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airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8385
Experience:  Furnace, A/C and heat pump specialist.
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American standard gas furnace model GUB-75 what should the

Customer Question

American standard gas furnace model GUB-75 what should the limit switch be set at
for the fan and heat
Submitted: 1 year ago.
Category: HVAC
Expert:  airheatman replied 1 year ago.

This is going to be an older furnace,probably hard to find a manual Can you tell me the model on the limit switch? Usually we want fan on at about 130, cycle off at 95 and heat to shut down if we get over about 180

Customer: replied 1 year ago.
don't have original part had replaced last year furnace keeps going on and off too much
Customer: replied 1 year ago.
furnace is from the sixties
Customer: replied 1 year ago.
GUB-75 E-4
Customer: replied 1 year ago.
75000input 60000 bonnet 70 to 105degrees
Customer: replied 1 year ago.
Honeywell on switch
Expert:  airheatman replied 1 year ago.

Looking to see what I can find. Can you send a picture of limit?