how much current can the nest handle?

[iowagold]

how much current can the nest handle?

and is there a way to not have the fan in cooling mode?

exotic system at my place.

i have window air con units and have made a 24 vac relay control panel to start and stop the air window units.

this way i can use a standard thermostat to control the air units.

the issue is now with the new nest unit it will not let me select cool only with out the fan control. and i am getting relay chatter as the control ckt in the next is too low of current to switch in the 2 relays.

this system works ok when i use a digital round.

i was looking forward to the ipad control for summer cooling..

so far it is a bust.

[Ryan_G]

Hi iowagold,

Thanks for reaching out and we're sorry for the delay.

The Nest thermostat is compatible with most 24V systems and we don't have a specific current measurement. 

The fan settings can be managed if you have a dedicated G wire connected to your thermostat. Check out this link for more information on how to control your fan with your Nest thermostat.

Best regards,

Ryan

[Ryan_G]

Hey iowagold,

I just wanted to follow up and see if you're still in need of help. Please let us know as we would be happy to answer any questions you may have. 

Best regards,

Ryan

[Ryan_G]

Hey there,

Thanks for being here in the Google Nest Community. 

I'd like to bump in here and 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 thread in 24 hours.

Have a great day.

Best regards,

Ryan

[iowagold]

it will not let me turn off the fan when in air con mode.

also i need to know the exact current this switching will stand in amps.

the hvac relays chatter in air con mode.

is the nest switching relay or electronic relay.

[Ryan_G]

Hi iowagold,

Thanks for sharing your thoughts here in the community.

We don't have any information to share about the exact current that the Nest thermostat can handle but you can check out this link for more information on how to control your fan using your Nest thermostat.

I hope it helps.

Regards,

Ryan

[iowagold]

yea but there is not a soft switch in the setup to turn off the fan during cooling mode.

these days with all the new air con units like mini splits, and base board convection heating with 24 volt control. and hydronic.

we need to be able to have the fan to turn off or run separate from the call for cool like it does for the call for heat. 

[iowagold]

well a "C" wire transformer did the trick!

click here for the long wire C wire transformer on amazon for 18.00 shipped 

soldered on to the R wire and connected the other transformer wire to the C

i did see a mention you have to use the C wire transformer to get 200 ma worth of switching..

the way it sits with the onboard battery it is only maybe 30ma and is too low to fire real relays to a good solid latch state.

so now we are down to the fan control in cooling mode...

we need an soft switch to turn off the fan during cooling for exotic cooling systems.

and make it still where we can maybe run the fan only first to help with the air flow before kicking in the compressor.

make this as an advanced feature pack like a different software flash?

or just place it in a pro settings screen for the advanced HVAC guys out there.

[Ryan_G]

Hey iowagold,

Thanks for being here in the Google Nest Community.

I'd like to check on how your Nest Thermostat is doing. You could check out this link for more information on how to manage fan settings with your thermostat.

Best regards,

Ryan

[Jake]

Hey iowagold,

I wanted to check in and see if you managed to see Ryan's post. Was the article posted able to help? Please let me know if you have any questions from here. I would be happy to assist, and ensure you are good to go.

Best regards,
Jake

[Jake]

Hey iowagold,

I want to ensure you are good to go, and everything is working properly. Please let me know if you are still having trouble, as I will be locking the thread in 24 hours due to inactivity.

Best regards,
Jake

[Jake]

Hey iowagold,

I am sorry for the trouble you are having. I know this is not an ideal situation. Do you mind me asking if the article shared by Ryan was of any help? Please let me know, as I would be happy to review further, and see if I can find more details.

Best regards,

Jake

[iowagold]

no it did not help.

[iowagold]

still cannot turn the furnace fan off when in the cool mode.

this is costing me BIG bucks to run the furnace fan!

we need a software update to add a soft switch for using the thermostat with a stand alone air conditioner.

not a happy camper when i got the $500 dollar bill for last months electric!

get this fixed asap!