Questions tagged [thermostat]
The thermostat tag has no usage guidance.
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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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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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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
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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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1answer
86 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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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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1answer
65 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
273 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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2answers
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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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2answers
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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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106 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
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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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“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
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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
102 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
148 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
179 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
109 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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237 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 ...
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1answer
141 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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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 - ...
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184 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.
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