46-TLT40 – TRANSFORMER (120/208/240 to 24V, 40VA)

The transformer steps down your home’s line voltage to 24V, which runs the thermostat, gas valve, and control board. If your thermostat screen is blank, or nothing happens when you turn on heating or cooling, a dead transformer is a common cause. This multi-tap version works on 120V, 208V, or 240V — just connect the wire to the correct tap for your system.

Specs: 120/208/240V primary to 24V secondary, 40VA, foot mount

Replaces: 322666-701, PF40310, PF4031OEM

Fits: Universal — works with most residential and light commercial HVAC systems

In stock at Open To Public HVAC Parts in Dallas. We test parts at the counter before you buy. Call or text (214) 340-9421.

Cross-reference numbers

This part replaces the following OEM and aftermarket numbers:

• 322666-701
• 90-T40F3
• PF40310
• PF4031OEM
• TRANSFORMER

Not sure if your number matches? Call (214) 340-9421 or bring the old part in — bench-testing is free.