fan limit switch settings

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  #1  
Old 02-28-05, 07:51 PM
tgodiver
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fan limit switch settings

Can someone please explain how to properly set the tabs on the fan limit switch of a Carrier heater? It is circular and has two tabs on it with numbers on the outer edges. The problem is that the fan will continue to run for about 30 minutes even though the burners cut off.

Thanks.
 
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Old 02-28-05, 07:54 PM
A
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CHeck the one with the lowest setting. Try setting it to 90-100
 
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Old 02-28-05, 08:58 PM
M
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upflow or downflow? upflow off setting 95-100 on setting 130
down flow off setting 90 on 125 A 30 degree differential is usually pretty close. Sounds like you have a Honeywell fan/limit switch L4064??
 
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Old 03-01-05, 05:36 AM
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Where's it set right now?
 
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Old 03-01-05, 10:18 AM
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Wink

The problem is that the fan will continue to run for about 30 minutes even though the burners cut off.
Is it still warm air or not? Like said how old might just need a new fan limit if thats whatyou have. Some blower controls have timers on them. you have a lot of ifs here.

ED
 
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Old 03-01-05, 11:12 AM
tgodiver
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settings

The model of the switch is T-68Z. Currently the setting on tab 1 is at 90, the setting for tab 2 is at 160.

Are the settings correct already?
 
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Old 03-01-05, 12:03 PM
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Something doesn't sound right. Is this a combination fan/limit switch or fan only. If fan only settings are not right. I am not familar wih the mod # you provided. Could it be a dual switch with only fan "off" setting and a limit setting?? The term "fan limit" has been used in other posts which could be confusing. "Fan switch"-- "Limit switch" or a combination of the two Fan/limit switch
 
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