B6E or V Series Troubleshooting

Common pitfalls and how to avoid them for B6E- or V-Series air handlers

As efficiency regulations change, the demand for greater efficiency units is ever-increasing. Because of this, technicians will often come across air handlers containing an ECM motor. For Nortek Global HVAC equipment, this will be a B6E or V-Series air handler.

Oftentimes, when contractors are troubleshooting or installing these air handlers, they will struggle to set airflow correct. It can be tricky to reset the dipswitches because once the motor control board registers a setting once, it wants to hold on to those settings. Luckily, there is a fairly simple way to reset the motor control board inside the air handler.

Here is the straightforward process.

1. Look for the eight dipswitches.
2. Turn the main power source of the air handler off.
3. Turn all of the dipswitches to the OFF position.
4. Turn the main power source back on and let it run for at least 60 seconds.
5. Turn the main power source back off.
6. Look at your blower chart and set the dipswitches to the position that you want them.
7. Turn the power back on.

That is only the first pitfall. The next mistake that technicians will make is connecting the Y on their thermostat to the Y1 of the air handler. Y1 is only used when two-stage outdoor equipment has been installed. What you really need to do is go from Y to Y/Y2 to get maximum airflow. This is particularly important if you are dealing with a single-stage system. Technicians will also want to make sure that they have a G circuit between the thermostat and the air handler.

If you’re looking for additional B6 air handler motor testing help, check out the benefits of the Broad Ocean Motor Tester. This tool is reliable and reasonably priced. Plus, it is easy to use and can take much of the guesswork out of troubleshooting the ECM motor used in late model Nortek Global HVAC equipment. If you want additional information, check out this video all about troubleshooting using the Broad Ocean Motor Tester.

Do you have any other questions about air handlers containing ECM motors? Ask them in the comments below!

***NOTE: ONLY USE IF YOU ARE AN HVAC CONTRACTOR. If you are a homeowner trying to dip your toes into the DIY pool – STOP. Serious complications can arise when HVAC installations, repairs or maintenance are performed by someone who is unfamiliar with heating and air conditioning equipment. Drop the wrench, pick up the phone and call a professional.