Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Honeywell Thermostat help -- esp. Bill!

Jamie Hall
Jamie Hall Member Posts: 22,877
I have an application where the temperature will occasionaly go below freezing... and the low set point of the thermostat will be 40 to 45.

Question 1 for anyone... I'm thinking of using a Honeywell 8602 (I'm and HO, so I can't get the fancy one!) but it's rated ambient is only down to 32 F. Will it be actually damaged by freezing, or just be unreadable?

Question 2, also for anyone... if the 8602 can't be used (damaged by being frozen), is there a good reason why a good old T87 can't be tipped sideways (I know they're supposed to level!) so that when it says 55 it actually trips at 40?

Thanks guys...
Jamie
Br. Jamie, osb
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England

Comments

  • ed wallace
    ed wallace Member Posts: 1,613
    tstats and freezing

    why would you want it to get down that low?

    To Learn More About This Contractor, Click Here to Visit Their Ad in "Find A Contractor"
  • Glenn Harrison
    Glenn Harrison Member Posts: 405
    There is a low temp T87...

    available. Accoring to my Honeywell catalog, ther is a T87F2782 that has a range of 35º to 65º. Hope this helps

    Glenn Harrison Residential Service Tech

    Althoff Industries Inc. Mechanical and Electrical Contractors

    Crystal Lake, Illinois
  • Jamie Hall
    Jamie Hall Member Posts: 22,877
    better you shouldn't ask...

    it's complicated. But it is for part of a very large house, which part is not used as a residence (the other part is), but which needs to be kept at at least 40 F or 10 deg. F above the dew point to prevent damage to some of the collections... but the budget won't allow it to be kept at a more civilised temperature.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • Jamie Hall
    Jamie Hall Member Posts: 22,877
    perfect!

    Just what I wanted -- hopefully my local supplier (a very good shop indeed) can get it for me. Thanks!
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • BillW@honeywell
    BillW@honeywell Member Posts: 1,099
    Low temp stat

    Glenn beat me to it, and he's right. The T87 uses a mercury switch to operate, so it can't be anything but level. Exposing the T8600 to below freezing temps will damage it, so that is not a good application.
  • steve gates
    steve gates Member Posts: 329
    also

    used them for horse barns and shops any where you don't want's the temps to hi. or someone turning them up.
  • jon
    jon Member Posts: 17
    Honeywell T87F2782

    Does anyone know if the Honeywell T87F2782 thermostat that has a range of 35º to 65º is a digital one? I have gas, water baseboard heat in my garage. I do not use it but 2-3 days a year but have been told it is unprotected from thermal shock. I have been told that I should put 50% glycol mix in the system which is not an option because flow is already inadequate or put a digital thermostat (existing one is typical manual gold colored honeywell with mercury that may not be as precise as digital) that ensures that heat stays above freezing but does not heat to 40-45 degrees as it may be doing now.
This discussion has been closed.