My Mueller furnace's limit switch has just bit the dust and its time for replacement due to erratic operation.
The old switch is a White Rodgers Model 535 that isn't manufactured anymore. It is a combination switch that has both fan and limit functions.
I removed it to check it out and the elements that extend over the bonnet measure 16 inches from the unit to the tip.
I have found a unit that is identical to the old unit.
I have two White Rodgers models for replacement in mind either the:
The 5A75-5 only has a 9 inch element which isn't as long as the old switches elements were.
The 5A75-12 has the same 9 inch element but has a 60 inch capillary so it gives me the extra reach I need.
This is the one I am really considering but I have one concern. Isn't the 60 inches a bit extreme? Would the extra length effect the reaction time of the switch?
The extra capillary would be coiled if I use the 5A75-12.
Here is a link for a visual between models:
The 5A75-12 is on the left while the 5A75-5 is on the right.
Thanks for the help in advance.
Last edited by Wrex; 04-14-2008 at 09:17 AM.
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