Nest power connectors with two zone valves


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Old 02-19-22, 08:55 AM
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Nest power connectors with two zone valves

Hi Pete,

I needed help on installing nest power connector. I have 2 zone valves. Do I need 2 nest power connector? Also, can you please by guiding on connecting the nest power connector?






 

Last edited by PJmax; 02-19-22 at 05:15 PM. Reason: labeled pics
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Old 02-19-22, 05:19 PM
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Welcome to the forums.

You will need an adapter for each nest.

I can't give you the actual wiring because everything I need is not here.
The last picture/diagram is partially how your system is wired. I can see the red and white wires.
The ones in blue and purple are there but I can't see them.

Ultimately the white wire on ZV terminal 1 should be going to W on the thermostat.
The red should be going to R on the thermostat.
 
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Old 02-19-22, 05:27 PM
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I'm going to describe one zone at a time.

Locate the two thermostat wires. One should connect to W of the zone valve. The other should connect to the place where both thermostats connect together and go to the transformer.

Connect the two thermostat wires to the dark gray W and R wires on the adapter. There is no polarity here.
Connect the light gray C wire to the C splice.
Connect the light gray W wire to terminal 1 on the zone valve.
Connect the light gray R wire to the splice point described above. R goes to both thermostats and one terminal of the transformer.
 
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Old 02-19-22, 07:50 PM
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Thank you so much Pete. You simplified it so much with the labeling,
i installed Google nest power connector to my second floor zone valve to test it out.
by using your guidance, I was able to resolve the N260 error.
However, the second floor heat is not working any more. I turned off the first floor thermostat and set the second floor thermostat to higher than room temperature. By doing that, the second floor heating did not kick in but the first floor went on again in spite of turning the first floor thermostat to lower temperature.
sending you another picture. Can you please let me know what I did wrong?
Appreciate your help again.
Thanks
 
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Old 02-19-22, 10:27 PM
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All three light gray wires don't go on the valve.
The top terminal is 1 and gets the light gray W wire.
The middle terminal is 2 and the the light gray C wire.

R is not found on the valve.
One transformer wire goes to terminal 2. That's C.
The other transformer wire goes to each thermostat only.... that is R.

 
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Old 02-20-22, 06:01 PM
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Thanks again Pete. I was able to get the second floor heating to work now based on what you asked me to do, appreciate your help even on the weekend.
I am confused on how to connect the google nest power connector on the first floor zone valve. I am attaching the current state.

Nest power connector:
dark gray W will connect to white terminal from the thermostat and the then light gray W will connect to terminal 1 on the zone valve.
dark gray red - Not sure about this one.
light gray C connects to terminal 2 of the zone valve. The terminal 2 of the zone valve already has 2 wires. Now after connecting light gray C, I will have 3wires, itís hard to fit 3 wires on a terminal of zone valve. I will have to figure out how to add the thrird one.
light Gray R should be unconnected just like you suggested on the 2nd floor zone valve.

currently there are 3 wires coming from the transformer, Black which I connected to w floor zone valve along with 2 R from 2 thermostats (see picture 1).
white connects to terminals 2 of zone valve and re connects to terminal 3 of zone valve,

Can you please help again?
picture 2 zone valve 1 where I need help.
picutre 3 zone valve 2 connected to nest power connector with your help

thanks






 
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Old 02-20-22, 07:31 PM
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Both valves are connected the same way.
C is all over the place. You don't have to attach the adapter C to the zone valve you are working on.
You could connect the C wires of both adapters together and pick one C location.
The third picture down shows a red wire from ZV1 to ZV2. It's labeled C/TT jumper.
Cut that red wire in half. Splice both red wires together. Add the C from both adapters there.

That C wire ultimately ends up on one transformer terminal.

The dark gray wires are the thermostat wires.

You should be able to tell the thermostat wires. There are two to each thermostat.
Each thermostat has one white wire that goes to its proper #1 terminal.
Each thermostat should have one red wire connected to the red of the other thermostat. That is R and goes directly to the other transformer terminals.

I rely on seeing the entire wiring package in one or two pictures. That includes the thermostat wires and the transformer. I see your zone valves with wires coming in from several directions. Your description only partially helps.

If you see the transformer..... one terminal is system C and goes to terminal #2 on the zone valves.
The other terminal is system R. Both light gray R wires connect to the R from the transformer.
The dark gray R wires are the wires that WERE connected to the transformer.

R and C is abstract. There may be an R and C label on the transformer but that doesn't mean anything. We are creating a system C and a system R from the transformer regardless of what they are labeled.
 
