Questions tagged [thermostat]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
3 votes
2 answers
888 views

Beginner: Solder won’t flow onto thermostat tabs

I’m trying to repair my espresso maker with a new thermostat but am unable to get the solder to flow. I’m a beginner but have had some experience soldering my own guitar pedals using stripboards in ...
tylorreimer's user avatar
4 votes
2 answers
1k views

Why 2 thermostats of different rating in series in heater circuit?

I am trying to repair a small water distiller. The machine is fairly simple, heater boils water, the vapor is cooled by a fan and the water is collected. More information: How to use Connect power ...
Eng Sam's user avatar
  • 479
1 vote
1 answer
76 views

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 ...
GarlicBread's user avatar
0 votes
1 answer
117 views

Using BS270 MOSFET as Temperature Sensor

I have previously asked a question about using thermocouples to maintain a temperature range of 36-39° inside an insulated and dry environment. The more enlightened engineers advised I look into using ...
Aaron Butkovich's user avatar
2 votes
2 answers
244 views

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 ...
Aaron Butkovich's user avatar
1 vote
2 answers
82 views

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 ...
nizzlebizzle's user avatar
-2 votes
1 answer
126 views

How to design a circuit for multiple 12 V loads using one battery?

How can I connect multiple 12 V loads to this 12 V, 2600 mAh Li-ion battery without damaging it? 12 VDC cartridge heater 12 VDC fan 12 VDC thermostat
Rocky's user avatar
  • 11
2 votes
2 answers
519 views

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,...
keenkutt's user avatar
1 vote
1 answer
133 views

How to change temperature and humidity sensor of XH-M452 thermostat?

there is a thermostat for incubator for poultry. People generally using this model XH-M452. But this thermostat has a problem, in high humidity environment temperature and humidity sensor of XH m452 ...
mehmet's user avatar
  • 1,119
0 votes
3 answers
197 views

Can a rheostat (as an alternative to a relay) act as the correction unit in a thermostatically controlled electric heater?

I was studying about the various elements present in a thermostatically controlled electric heater control system. While I agree that a relay can be used to correct the output temperature from a ...
Sheraz Malik's user avatar
1 vote
2 answers
175 views

Identify the temperature sensor on a PCB

I have seven thermostats (for a fan coil central AC system) that unfortunately havd a big problem. When the relays (three big rectangles in black) are closed to turn on the fan they get quite hot. The ...
Joao Matos's user avatar
4 votes
5 answers
910 views

Electric stove place thermostat so far from heater [closed]

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 ...
M lab's user avatar
  • 1,404
1 vote
0 answers
82 views

What is this electric heater thermostat component for?

I am trying to fix an old electric heater that does not turn on. After opening the casing, I identified the part in the picture to be probably a bimetallic thermostat. When I push the part with red ...
Martin Drozdik's user avatar
1 vote
1 answer
398 views

I want to trigger buttons on a touch sensitive control panel (not a touchscreen)

I have this cheap hot tub with an electronic controller with touch-sensitive buttons (not resistive since they work with no pressure, only a light touch). The panel is plastic and the buttons are ...
libbynotzoey's user avatar
1 vote
2 answers
226 views

PT100 wiring: use different wires joined together and cable length considerations

I am trying to convert a fridge into an incubator for turtle eggs. I would like to make as little modifications to the fridge as possible (i.e: avoid drilling holes through the styrofoam) so that is ...
godorizzi's user avatar
  • 111
-1 votes
1 answer
843 views

How can I choose the values of comparator resistors?

I have a circuit that I use as a thermostat: My comparator is an LM393. I calculated the reference voltage and the R3/R4 ratio using the hysteresis calculation tool on this site: calculator So I ...
mike_lay944's user avatar
0 votes
2 answers
147 views

Identify temperature sensor in thermostat

I somehow managed to damage the temperature sensor in my thermostat while cleaning corroded battery contacts. Apparently the only fix is "buy a new thermostat", though it is a pity to ...
user1387's user avatar
  • 133
-2 votes
2 answers
300 views

Is it safe to connect Neon indicating lamps with resistors to defrost timer and other fridge components? [closed]

I want to connect some indicative LEDs neon lights pulled from the switches of a multiple ways extension cord to the fridge. Initially the defrost timer, then later all parts and wires individually so ...
USER249's user avatar
  • 661
1 vote
2 answers
242 views

Why is there a resistor in this circuit?

