As you know, a variable speed heat pump works by adjusting the speed of the fan motor to ensure proper airflow throughout the home. Variable speed heat pumps are an incredible way to balance the temperature and humidity in the home, but they are only effective if all of the settings are correct. So, if your customer is complaining of a slow blower motor, your first step is to check the settings.
Why a Slow Blower Matters
Why is this a problem? A slow blower is only beneficial if you are trying to dehumidify the space more than you are trying to regulate the temperature. When the blower runs faster, more heat will be removed from the air instead of moisture. However, if the blower runs slower, more moisture will be removed from the air instead of heat.
What to Check to Make a Blower Run Faster
If your customer’s variable speed blower motor won’t hit full speed, the first thing you need to do is make sure the pins are set properly. Double check that the kilowatts, tonnage, and low or high airflow are all where they should be. Once you have made sure the pins are correct, it’s time to check the calls. This is what you should look for:
- Do you have your Y on the right Y? If you have it on stage 1 on a single stage piece of equipment, it will run on very low, low speed. You need to be on Y/Y2 or just Y2 depending on the model.
- Make sure you have a blower call on G whenever you have a call on Y. A lot of these systems will run really slowly if you don’t have a G call. If you have a Y call and not a G call, it will run at a very low blower speed–it’s the super dehumidify speed and it is not practical for most situations.
- If it is not in dehumidification mode or it doesn’t have a DH thermos, you will want to make sure you have a call on your DH mode (dehumidifier mode).
If you want your customer’s heat pump to run at full speed, those are the calls that need to be in place. If you make sure all of those call placements are correct and the heat pump is still having run speed issues, then you may need to do some more troubleshooting. Just make sure you check the calls first, because it is a simple and quick fix that gets the job done more often than not.
If you want to learn more about how you can troubleshoot technology to help your customers’ equipment operate at peak efficiency, contact CE now.