What are Wet & Dry Contacts
If you've been wondering what wet and dry contacts are, you're in luck. In this video, we demonstrate how to identify wet vs. dry contacts using the Danfoss ERC 213.
Dry contacts (terminals 1 and 2 on DO1) don't have an automatic input and don't take power intrinsic to the control; you have to connect them to a power supply and feed them to a device.
Wet contacts (terminals 5 and 6 on DO2 and DO3) directly feed on power from the control and rely on voltage from the controller. In the case of a typical thermostat, your typical load terminals (Y, O, W, and G) would all be considered "wet" contacts.
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Пікірлер: 27
Thank you for the informative lesson once again.
You taught me something I was looking to know and something I had down-the-line to learn. Thank you
A wet contact uses the power supply of the board itself to power components. Dry Contact is just passing through from an external power source
wow I got alot I need to learn thanks for the upload!!
You just blew my mind! Thank you
Thank you!! I undertand most of the explanation, even though I don´t speak English. Thank You HVAC School!
Thank you for the email and the link too the video. Great video thank you
Very good explanation........= )
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Thank you soo much helped alot
@derekevans7780
4 жыл бұрын
A lot is two words man, not one!
Thank you very much
Clear as mud
@HVACS
5 жыл бұрын
I guess this one isn’t for you
@tgd02
3 жыл бұрын
make your own video then jackass
thank you!
Thank you, the Wet Contact is clear, but you missed to explain what is the use of this DO1 (dry contact), what does it do sitting there? It probably feeds the coil of relay which in turn does the WET contact job.
@Ladiesman7790
8 ай бұрын
Simply... DO1 is dry contact and DO2, DO3 are wet contact ?
The explanation would be dramatically better if your diagram wasn't missing 3/4s of all the wires. This is a simplified diagram that people would need to be familiar with regarding the standards, definitions etc. Put together a diagram that has all the wires in it so everyone can understand it.
What’s DO1, DO2, DO3 mean ?
Dry Contacts: 1. 1-2 are dry contacts. 2. There is no automatic input for 1 and 2. Its not taking what you're feeding the control with. You either feed 1 or 2 by applying voltage. anything else?
It's rather simple. Let's consider outputs. Dry DO (digital output): a switch controlled by some circuit, (like a relay). Wet DO: it's actually Vout controlled by a circuit. i.e. wet DO is a signal, (like the DTR of the RS232).
So in one case (dry) you have to hook up power from an external power source directly to the relay. In the other case you have to hook power from an external power source to a control board (wet) which in turn hooks up power to the relay........... So in other words it is the same damn thing but one has basically a control board and one does not. What a useless term.
dry contacts, did not give a good example, wet contacts clear explanation
@HVACS
4 жыл бұрын
Thanks for the feedback
@user-ot3zk5me5l
4 жыл бұрын
3:30 is a perfect example
made too complicated ... didnt understand ...