Internet #202264717

Model # AT72D

Store SKU #977267

0085267990103

Honeywell

24-Volt Transformer

  • Step down transformer
  • Knockout mount
  • For use in 24 Vac control systems
$ 32 99
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Frequently Bought Together

Frequently Bought Together

Product Overview

  • Step down transformer
  • Knockout mount
  • For use in 24 Vac control systems
This Honeywell NEMA Standard Transformer is a multi-mounting. 24-Volt control circuit step-down transformer designed to power any 24-Volt control system, including thermostats, gas valves and relays. 1 year limited warranty.
  • Override protection provided
  • Color-coded 9 in. lead wires for primary connections
  • Energy limiting, meets NEMA standard DC20-1992
  • Transformer is marked NEMA type D, meets NEC class 2 not wet, class 3 web UL 1585 requirements
  • -20 degrees Fahrenheit to 105 degrees Fahrenheit temperature rating
  • Connections 2 screw terminals can be foot mounted, plate mounted or clamp mounted
  • Voltage: 120 (50/60 Hz)
  • Click here for more information on Electronic Recycling Programs

Product Overview

  • Step down transformer
  • Knockout mount
  • For use in 24 Vac control systems
Model #: AT72D
Sku #: 977267
Internet #: 202264717

This Honeywell NEMA Standard Transformer is a multi-mounting. 24-Volt control circuit step-down transformer designed to power any 24-Volt control system, including thermostats, gas valves and relays. 1 year limited warranty.

  • Override protection provided
  • Color-coded 9 in. lead wires for primary connections
  • Energy limiting, meets NEMA standard DC20-1992
  • Transformer is marked NEMA type D, meets NEC class 2 not wet, class 3 web UL 1585 requirements
  • -20 degrees Fahrenheit to 105 degrees Fahrenheit temperature rating
  • Connections 2 screw terminals can be foot mounted, plate mounted or clamp mounted
  • Voltage: 120 (50/60 Hz)
  • Click here for more information on Electronic Recycling Programs

Specifications

Dimensions

Product Depth (in.)
2.5
Product Height (in.)
3.25
Product Width (in.)
2.25

Details

Brand/Model Compatibility
Works with all applicable brands
HVAC application
All HVAC types
Product Weight (lb.)
2lb
Returnable
90-Day

Warranty / Certifications

Manufacturer Warranty
1 year limited warranty

Specifications

Dimensions

Product Depth (in.)
2.5
Product Height (in.)
3.25
Product Width (in.)
2.25

Details

Brand/Model Compatibility
Works with all applicable brands
HVAC application
All HVAC types
Product Weight (lb.)
2lb
Returnable
90-Day

Warranty / Certifications

Manufacturer Warranty
1 year limited warranty

Questions & Answers

24 volt ac or dc?

Asked by: smedley
This transformer is AC
Answered by: Charlie
Date published: 2018-06-04

Can I use this transformer to my 24 volts lawnmower I like to convert to 110 electronic

Asked by: Abdul
Your lawn mower probably has a big sticker on it that says something like 10 amps, or maybe more. It may be on the battery - something like "20 amp hour." Just to put things into perspective, this transformer can only deliver about 1.5 amps. If you connected it to the lawnmower, it would heat up, and it's internal overload protection would shut if off, if your fortunate. It could start a fire, electrocute you, and damage the lawn mower. You also have another problem, this device puts out AC power, not DC, and your lawn mower needs DC.
Answered by: Philip
Date published: 2018-12-15

Can I use this to switch from a line voltage thermostat to a smart thermostat? Do I need an isola...

Can I use this to switch from a line voltage thermostat to a smart thermostat? Do I need an isolation relay as well, or can an Ecobee connect to the transformer directly?
Asked by: CAA
Yes smart thermostat use the same power
Answered by: Jp
Date published: 2019-05-05

Is it in store?

Asked by: Dado
It was in my local HD. But it’s not in the usual doorbell section. I found it in the HVAC section since it is also commonly used to power newer Smart thermostats
Answered by: PaulN
Date published: 2018-12-15
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Customer Reviews

24-Volt Transformer is rated 3.8 out of 5 by 32.
Rated 5 out of 5 by from The operation of our boiler zone valves was intermittent in the spring. One day they did not move... The operation of our boiler zone valves was intermittent in the spring. One day they did not move at all. The zone valves moved OK manually. I finally traced the problem down to a weak 24-Volt transformer. I purchased this Honeywell 24-Volt transformer at Home Depot. They had it readily available at my local store. It was an easy install: Shut off the circuit breaker that powers the boiler. Remove the main safety switch box cover on the boiler. Remove the old transformer. Install the new transformer thru an electrical knockout. The wires were long enough to attach to the electrical feeds to the furnace. Attach the 24-Volt wires on the outside terminals of the transformer. They are safe being not covered. Close everything up and then turn on the breaker. Our boiler zone valves were operating as they should. This problem was fixed with the help of Home Depot.
Date published: 2019-06-12
Rated 5 out of 5 by from I got this transformer for my new Ring camera doorbells which require more juice and it did the t... I got this transformer for my new Ring camera doorbells which require more juice and it did the trick. The Ring Pro requires a higher voltage transformer and the common 16V (or less) transformers aren’t enough power. As soon as I installed this 24V Honeywell, everything worked like a charm! I have a two family home and 4 doorbells running off of it. Two of them are basic backlit-button doorbells and the other two are both by Ring: Pro and Ring2 (both 1080p). All are hardwired to this single transformer and work well. Most HD stores should carry this 24V model, but it’s not in the usual doorbell section. I found it in the HVAC section since it is also commonly used to power newer Smart thermostats. Took me a few minutes to install it myself. Installed super easy after I found it in the basement. They can be difficult to locate in your home, but usually found by the circuit breaker, in the attic or hiding elsewhere. Had mine for about six months now. Hope this helps.
Date published: 2018-08-17
Rated 5 out of 5 by from Did exactly what I needed for providing power to 2 doorbell chimes. Nothing really special about... Did exactly what I needed for providing power to 2 doorbell chimes. Nothing really special about it. It just works.
Date published: 2019-05-14
Rated 1 out of 5 by from 1 Star Review Rating provided by a verified purchaser
Date published: 2019-06-28
Rated 5 out of 5 by from Works fine I used this to provide power to my Sensi thermostat. My old (50's) floor furnace does not provide power out, so I needed a 24VAC source. This worked great and was easy to install. You can mount it on the cover of a 4" box, with most of the unit outside the box. The portion of the transformer on the inside of the box is the 120V side, so those wires are protected.
Date published: 2016-07-19
Rated 4 out of 5 by from Transformer was easy to install and is now providing power... Transformer was easy to install and is now providing power to my wifi thermostat. Includes junction box cover plate that also mounts the transformer.
Date published: 2019-03-05
Rated 5 out of 5 by from Easy to install. Does what it should. Powers my Ecobee.... Easy to install. Does what it should. Powers my Ecobee.
Date published: 2019-04-16
Rated 4 out of 5 by from 4 Star Review Rating provided by a verified purchaser
Date published: 2019-03-13
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