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Questions tagged [thermostat]

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19 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 ...
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1answer
51 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 ...
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0answers
30 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'...
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41 views

controlling central heating/cooling unit with relays, thermostat

I am working on a thermostat project for a heating/cooling system in the house. The original plan involved having three relays (like this one: https://wiki.wemos.cc/products:d1_mini_shields:...
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1answer
49 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 ...
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2answers
68 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?
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1answer
127 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 ...
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0answers
38 views

Compact way to fake a 24VAC relay?

I am integrating a Nest Thermostat with an open automation software, and need to make it think its W, Y and G wires are connected to something -- normally a 24VAC relay driving 120V appliances. How ...
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2answers
369 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 ...
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1answer
67 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 ...
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2answers
659 views

Can I take DC directly from W1209 Thermostat board?

I want to make an incubator. So I am using W1209 thermostat. I want to control AC and DC. I can control AC (220v AC) by the relay output. Can I control DC by connecting DC directly from the relay ...
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1answer
135 views

Replace copper capillary thermostat with digital temperature controller relay

Our lab has an old New Brunswick Model G25 incubator shaker. Its temperature control function is broken lately. We would like to replace the two copper capillary thermostats with modern digital ...
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1answer
95 views

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 ...
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3answers
163 views

“Sniffing” into a Boiler's LED panel (Central Heating)

I've built an esp8266 based web thermostat to control my heating system. Everything seems to be working fine for the moment :) What I want to accomplish is "sniff" or intercept the boiler´s status ...
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6answers
4k views

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 ...
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1answer
109 views

HVAC heating control with thermostat, on/off or continuous? [closed]

I have a honeywell rth8580wf heating thermostat. I wonder what the output of the "white" terminal is (heating control). Is it only going from 0V to 24V or is it continuous depending on the room ...
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1answer
174 views

Bimetallic Thermostat

I have a One Shot Type Thermostat CS-7TA-35 195 6103 that i've removed from a laser printer's fuser unit. There was a paper jam within the fuser unit which I assume tripped this "one shot" by metalic ...
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3answers
185 views

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 ...
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1answer
125 views

Integrating MAX31855 with FPGA to make thermostat

NOTE: I am newish to FPGA programming. I have only taken 1 university course for it. I am looking for direction on where to start, not for someone to do it for me. I bought a MAX31855 k-type ...
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3answers
266 views

Question about thermostat circuit

Can anyone clarify if I am not understanding this comparator circuit correctly. The author says that if the temperature drops across the ntc thermister, resistance will go up and cause output to go ...
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2answers
70 views

Can I permently connect the resistant of a coffee machine [closed]

I have a simple coffee machine that has a little "controller" that control the ON/OFF of the heater. Suddenly, the machine stop heating the water (and the recipient). I have open the base and test ...
3
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2answers
1k views

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 - ...
2
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1answer
145 views

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 ...
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1answer
210 views

What kind of load do US thermostat control signals drive?

This page has some really good information on heating system wiring in America. One thing I can't tell from it though, is what exactly the 24VAC call-for-heat and call-for-cool signals drive. ...