#457 in Automotive
Reddit mentions of Aube Technologies RC840T-120 Electromechanical Relay with Built In Relay
Sentiment score: 3
Reddit mentions: 7
We found 7 Reddit mentions of Aube Technologies RC840T-120 Electromechanical Relay with Built In Relay. Here are the top ones.
or
- Direct replacement for any brand name relay
- Built-in 24 V transformer for easy installation
- Compatible with 24V thermostats with 2-wire connections (R,W) or 3-wire connections (R,W,C)
- Immediate relay activation provides improved temperature control and comfort
- Epoxy-soundproofed relay ensures quiet operation
Features:
Specs:
| Number of items | 1 |
| Release date | May 2017 |
| Weight | 0.25 Pounds |
OK. Here is what you are dealing with:
1.(L) black. Line voltage load. Either 110v or 220v. Need to verify with a voltmeter.
2.(W/Y) orange. W=heating and Y=cooling. Used for a two pipe hydronic heating/cooling system. That means water.
3.(Y/A) yellow. Y = cooling. A = electrical heater output. Heat and cool active to any relay.
4.(G1) red. Low speed fan. Through a relay.
5.(GM) blue. Medium speed fan. Through a relay.
6.(GH) brown. High speed fan. Through a relay.
7.(N) white. Line voltage neutral. Either 110v or 220v. Need to verify with a voltmeter.
What is missing is the "C" and "R" wires. Nowhere is there a low voltage 24v load and common wire. Your current thermostat does not use it.
You have two options that I know of. Purchase a transformer to supply the 24v to your new thermostat. Or return the Honeywell and purchase a wifi enabled line voltage T-stat.
Transformers. Here are two that may work:
http://www.amazon.com/gp/product/B0037MXM1C/ref=ox_sc_act_title_2?ie=UTF8&psc=1&smid=A26RBB5XP2LWJC
For 240 volts
http://www.amazon.com/Honeywell-RC840T-120-Electromechanical-Relay-Built/dp/B00D5YLY2G/ref=sr_1_1?ie=UTF8&qid=1464560168&sr=8-1&keywords=Aube+RC840T-120
For 120 volts
Line voltage T-stat:
https://casaconnect.com/en/shop/smart-thermostat-caleo/
Note: Since you have hydronic heating and cooling, in addition to HVAC, either choice for the thermostat will likely mean that you will loose that option. I have not evaluated the new Honeywell or Casa to see if they support hybrid systems.
Step 1. If it is the cheapie electric baseboard heat, you most likely have a 120v or 240v thermostat. Find out which.
Step 2. You'll need this for 240 (or if you can find one to mount in a switch box, that would be better): http://www.amazon.com/Aube-RC840T-240-Switching-Electric-Transformer/dp/B0037MXM1C/ref=pd_sim_60_1?ie=UTF8&dpID=31RasVuVDpL&dpSrc=sims&preST=_AC_UL160_SR160%2C160_&refRID=1K9Z0QT4F1AHDX7W166G
Or this for 120v: http://www.amazon.com/Honeywell-RC840T-120-Electromechanical-Relay-Built/dp/B00D5YLY2G/ref=pd_sim_60_4?ie=UTF8&dpID=41c-k5UMUgL&dpSrc=sims&preST=_AC_UL160_SR160%2C160_&refRID=1K9Z0QT4F1AHDX7W166G
Step 3. Use the above relay to hook up an Insteon Thermostat.
You can use one of these with a cheap thermostat.
I personally have a relay tied into my smart house to control my basement baseboard heat.
If it requires line voltage control, it can be adapted using a relay- transformer like this one: Aube Technologies RC840T-120 Electromechanical Relay with Built In Relay https://www.amazon.com/dp/B00D5YLY2G/ref=cm_sw_r_cp_api_i_WLZ3AbDVCCM0W
You want a relay that switches the 110v mains with a 24v signal like this:
https://www.amazon.com/dp/B00D5YLY2G/
Then you can use any of the normal smart thermostats (which switch on 24VAC).
This one (which I use) even provides the C wire (common) which the ecobee needs.
If you want to make this work with an actual thermostat, you just need a 120v heating relay. That takes the 120v heat wires, and gives you a 24v thermostat connection for a smart thermostat.
Use something like Honeywell's Aube RC840T-120 and you can connect any low-voltage thermostat to control that fan.