMOSTAT CONTROL
Posted by Anonymous on
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Posted on Jan 02, 2017
There's probably a thermal switch in the fixture which turns the fan on when the lights are on for a period of time and heat accumulates in the fixture. It sound like the heat from the attic is setting off the thermal switch. When the attic heat drops, the fixture works correctly.
This is a catch 22 situation, because if the upper housing in the attic is insulated from the attic heat, the insulation will prevent heat dissipation from the heat generated by the fixture's light bulbs. So, for safety reasons, the upper housing should not be insulated.
I'll need to work on this to come up with a fix.
Posted on Jul 20, 2009
SOURCE: attic fans
I just fixed a Broan-353 with a similar problem - the fan was short-cycling, turning on and off within a minute or less.
These fans have a thermostat which is designed to turn off 10 degrees below where it's set to turn on. Apparently, one failure mode is this temperature delta stops working I've had this happen twice, each time after about 3 years.
Replacement thermostats are available from Broan for about $30 http://parts.broan-nutone.com/broan/Shop It's a 10 minute repair if you have easy access to the fan.
Posted on Jul 03, 2010
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