Question Regarding Honeywell Chronotherm III

[Ronald Cliborn]

I bought a home with two of the above mentioned thermostats. Either I can't figure out how to program them, or they don't work correct.

I changed the batteries to eliminate that possibility.

The Problem: The thermostat doesn't come on or go off when I want it to, or provide the desired temp I program in.

It seems easy to operate and program, but the problem lies in the grouping of the "On" & "Off" buttons. There are:

1.) Wake 2.) Sleep 3.) Leave 4.) Return

I believe WAKE turns the system ON at the start of a Day. But I don't know if it then gets turned off by SLEEP or LEAVE.

The same with RETURN. Is it turned off by SLEEP.

WAKE --> LEAVE --> RETURN --> SLEEP is what I've tried without success. I'll try the other combination, but if someone KNOWs could you please help me out??

Thanks Ron Cli Bon

[Bob]

The automatic program never actually turns the system on or off. You can do the equivalent turning it off for a period (wake, leave, return, sleep) by setting the heat temperature for a low value. For example:

Wake: 68 Leave: 50 Return: 68 Sleep: 55

Unless you have a lot of heat loss it's not likely the system will run during the Leave period.

Many of these thermostats gradually adjust the temperature, so if you have the wake time set for 6:00, it may start heating at 5:00 with short cycles so the house is comfortably warm by 6.

[CBHVAC]

All you are doing when you program the times, and temps, are just that...times and temps. IF you set the thermostat to be at 80F at WAKE time of 6am, and its 74F at 5:59, it will turn it on at 6 to heat the area. IF, and this is IF you have the Adaptive Recovery feature ON, it might even start the unit in WAKE mode at 5:50....depending on the previous weeks measured time to raise the temps as needed.

[Colbyt]

This unit has a built in program the goal of which it to have the area at the desired tempature by the stated time. It uses readings over a period of days. Example to have the house at 70 degrees by 6 AM it may caculate that it needs to start the heating process at 5 AM or earlier. These times can and will vary based on the the last X days of info the chip has stored.

For me in my area where the weather changes quickly this did not work. This feature of the thermostat can be easily disabled by (I am going to have to look this up and post again). I think it was just a quarter turn of a screw on the back of the unit. Post again or email me.

When this feature is disabled the thermostat will not call for heat or cool until the time you have selected. This means that the home may not be at 70 degrees at 6 AM but the furnace will be running and trying to achieve that tempature. For us this worked the best.

Colbyt

[mm]

I don't know this particular thermostat, but it seems to me, it depends on what times you enter. If you put in 7AM for wake,

and a) 8AM for Leave, it will next head for the leave temperature.

If you b) put in 5PM for leave, and 9AM for Sleep, it wiill next go to the sleep temperature.

Maybe you get up at 7, check your files, read the paper, and go back to sleep at 9.

Then you wake up at 4 again, leave at 5 and Return at 2AM/

Since you only have 4 settings, you won't be able to have it turn down automatically at 3AM, but them's the breaks. No, that's not right, you can put set the Leave for 3AM, since you've done nothing to make the temperature to go up in the afternoon.

Although you might want three cycles with a schedule like this, and this thermostat only has two. So you'd probably skip the shortest one, or maybe the day cycle since maybe the sun keeps it warm during the day anyhow.

What do you call success and how do you know you didn't have it?

Remove NOPSAM to email me. Please let me know if you have posted also.

[trader4]

The sequence should be: wake leave return sleep. Pick the time/temp you want for each of those and the thermostat should switch to the new temp at the appropriate time. If you change it to a diff temp manually, then it should go back to the programmed temp at the next time that is set in the program, unless you have it on hold. On hold it will just maintain the current set temp indefinitely.

[Travis Jordan]

Each program (Wake, Leave, Return, Sleep) operates sequentially, in the order you listed.

Here's the complete documentation on that product (T8602C). The user programming instructions start on page 26.