• Honeywell Chronotherm Iii Ac Message
• Honeywell Dial Set Chronotherm Thermostat
• Honeywell Chronotherm Thermostat Old Model

I have three heat zones in my home, two upstairs and one in th basement. I recently upgraded my old mercury Honeywell thermostat upstairs to a digital type CT8775A. They are connected to Honeywel motorized valves at the boiler, type V8043E1012. When I installed the thermostats I was careful to map the wiring an everything seemed fine, the digital display came up, the room temp wa monitored and the backlight was working fine.

The Honeywell Chronotherm thermostat offers users great control over heating and cooling their home. The electronic thermostat has several programmable settings for.

1. Find great deals on eBay for vintage honeywell thermostat and old. Honeywell Tradeline T8084A 1021 Dial-Set. Vintage honeywell chronotherm thermostat.
2. Oct 04, 2010 Honeywell Chronotherm T8196A -24V Heating and Cooling Thermostat - Duration: 5:19. VICNASTY1989 4,708 views. How to Replace an Old Thermostat --.

However, now that I a starting to need the heat the problem occurs. When the room is abov the temp of the thermostat setting everything is fine and the displa works. When I raise the temp setting on the thermostat to turn th heating on, and after the furnace has fired up, the display goes blank the backlight doesn't work but the furnace continues to burn. When th furnace switches off afet a couple of minutes the display reappears only to disappear again.

I have tested the wiring connections at the boiler and behind th thermostat and they are all good. I have manually overridden the valv and tested the motor which appears to spin up OK. I don't know where t look next. Has anyone else had the same problem or can anyone sugges what the problem might be. I have three heat zones in my home, two upstairs and one in the basement. I recently upgraded my old mercury Honeywell thermostats upstairs to a digital type CT8775A.

They are connected to Honeywell motorized valves at the boiler, type V8043E1012. When I installed the thermostats I was careful to map the wiring and everything seemed fine, the digital display came up, the room temp was monitored and the backlight was working fine.

However, now that I am starting to need the heat the problem occurs. When the room is above the temp of the thermostat setting everything is fine and the display works.

When I raise the temp setting on the thermostat to turn the heating on, and after the furnace has fired up, the display goes blank, the backlight doesn't work but the furnace continues to burn. When the furnace switches off afet a couple of minutes the display reappears, only to disappear again. I have tested the wiring connections at the boiler and behind the thermostat and they are all good.

I have manually overridden the valve and tested the motor which appears to spin up OK. I don't know where to look next. Has anyone else had the same problem or can anyone suggest what the problem might be?

Thanks for the replies so far. I have checked out the following a suggested: The wiring instructions for the thermostat do not show requirement for a ground at the terminals, and it does not require battery. An identical thermostat unit installed on the bedroom zone i working correctly.

The transformer is rated at 24V so that ratin should be fine with these thermostats. I have been monitoring excatl what seems to be happening: The display is on and showing the curren room temperature. When I turn the dial to set the heat temp I want fo the room the flame symbol appears and a few moments later the furnac fires up.

After a short period of time the furnace cuts off, and afte another short period the valve closes. When the valve closes, that i when the display shuts off. Several minutes later the display come back on the valve has reopened, the room is not yet at the requeste temperature, and the furnace may fire up again. After a short perio of time again when the valve closes the display disappears again.

Thi continues until either I switch the required setting to below th current room temperature, or when the room reaches the heat setting. Tried swapping the front panel from the bedroom zone, and the same thin happens. I am trying to determine whether the fault lies with the valv which is a few years old (not sure quite how old), or whether there is fault with the thermostat before I go to the expense of replacing one o the other. Your suggestions are most welcome.

Thanks for the replies so far. I have checked out the following as suggested: The wiring instructions for the thermostat do not show a requirement for a ground at the terminals, and it does not require a battery.

An identical thermostat unit installed on the bedroom zone is working correctly. The transformer is rated at 24V so that rating should be fine with these thermostats. I have been monitoring excatly what seems to be happening: The display is on and showing the current room temperature. When I turn the dial to set the heat temp I want for the room the flame symbol appears and a few moments later the furnace fires up. After a short period of time the furnace cuts off, and after another short period the valve closes.

Honeywell Chronotherm Iii Ac Message

When the valve closes, that is when the display shuts off. Several minutes later the display comes back on the valve has reopened, the room is not yet at the requested temperature, and the furnace may fire up again. After a short period of time again when the valve closes the display disappears again. This continues until either I switch the required setting to below the current room temperature, or when the room reaches the heat setting. I tried swapping the front panel from the bedroom zone, and the same thing happens. I am trying to determine whether the fault lies with the valve which is a few years old (not sure quite how old), or whether there is a fault with the thermostat before I go to the expense of replacing one or the other. Your suggestions are most welcome.

If you remove the stat and touch the two wires together, does the valve open and circulator run? The boiler won't necessarily start as it may already be at high limit.

If things run properly by touching the wires together, and since you say you've already swapped the thermostat with another, I would be looking for a weak transformer powering the zone valve(s). There may be one or several.

Download flatout 2 full game. CoolROM.com's game information and ROM (ISO) download page for FlatOut 2 (Sony Playstation 2). Get FlatOut™ 2, Action game for PS2 console from the official PlayStation® website. Know more about FlatOut™ 2 Game. Download Flatout 2 • Playstation 2 Isos @ The Iso Zone • The Ultimate Retro Gaming Resource.

You need to find them and look for the wattage (VA) Standard heating transformers are 40 VA, but sometimes zone valves are powered by the transformer in a switching relay or aquastat relay. Click to expand.This is Turtle. I see you corrected me on the working of ground on the thermostat as a common and not a ground. Well slick the wire that I called a Ground leaves the thermostat and goes to the common side of the 24 volt transformer and then RIGHT OVER TO THE FRAME OF THE FURENACE TO A GROUND LUG.

Honeywell Dial Set Chronotherm Thermostat

So now slick what is it a Ground or a Common. Now after all this correcting of myself you did nothing for the poster but tell him a bunch of bullshit to think about. He did not want to hear all this bullshit from you but what was wrong with it to get it right and you did not answer anything for him but corrected me out of a flame war over at alt.hvac. Leave the Flame CORRECTING back at alt.hvac! This is Turtle. I see you corrected me on the working of ground on the thermostat as a common and not a ground.

Honeywell Chronotherm Thermostat Old Model

Well slick the wire that I called a Ground leaves the thermostat and goes to the common side of the 24 volt transformer and then RIGHT OVER TO THE FRAME OF THE FURENACE TO A GROUND LUG. So now slick what is it a Ground or a Common. Now after all this correcting of myself you did nothing for the poster but tell him a bunch of bullshit to think about. He did not want to hear all this bullshit from you but what was wrong with it to get it right and you did not answer anything for him but corrected me out of a flame war over at alt.hvac. Leave the Flame CORRECTING back at alt.hvac!