Description
Product Summary
The Honeywell Residential AT120A1004 is a transformer from Honeywell Residential, described by the manufacturer as: 20VA transformer 120/208/240-24V with universal mounting (platefoot or Knockout). It is rated for 24V. It replaces AT120B1010.
A control transformer steps line voltage down to the low voltage, usually 24 volts, that runs the thermostat, controls and valves. Replace a transformer with no output voltage while it has correct input voltage, or one that is burnt or overheating. Find any short that blew the original first.
Before you order, match AT120A1004 to the part number on the part you are replacing or in your equipment's repair parts list, and confirm the voltage, size and connections match your equipment. If you are not sure which part your equipment needs, call us at 1.888.509.3391 with the model and serial number and we will confirm it for you.
Key Features
- Genuine Honeywell Residential part: Manufacturer part number AT120A1004, factory new.
- Voltage: 24V.
- Cross-reference: Replaces AT120B1010.
- Part type: Transformer.
Frequently Asked Questions
Is this a genuine Honeywell Residential part?
Yes. This is the Honeywell Residential AT120A1004, a factory-new transformer from Honeywell Residential.
How do I make sure it fits my equipment?
Compare AT120A1004 with the part number printed on the part you are replacing or listed in your equipment's repair parts list, and confirm the voltage and connections match. If you are not sure, call us at 1.888.509.3391 with your model and serial number and we will confirm it.
What part numbers does the AT120A1004 replace?
The Honeywell Residential AT120A1004 replaces AT120B1010.
What size transformer do I need?
Match the primary and secondary voltages and choose a VA rating equal to or higher than the original.
Should a professional install this part?
Yes. Gas, electrical, hydronic and combustion components should be installed by a qualified technician who can test the system afterward and follow the codes that apply where you live.
