Programming A Thermostat

mike glass

Hi Bill! I am trying to convert 2-wire mercury bulb to 2-wire digital using White Rodgers 1361 zone valves. I have a sample board in my shop and it seems to be functioning OK but I was wondering if the t-stat would shorten the life of the ZV motor over time? Thanks in advance!

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Dave16

Programming a Thermostat - Help

I have a new home. We have Gas forced air heat. Our thermostat is a Honeywell T8000. My problem is that when its cold we have the heat set at 70 HOLD. The heater starts, warms up, blower starts, heat runs about 2 minutes and shuts off. 3 minutes later the cycle starts over again. The heater is heating alright, but it cycles too fast. Its like the threshold temps are 69 and 71 respectively. I used to be able to adjust this with the old round thermostat with a mercury switch. What I'd like to do is set it so that if we have the thermostat set at 70, the heat will not start until it reaches 67 or 68, then warm until it reaches 72 or 73 then shut off. This way the cycle period is longer, and this is not on/off/on/off/on/off all night repeatedly. Honeywells site is USELESS as they have no real support contact. How can I set this thermostat to do what I want it to do?? Thanks all.....

Mike K

very useful

Honeywell site: http://hbctechlit.honeywell.com. There you can find the installation instructions for the thermostat, including how to set up the "cycle rate".

Floyd_2

sounds like...

someone sold you a furnace that is WAY to big for your house!!!!!
Don't blame something on the t-stat that is the fault of the yo-yo that sized the thing.
Who in their right mind would want a five or six dedgree swing in temps??
Go radiant and your t-stat will read 70 ALL the time!!!!!!
AND you'll never know if it's on or off!!!!

Dave16

Programming Thermostat

Thanks Mike, that link gave me more info than their regular site. I've had this trouble in every new home I've purchased, only before they always had the "YO YO" style thermostat, and I could make a minor adjustment. Can you elaborate on the Cycle Per Hour thing. My setting should be a 6, but what does that tell me?? The heater is only allowed to cycle 6 times per hour? Doesn't make sense to me. I can adjust the pup if I am sure what to set and to what. Thanks again for the feedback.

Dave

BillW@honeywell

T8000

Setting the cycle rate is the electronic equivalent of the old mechanical heat anticipator that you used to set on our T87's (round manual stats).Out of the box, the T8000 is set for 6 cycles per hour, which is standard for forced air heating & cooling. Cycle rates can be set for 1 (steam/radiant), 3 (baseboard hydronic or high efficiency forced air), 6 (standard forced air), 9 or 12 (electric heat). The rate can be changed by going into the "Installer Setup" mode, and following the directions. The cycle rate adjustment represents the max mnumber of on/off cycles in one hour at 50% load. For example, on a day when it's 40 degrees outside the system may cycle 3 times per hour. When it's 10 degrees below zero the system may cycle only twice an hour. In other words, as the load increases, the cycles decrease automatically, allowing the system to run at it's most efficient. These cycles depend on how well your house is insulated, what kind of windows you have, and proper sizing of your system. These electronic stats are tested to +- 1 degree accuracy. Here are some tips. Check to see that the wiring hole in the wall is plugged, and the stat is not sensing the wall cavity temperature. Make sure the stat is not in a draft, direct sunlight or over a radiator/heat register. Your system may be oversized for your house. Did the contractor who installed it do a "Heat Loss Calculation"?

Dave16

AH HA!!!!

Thank you Bill!! You gave me the tidbit of information that was missing. Quote "3 (baseboard hydronic or high efficiency forced air), 6 (standard forced air)" End Quote. Because this is a new house we have the latest technology and everything in the place is high efficiency. Our setting should have been at 3 and they left it at standard default of 6. Bingo, now we are cycling nicely. We spent an extra $1200 on insulation on the place to ensure efficiency, the thermo is in the formal dining room on an interior wall away from any vents, drafts, direct sunlight, and the line hole was caulked by the builder. Thanks again..... Dave

BillW@honeywell

Stat

You're welcome, and thank you for using Honeywell Products!

BillW@honeywell

stat/zone valve life

What ever thermostat you use has no effect on the life of a zone valve. In its simplest form, a thermostat is nothing more than a switch. Zone valves motors generally burn out for two reasons; too much or not enough voltage, or too high pressure in the line. Set your T8400 for 3 cycles per hour, and you should be fine.

mike glass

T8400

Thanks Bill! I wasn't sure whether the 1K ohm resistor between power t-stat terminal and "C" or neutral terminal would shorten the life of the warp switch

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mike glass

T8400

Thanks Bill! I wasn't sure whether the 1K ohm resistor between power t-stat terminal and "C" or neutral terminal would shorten the life of the warp switch

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