Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [thermostat]

62 questions
23
votes
10 answers

Why do consumer ovens use thermostats instead of PID + PWM?

I measured the temp stability of my oven, and it's a really big swing of 10-15c in a saw tooth pattern. Aren't PI(D) controllers with variable output meant to dampen this type of oscillation? I imagine it would even make thermal recovery faster…
Justin Alexander
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15
votes
6 answers

What is the reason for a fuse next to a thermostat?

I'm repairing a heater that someone threw in the trash (this model): It has an internal thermostat next to the heating wires, plus a thermal fuse. What is the reason for a fuse in addition to the thermostat? It seems to me that the thermostat…
user83628
4
votes
5 answers

Electric stove place thermostat so far from heater

I buy electric stove and found that thermostat placement doesn’t make any sense. The thermostat used seem like one in iron, in that case, the iron heater connected directly to thermostat via ceramic ring. In this electric stove seem like it…
M lab
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3
votes
1 answer

What could be this particular thermometer used for?

I came across this rather strange looking thermometer. It seems to have two scales and some kind of wires inside it. There are two terminals at the top. Is it a thermostat? But it seems to be too long for one. Should be at least an arm length. It…
The_Vintage_Collector
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3
votes
2 answers

Switching a millivolt gas valve with a low-voltage digital timer

I have one of those old gas heaters that has a millivolt valve powered by a thermopile. I want to control it with the brain of a digital programmable outlet timer (minus the AC switching components - this is just the controller board) so that I can…
osmithy
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2
votes
2 answers

I need to make a makeshift thermocouple given limited resources in the third world

I'm living in a part of the world where scrap electronics are hard to come by. Recycling these are big money in the impoverished SEA region I'm living in. I have a Fluke 289 with a type K thermocouple that is reasonably precise. I really don't want…
Aaron Butkovich
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2
votes
2 answers

Powering home thermostat using standard four-wire connection

I am starting a project to build a home thermostat for my air conditioner. I have the standard four-wire thermostat cable, with labels Rc / G / W / Y where one wire (Rc) carries a 24 VAC power source, and three other wires (green, white, and…
keenkutt
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2
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0 answers

Unknown symbol in thermostat schematic - two oblique lines inside a circle

Full diagram: What does the circle with two oblique lines inside it represent? It's an Emmeti Termec thermostat
Robert Lee
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2
votes
0 answers

Will my 16 gauge wire eventually set my home on fire?

The fan relay draws 6.0A. That is a safe current for 16 gauge wire. The safety fuse is tripped at 15A which is too much 16 gauge wire. References: The below pdf link shows the Installation Instructions for my…
Y. Eman
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2
votes
2 answers

Unconventional TEC peltier use (heating)

I'm going to be breeding reptiles, so I'll need an incubator. I'm currently thinking about using tec coolers as a heater inside an insulated box. The issue I'm thinking I'll have is that with a cheap o controller with a probe like this one…
Caleb
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2
votes
1 answer

What kind of relay should be used to control a thermostat terminal?

I'm building a remote controller for my thermostat, and the only step I have remaining is the connection between the Raspberry Pi and the thermostat terminal. Essentially, the Rpi will be replacing my current Honeywell interface. What types of…
Bryan W
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2
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3 answers

heating element for miniature working oven

Please don't laugh but I am building a small working oven for my daughter and need a heating element that can heat it from 70 to 220 degrees celsius via a thermostat. I've found this heating element…
Goose
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2
votes
1 answer

Using AC relay with DC voltage

I apologise in advance if this is the wrong forum, or I'm not providing enough details. I'm building a thermostat zone controller on a raspberry pi and I've encountered an issue with the relays in my Nest thermostats - mainly that they are 240v AC…
Mal Curtis
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1
vote
1 answer

Driving 2-way synchronous motor valve with SSR

I need to control a 2-way 3-wire 230VAC synchronous motor (6W) driven HVAC valve with SSR. (This is a custom thermostat with heating-cooling valve controller). The valve internal circuitry is extremely simple with 2 SPDT switches and a camshaft, and…
GarlicBread
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1
vote
2 answers

Creating a thermostat regulated water heat bath that won't electrocute me if I touch the water

I have a basic knowledge of electronics and an even better knowledge of film photography. I'm looking to create my own heated water bath with a thermostat that will allow me to adjust the temperature of the water (Min 21c - max 38c temp) for…
nizzlebizzle
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