When I moved into this house it had an old traditional thermostat controlling an oil boiler. One of the first things I did was replace it with a wireless digital thermostat/timer, as it gives more control, is easy to install (no wiring) and allows more efficient use of fuel through more precise programming and control.
When I removed the old thermostat I thought it looked interesting enough to make a video about.
When I removed the old thermostat I thought it looked interesting enough to make a video about.
Have a old one similar to this since moved in house. Never used it and its always quite. Now it is making a weird humming noise is that normal?
I would Assume this thermostat is 1970's judging by the look which is similar to the ones of that era here in the US. the ones here were rather large, had a motorized timer that you set like a lamp timer. for run cycles. and Mercury switches in lieu of open contacts.
Can you please help, my house has two of these, one for upstairs and one for downstairs, the latter does click on and off but the heating won't start, what could this be related to?
I have one that looks similar thats is actually still the control panel for our heating floor but we can't seem to get it to work? Or turn on
Do you know what model it is?
Big Clive,
Look closely at the front of the thermostat. To turn it UP you turn is ANTI clockwise. This operation is still used on the Honeywell thermostats made nowadays.
“Bellows” I think is called an aneroid ?
I had a cable running along next to the thermostat cable not connected to anything so I chopped it off I'm starting to wonder if it had a purpose now
I have never seen a thermostat that was using mains voltage. Most of them, I think, use something like 24VDC. I do have a couple of old ones around somewhere, the sort that use the bimetallic strip and a mercury switch (which makes it "hazardous waste" if I were to get caught throwing it in the trash). No idea what I'm going to do with them.
I have exactly same looking thermostat in every room,and its 2021,but mine is connected to electrics. One of them broke,and doesn't "click" anymore, when turning on/off.
What hermostat should i buy to replace this one? Thanks
Hi Clive thanks so much for explaining the workings of the stat. the penny dropped for me when you pointed out the excelerator resistor as was trying to understand my old T40 honeywell which also has a bellow type inside .. Great video!!
Maybe the resistor of hysteresis ?
We had one of these at our old house that controlled a fan in the wall that moved air between rooms.
Bellows prob contain ether.
I still have one of these for my Central Heating 😀 😀