Nest T-Stat questions
#1
Member
Thread Starter
Nest T-Stat questions
I would like to install 2 nest T-stats to my 2 zone heat only system.I have an oil boiler with a TacoSR503 3 zone switching relay.I ran all new 6 wire to both thermostats.Is there a terminal I can hook into inside the taco unit for c wire or should I just hook up new transformers with separate plugs of each t-stat?
#2
Welcome to the forums.
There are many variations in the Taco controllers.... even among similar models.
Post a picture of yours with the cover off ... How to insert pictures.
There are many variations in the Taco controllers.... even among similar models.
Post a picture of yours with the cover off ... How to insert pictures.
#4
Member
Thread Starter
I can see a terminal with 2 connectors inside the taco unit that says 24 vac on top and com on the bottom of it'd you think I can plug the c wire into that?
#5
Takes all image files..... png and jpg are the most popular.
If it's a massive picture.... the board can't resize it.
If it's from your phone.... the default is large format pictures.
Yes.... you can use the COM side of the COM - 24V connector BUT that means the thermostat connections must be labeled R and W. If they are labeled T T ..... you need to identify the R and W.
If it's a massive picture.... the board can't resize it.
If it's from your phone.... the default is large format pictures.
Yes.... you can use the COM side of the COM - 24V connector BUT that means the thermostat connections must be labeled R and W. If they are labeled T T ..... you need to identify the R and W.
gavone
voted this post useful.
#6
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#7
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Thread Starter
so just leave everything else hooked up the way it currently is and just add the c wire from both t-stats to each of the terminals where it says 24vac and com?
#11
Member
Thread Starter
another question ,currently white wire inserted in W on t-stat,red wire inserted to Rc with a jumper to R.Nest t-stat only has R.Do I just install red wire to R now ?
#12
Member
Thread Starter
#13
R stands for 24v in.
Rh is heating functions
Rc is cooling functions.
You could have two different units..... like a boiler and an air conditioner.
Then you would need the R's to remain separate.
The jumper is used when there is only one appliance.... furnace w/split A/C.
The nest can only operate with one system.
Rh is heating functions
Rc is cooling functions.
You could have two different units..... like a boiler and an air conditioner.
Then you would need the R's to remain separate.
The jumper is used when there is only one appliance.... furnace w/split A/C.
The nest can only operate with one system.
#16
You are just running heat..... so all you need to use is W and Rh.
The Rh - Rc jumper is not needed. Won't hurt to be connected.
When you connect a C wire.... it is referenced to Rc.
That means the jumper would need to be in place.
Y, G, C, O, B are all considered cooling functions and Rc is used. (doesn't matter if no A/C)
W is heat and uses Rh.
The Rh - Rc jumper is not needed. Won't hurt to be connected.
When you connect a C wire.... it is referenced to Rc.
That means the jumper would need to be in place.
Y, G, C, O, B are all considered cooling functions and Rc is used. (doesn't matter if no A/C)
W is heat and uses Rh.
#18
It's not C and R.... it's Rc and Rh.
C = common and R = 24vac.
I'm trying to be descriptive so that you know how the system works.
C = common and R = 24vac.
I'm trying to be descriptive so that you know how the system works.
Last edited by PJmax; 12-07-22 at 03:17 PM.