Why there is a 220 ohm resistor in this circuit? Can't we just connect the thermistor directly to the base of transistor?
Alex's user avatar
  • 1,508
0 votes
2 answers
148 views

I don’t know what smart thermostat to use with my high voltage [closed]

I think I have 120v but not 100% sure, I don’t know what the wires do. I live in a condo with water cooling/heating furnace. Can someone help explain what the wiring means. Because I do not have a ...
gabe 's user avatar
0 votes
1 answer
170 views

Can I get power from my Thermostat's AC relay wires?

I have a 2-wire thermostat that activates my baseboard heater when the 2 wires are shorted. I did an experiment closing those two wires with a relay and got that working well with an ESP32 as the ...
old_dd's user avatar
  • 3
23 votes
10 answers
10k views

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 ...
Justin Alexander's user avatar
1 vote
1 answer
744 views

Can a W1209 be run with 5 V DC only?

I would like to control a small heat pad using a W1209, using a power bank that provides 5 V. My circuit is working if I connect the step-up voltage controller to the power bank and increase its ...
raspiguy's user avatar
0 votes
0 answers
42 views

Modified PWM for faster transient response

My heating controller "Thermostat" uses PWM of the water valve to control the heating power to the room. It has a fixed cycle length and varies the proportion of on-time to manage the ...
tomnexus's user avatar
  • 7,764
2 votes
0 answers
242 views

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's user avatar
2 votes
0 answers
130 views

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 ...
Y. Eman's user avatar
  • 21
1 vote
1 answer
174 views

What's the Common and the NO in this diagram

I think the browns the common wire and the black is the normally open am I correct?
Sjevans's user avatar
  • 11
2 votes
2 answers
272 views

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 ...
Caleb's user avatar
  • 21
1 vote
1 answer
67 views

two independent zones from central heating unit

I have a central heating unit (a pellet stove) for a two floor house. I'd like to control it independently from two thermostats. The stove at the moment is controlled by a single thermostat input and ...
filippo's user avatar
  • 113
1 vote
1 answer
910 views

How to connect 15kΩ NTC thermistor sensor to thermostat which requires 10kΩ NTC thermistor

I have a electric floor heating in my house. Old DEVI thermostat broke down few day ago. Problem is that DEVI thermostats are expensive and a little bit dump (not smart). I want to replace thermostat ...
Sahasrar's user avatar
0 votes
2 answers
4k views

Wiring thermostat (Rittal 31100) as a 24 V temperature switch

I want to wire in a thermostat and I am having a hard time understanding the wiring diagram. I think I get that 5 is L and can be connected to your heater (3) or cooling (4). So pins 3, 4, and 5 are ...
namtrop's user avatar
  • 11
0 votes
3 answers
1k views

How does the wired Tado smart thermostat operate without a neutral connection?

I’ve been studying the wiring diagrams for the Tado smart thermostat and noticed that it only uses a live ‘common’ and a switched live to operate. Given the smart thermostat has electronics which are, ...
StrattonL's user avatar
  • 115
0 votes
1 answer
106 views

Heating element for Air Conditioner thermostat

I currently have a series of thermostats that are connected to a window air conditioner, one is used to check room temperature the other is to trick the AC to run to a lower temperature by switching ...
TAP's user avatar
  • 1
0 votes
1 answer
30 views

Advice on setting up sensor switch

Hi I would like to fit a (motion sensor/IR sensor) sensor switch to a machine in my catering van. The machine is a 12v machine. I would like to start the machine using the sensor switch and would like ...
Abcd123's user avatar
  • 41
0 votes
1 answer
83 views

Are conventional fridge thermostats active or passive?