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Old 02-21-22, 03:44 PM
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Thanks Pete. I will give it a go and let you know how it goes,
again appreciate all your help.
 
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Old 04-06-22, 04:52 PM
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Hi Pete,

sorry I Just got to install the 2nd nest power connector. I think itís working fine now. The error message is gone away and heat is working fine on both the zones.
the only question I have is that for the both nest power connector, I have R(white color wire) on both the nest power connector unconnected. Do they go anywhere or remain open?

thanks

Nest power connector 1

Nest power connector 2
 
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Old 04-07-22, 10:02 AM
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I'm having a hard time getting my bearing there.

You have two thermostat wires. One WAS connected to terminal 1 on the valve.
The other wire WAS connected to the R source.

You disconnected them and connected both to the dark adapter wires.
The W adapter light gray wire goes to terminal 1.
The R adapter light gray wire goes to where the R thermostat wire WAS connected.

You are connecting the light gray R and W wires to where the thermostat WAS connected.
 
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Old 04-07-22, 11:12 AM
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Hi Pete,

so here is what I have.

Nest power connector 1:
dark gray W - connected to W of thermostat 1
dark gray R - connected to 3 wires (R from thermostat 1, R from thermostat 2 and R from transformer)
Light gray W - connected to terminal 1 of zone valve 1
light gray C - connected to terminal 2 of zone valve 1
light gray R - not connected anywhere

Nest power connector 2:
dark gray W - connected to W of thermostat 2
dark gray R - connected to 3 wires (R from thermostat 1, R from thermostat 2 and R from transformer) same as for nest power connector 1. Basically I have combined 2 dark gray R wires from the 2 nest power connectors and connected to the R from thermostat 1, R from thermostat 2 and R from transformer
Light gray W - connected to terminal 1 of zone valve 2
light gray C - connected to terminal 2 of zone valve 2
light gray R - not connected anywhere

zone valve 1 terminal 2 has light gray C and C from the transformer
zone valve 1 terminal 3 has 1 wire from transformer

Can you please tell me what am I doing wrong?

thanks

 
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Old 04-07-22, 12:26 PM
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Is this the right way to connect? (please the bolded and underlined items)

Nest power connector 1:

dark gray W - connected to W of thermostat 1
dark gray R - Connect to R from thermostat 1, R from thermostat 2
Light gray W - connected to terminal 1 of zone valve 1
light gray C - connected to terminal 2 of zone valve 1
light gray R - connect to R wire from Transformer and light gray from nest power connector 2

Nest power connector 2:
dark gray W - connected to W of thermostat 2
dark gray R - connect R from thermostat 1, R from thermostat 2
Light gray W - connected to terminal 1 of zone valve 2
light gray C - connected to terminal 2 of zone valve 2
light gray R - connect to R wire from Transformer and light gray from nest power connector 1
 
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Old 04-07-22, 10:34 PM
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You're making this much harder then it is.

You have two thermostat wires that come from the thermostat.
Those two wires and only those two wires go to the dark gray adapter wires. No polarity.

That leaves three light gray wires.
Light gray W goes to ZV terminal # 1
Light gray C goes to ZV terminal # 2
Light gray R goes to the R splice where the thermostat wire was connected.

If you get mixed up..... follow the # 2 ZV wire to the transformer. That is C.
The other transformer terminal is R.
 
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Old 04-08-22, 06:14 AM
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Thanks Pete.
I understand everything you mentioned except for
Light gray R goes to the R splice where the thermostat wire was connected

Are you saying the 2 light gray R wires will connect to 1 of the wire from the transformer?
There are 3 wires coming from Transformer - one is connected to terminal 2 of the zone valve, the other one is connected to terminal 3 of the transformer.
Does the 3rd wire from transformer need to be connected to the 2 light gray R wires?

Thanks!
Prashant

 
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Old 04-08-22, 06:27 PM
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The transformer cannot be connected to terminals 2 and 3.
When the zone valve opens..... terminals 2 and 3 are a dead short to activate the pump.

I thought I posted this diagram but did not. It is the basic wiring setup.

 
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Old 04-09-22, 05:08 AM
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Thanks Pete.
Is TT that you referred to in your very first diagram showing my current state a transformer?

I have it connected just like the diagram where simplified my current state.

I see that you are in Florham park. I am actually quite close to you in Morris Plains. Is it possible for you to stop by or have a phone call? If you can stop by, what kind of charges am I looking at?

thanks gain for all your help.
 
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Old 04-09-22, 01:22 PM
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I'll be in touch via PM.
 
 

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