Comment to an earlier post:
I am having a similar problem. I just installed a 600A humidifier and the control is set at 7. The 600A humidistat says that the air is at 42% RH, but I have two other humidity meters in the living area that read 33%. Does the 600A humidistat need calibration?
Aprilaires' Response:
Thank you for contacting us with regards to your model 600A Humidifier. The humidistat for this unit does not require calibration. It does, however, only update its display when it detects activity in the furnace, typically the heating mode. If the display constantly shows 42%, regardless of humidity changes in the home, the control may not be wired correctly. If the control does change its display, but stays around 9% apart from the other gauge, then the issue is just a discrepancy between devices. Most gauges will be accurate within 5% to 10% of actual humidity. With the humidity reading at 42% on the humidistat and the control setting at 7, we would expect that the humidifier will be running with each heat cycle of your furnace as long as outdoor temperature is 20°F or higher. If this unit is operating in the manual mode, it should run under these same conditions regardless of outdoor temperature.
I am having a similar problem. I just installed a 600A humidifier and the control is set at 7. The 600A humidistat says that the air is at 42% RH, but I have two other humidity meters in the living area that read 33%. Does the 600A humidistat need calibration?
Aprilaires' Response:
Thank you for contacting us with regards to your model 600A Humidifier. The humidistat for this unit does not require calibration. It does, however, only update its display when it detects activity in the furnace, typically the heating mode. If the display constantly shows 42%, regardless of humidity changes in the home, the control may not be wired correctly. If the control does change its display, but stays around 9% apart from the other gauge, then the issue is just a discrepancy between devices. Most gauges will be accurate within 5% to 10% of actual humidity. With the humidity reading at 42% on the humidistat and the control setting at 7, we would expect that the humidifier will be running with each heat cycle of your furnace as long as outdoor temperature is 20°F or higher. If this unit is operating in the manual mode, it should run under these same conditions regardless of outdoor temperature.
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