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where do I hook my c-wire from the google power connector to TACO SR501-4

genecook
Community Member

I have two next thermostats I'm looking to connect & each thermostat only has a white & red wire.

I've gone to the zone controller & connected a Google Power Connector to the white, red, and what I believe is where the C connector goes (see pic). I'm still getting low power & wifi disconnects. All software has been updated on the nests.

HELP!

 

TACO SR501.jpg

10 REPLIES 10

CoolingWizard
Silver Product Expert
Silver Product Expert

My concern is that system looks like a high voltage system and we need to verify that you have a low-voltage transformer installed. Using a volt ohm meter, set the meter to AC voltage, put one lead to the number number 6 N/C and the second lead to the #5 COM and see if you have approximately 24V AC and not over 29V AC. 

Ken, The AC Cooling Wizard 

NestPro and HVAC company owner

Ok, I'll try that... there are 3 terminals marked COM. One up top next to R & W, #3 on bottom left, and #5 (your suggestion). Are the other two dead?

@CoolingWizard The TACO box runs into this other box before it goes off to the thermostats.

Should the Google Power Connector attach to this?

 

top box.jpg

CoolingWizard
Silver Product Expert
Silver Product Expert

I see in this picture T, T and X,?  I am curious if there is low voltage between T and X. The goal is to find ~24V AC. 

Ken, AC Cooling Wizard

NestPro and HVAC company owner

@CoolingWizard I should be able to figure that out if I put one lead to the number number 6 N/C and the second lead to the #5 COM? Here is a pic of the setup on the pole. setup controllers 2.jpg

EdwardT
Community Specialist
Community Specialist

Hi folks,

@CoolingWizard, thanks for the help!

@genecook, how's it going? Were you able to test if you're getting 24V between T and X? Let us know if you still need assistance and we'd be happy to assist.

Thanks,

Edward

EdwardT
Community Specialist
Community Specialist

Hi genecook,

It's me again. I wanted to check back in to see if you have other questions and concerns. Feel free to let me know if you do.

Thanks,

Edward

EdwardT
Community Specialist
Community Specialist

Hi genecook,

I'm just checking in to make sure that you've seen our response. Please let us know if you have any other questions or concerns as I will be locking this in 24 hours.

Thanks,

Edward

CoolingWizard
Silver Product Expert
Silver Product Expert

I’m sorry I’ve been so busy I was not able to reply, I hope you have a volt ohm meter I believe the connectors on the right hand side are low-voltage, and the ones on the left a quarter line voltage stay away from that side. Now let’s talk about what about N/O and N/C. N/O stands for normally open, and N/C means normally closed. Now you’re wanting to connect to normally open because what you wanna do is cause that circuit to close to initiate an action. I don’t know the device you’re hooking up to that well I’ve not come across them, so I don’t know if it responds to the thermostat or it drives the thermostat.

with a voltmeter, you could check between N/C, and common and see if there’s any measured AC voltage. I am hoping it gives you something around 24 V AC and not 120 V AC..

Ken, The AC Cooling Wizard

NestPro and HVAC company owner

Hey folks,

Thanks for following up, Edward.

I appreciate your assistance here, Ken.


It looks like we haven't heard back from the OP, so I'm going to lock the thread in 24 hours.

Best,

Mark