I am talking about specifically this thermostat used in cooling systems My query to engineers & technicians is that: Can we check the working of above thermostat with only continuity tester and ...
kaka's user avatar
  • 101
0 votes
2 answers
875 views

Debugging an old Thermostat: What component is this? (3 pins SMD IC)

My Thermostat stopped working a couple of days ago and I tried to debug it. The first thing I check is if there is any component that gives a strange result with the multimeter and I found these ...
Tripola's user avatar
  • 733
0 votes
2 answers
137 views

Regulating precision heating

Whats the simplest electr(on)ic(al) method for heating a coil or similar element to a specific temperature? Generating heat is easy; dictating and regulating a specific temperature is the hard part. ...
voices's user avatar
  • 1,069
1 vote
2 answers
431 views

Need help understanding details of thermostat wiring scheme

I bought this thermostat to control air circulation, that is using it for cooling purpose. So far I managed to make it work, but I do not fully understand the wiring scheme. I would appreciate help to ...
CuriousIndeed's user avatar
0 votes
1 answer
67 views

Temperature Sensing and board heat

My goal is to have an accurate measurement of the current temperature in my room, which I will use for a thermostat. The problem I have is I bought this breakout board and soldered it to about 5cm ...
mike's user avatar
  • 111
0 votes
1 answer
135 views

Nest thermostats wiring problem 3 storey house (3rd gen, E, analogue one) [closed]

My house has 3 storeys and 3 thermostats. 2nd and 3rd floor have nest e and nest thermostats respectively. The 1st floor has an old analogue one that used to work ok. After the nest upgrade I noticed ...
Steve C's user avatar
0 votes
0 answers
271 views

Reed switch passive interupt for garage heater when door is open (using NC switch)?

I'm trying to prevent my garage heater from running while the garage door is open to prevent it from attempting to heat the entire neighborhood if/when the door is accidentally left open. I have a ...
NumericOverflow's user avatar
0 votes
2 answers
9k views

Wiring Nest Thermostat E Heatlink in place of original Thermostat

I have a Nest Thermostat E, which requires me to replace my thermostat with the Nest Heatlink. Google provides step by step instructions on how to do this using a series of questions and answers. ...
Leigh Bicknell's user avatar
0 votes
0 answers
97 views

meanwell psu inrush current and temperature sensor

I want to use a Meanwell PCB mounted power supply on my next project. https://www.meanwell.com/Upload/PDF/IRM-20/IRM-20-SPEC.PDF The spec sheet says that it has an inrush current of 20A/115VAC (I'm ...
Alex's user avatar
  • 284
0 votes
1 answer
119 views

Insert Arduino into Thermostat circuit, but no common

I thought I was all ready to replace a thermostat with an Arduino. I used a multi-meter and bridged some connections to discover the following: 1. bridging 230V (live) with Cool turns on the Aircon ...
John's user avatar
  • 15
0 votes
0 answers
121 views

4 Wire Thermostat for Two Separate Heaters

Is there any reason why I cannot use a 4 wire thermostat (Honeywell T410B, DPST) to control two separate heaters (they are fairly close to each other)? The contacts are each(?) rated for 22 A and let'...
Djames's user avatar
  • 53
0 votes
1 answer
417 views

Can I simply add a 240V Neutral to SONOFF TH10 when replacing wall thermostat

So, I have purchased a SONOFF TH10 wanting to use it to replace my wall mounted thermostat. The thermostat has 2 connections: Always-Live and Switched-Live (which is activated of course by the ...
John's user avatar
  • 1
2 votes
1 answer
1k views

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 ...
Bryan W's user avatar
  • 137
1 vote
1 answer
191 views

Thermostats outputs to GPIO then to Furnace

I have a question on how to safely connect and detect Thermostats outputs to Controller's GPIO inputs (RasPi and BeagleBone). I've been looking up a lot and most of the cases it is showing me how to ...
erik hau's user avatar
1 vote
2 answers
1k views

Relay or optocoupler to switch thermostat wires

I'm doing a project to replace my thermostat with a DIY one. I'm trying to figure out how to switch the heating/cooling/fan/humidity wires. I'm inclined to go with an optocoupler like the 4N35. It ...
Roger Far's user avatar
  • 190
1 vote
2 answers
181 views

External fan to come on when AC unit comes on.

I want to have an additional 120v fan come on when the AC unit is on. Am I able to wire that off the thermostat somehow?
Morisk's user avatar
  • 11