Question about Honeywell CT87B ROUND HEATING&COOLING MECHANICAL THERMOSTAT - WHITE Heater

1 Answer

Too hot in the garage

I have this basic round thermostate in my garage and it works fine but I want to turn it down lower than it will go. I just want to keep the space in the 40s so it doesn't freez but don't want to waste $ heating a space that is rarely used. I have the thermostate turned down to 50 as low as it will go and I also tried turning the unit a little to the right so it's out of level thinking this might fool the reading. There is also another adjustment inside the unit. A thin gold lever with a triangular hole in it. Not sure what this does. Can anyone help? Thanks

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  • tano13 Jan 29, 2009

    DMR, Thank you for the link, I'm not sure what kind of a heater it is. The system is oil fired hot water, the unit in the garage is up on the wall. Hot water passes through the pipes inside and a blower comes on when the therm calls for heat. Can I assume it's hot water heat and set it at .08 as per the manual? Also is there anything I can do to fool the system to go off at around 40 deg? Is setting out of level to the left the right direction? Thanks again for your help

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Hello, try this link to download the manual for the thermostat. The metal piece your talking about is the heat anticipator. It's used to calibrate the thermostat to the type of heater that it's connected to. Any more questions just ask. Good luck.
http://safemanuals.com/user-guide-instructions-owner-manual/HONEYWELL/CT87B-_E

Posted on Jan 21, 2009

  • David Robinson Jan 29, 2009

    Yes, if you turn the thermostat to the right you could fool the thermostat into thinking it's warmer, ie. the thermostat thinks it's 50F when it's actually 40F. When you set the temp on an old mechanical mercury style thermostat all you are doing is turning the thermocouple/bimetal coil to advance or ****** it's switch timing. That's why for proper operation you have to use a level to mount it.

    The anticipator is for controlling hysteresis and cool down in the drop out or shut down end of the cycle not to calibrate the starting temp. Make sure it stays set on the correct setting for your type of furnace.

    Other than buying a programable process control device this is a cheap fix.

    Scratch that. I'm an HVAC contractor and I just looked at one of my catalogs and Honeywell makes a thermostat that the low setpoint is 40F. There are several options. How many wires are going to your thermostat and what color are they? Let me know and I'll give you some options.

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