Question about Honeywell CT87B ROUND HEATING&COOLING MECHANICAL THERMOSTAT - WHITE Heater
I have a typical gas powered boiler / Heating system (radiators) and use a T87F Honeywell thermostat with 2 wires coming from the thermostat to the boiler (millivolt system). I replaced the thermostat last heating season and did not make any adjustments to the thermostat, however I had to set the temperature guage to 76 degrees to remain comfortable.
The home has a second floor and I currently have the thermostat set to 70 degrees. When the boiler cuts on, the burn time is very short, less than two minutes and sometimes less than a minute. The radiators on the second level rarely have a chance to become warm before the boiler cycles off. I checked the thermostat and the heat anticipator setting is at .4 on the scale. I'm not sure what this means or what the proper setting should be for my system.
The temperature on the thermostat says that the home is at 70 degrees but the upper rooms and the remainder of the house is not 70degrees, they are more like 64 degrees and the heat does not reach the upper floors before the boiler shuts off. Any help would be greatly appreciated. Thanks
If you start by looking on your gas valve, you should find the correct amperage to set the heat anticipator at. I am not sure if you have a forced hot water system or a steam system, but depending on the case, you may also have a second problem, which is easily addressed. If you have forced hot water, the upstairs baseboard/radiators may be airbound and need to be bleed. If you have steam, you may need to slow down the downstairs valves, and open the upstairs valves to get a balance. Hope this helps
Posted on Jul 09, 2009
I believe the T87 is a round, non programmable...right? When you installed it, did you make sure the mounting bracket was level? This is the flat plastic bracket you screwed into the wall which the thermostat attaches to. The T87 is a mercury thermostat and must be level or it gives a false reading. A "torpedo" level would work best for this as they are only about 8 inches, but you could use a larger one. Take the thermostat off and see if that is the issue. Good luck
Posted on Dec 31, 2009
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Posted on Jan 02, 2017
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