Is there a way to connect a 24V two-cable fresh air damper with the W200? If not, does someone have experience using a T2 relay to automate a 24V two-cable fresh air damper for an AC?
Hello, yes, you can make such automation for the T2 relay at 24 volts (constant voltage). Give the air damper power supply diagram. Here is a description of the T2 relay capabilities.
Unfortunately, I couldn’t find the brand and model for the damper; however, I can show you how the damper was wired to the Honeywell EIM. Here you have the pictures:
EIM Diagram:
Damper (2 cables):
Cables from the damper to the EIM (C and U1)
Thanks in advance for your help.
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Hello, if this connection in your photo is used for a ventilation damper, then you need to connect it as I drew. Switch the relay to dry contact mode. FOR INFORMATION. In 24 volt mode, the switch contacts S1, S2, COM DO NOT WORK. For control, you need to use a wireless button or other automation.
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Thanks for the information. I forgot to mention that the Honeywell EIM is not longer connected. How would I connect the damper (with two cables common and line) to the T2 relay if I only have access to AC thermostat cables (R (24 V), C (common), W1 (Heating 1), Y1 (Cooling 1), G (Fan))?
Please clarify, do you need to power only the ventilation fan to be powered by 24 volts?
I need to connect the Fresh Intake Damper to a 24V input.
With the Honeywell EIM, the damper opened automatically when the outside temperature and humidity reached a certain threshold.
I want to use the T2 relay with some automations to have the same functionality.
Given the way that the damper was connected to the EIM, and your wiring diagram for the T2, I think I have to connect R from the thermostat to L on the T2, C from the thermostat to N on the T2, but the question is: where do I connect the line and neutral of the damper on the T2?
Your initial task is to check if the damper (individually as an object) operates from 24 volts. If so, I will draw you a diagram of the connection to the T2 relay from 24 volts.
Unfortunately (as you can see from the picture), the damper has no information (model, etc.); therefore, I do not know for sure that it works with 24 volts. However, given that the damper was previously connected to the Honeywell EIM (which was powered with 24V), can we safely assume that the damper is also 24 V?
I will try to research more about the damper. I will keep you posted.
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Even though my damper has no brand, it seems that is this one (which works with 24V):
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Given that the damper works with 24V, can you provide the wiring diagram for the T2 relay? I plan to buy it tomorrow. Thanks in advance for your help.
Hello, what other Aqara devices are in your home? I need to know to help you. You also need a 24 volt AC transformer.
What voltage do you want to use for the relay, +/-24 volts or ~220 volts? I’m waiting for an answer.
24 V from the air handler.
24 AC voltage or DC voltage?
Based on the Honeywell EIM diagram, it is 24VAC
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Check how the damper works from this voltage (24 volt air conditioner). Make a temporary circuit and check how the damper works from this voltage.
I’ll draw a diagram later, I’m a bit busy right now.
The relay will be powered by 220 volts, the damper will be controlled via 24 volt dry contacts.
Do you have an Aqara gateway?
Don’t worry, take your time (I haven’t bought the T2 yet).
The input for the relay should be 24V AC instead of 220V.
Thanks again for your help.