Arkansas HVACR NewsMagazine November 2021

HVACR NewsMagazine November 2021

Tech News

Tech Tips – HVAC School Bryan Orr

Here is one of them:

W1, W2, & E

I got this question via email (edited slightly for length): Some things I've done because I've been taught to do them yet I don't know why I do them. One of those things is putting a jumper between w1/e and w2. Sometimes, in the case of a Goodman for example, I've been taught to combine the brown wire along all the whites at the air handler. Do you mind just clarifying the whole situation with w1/e jumped to w2? And also maybe x2 on some stats? Thanks for your help. — J Back in the early 2000s, when I was the lead trainer for another company, some of the most common miswiring issues had to do with electric heat. So much so that I created a bunch of different wiring diagrams with a fancy program called “Microsoft Paint” to illustrate how to wire different combinations of equipment.

In older thermostats (older than the diagram shown here), there were no installer setup programs where you could designate the type of system the thermostat was connected to. Each terminal performed a particular universal function, and you would configure the operation based on how you wired it up. Which terminals you connected and where, which ones you left open, and sometimes, which ones you jumpered out. So, first, let's give a quick look at the meaning of each terminal: W – When you see a W terminal, it just means heat. Usually, you will only see W when the control only has one stage of heat. W1 – Means first-stage heat. In a heat pump, first-stage heat is the same as the first-stage cool. It just means the contactor/compressor is