Frequently Asked Questions

 The water pressure regulator is a unidirectional device and must be connected in its designated flow direction. Check the flow direction mark or label on the regulator body before connecting it to the water lines. If connected incorrectly, it will be unable to regulate the pressure and may result in excessive water leakage. 

Don't try to turn the pressure all the way down to zero to shut off the water, which will cause water leakage. It is a water pressure regulator, not a shut off valve. 

When considering the mounting location of a humidifier, several factors need to be taken into account to ensure optimal performance and efficiency. These factors include:

1. Temperature: The hot air temperature must fall within the range of 100°F to 150°F. This temperature range ensures that the water mist can evaporate efficiently without being too low to cause slow evaporation or too high to potentially damage the humidifier.

2. Hanging time in the air: Placing the humidifier where the mist can hang in the air for as long as possible ensures maximum evaporation efficiency. It is essential to avoiding locations where the mist may come into contact with duct walls or other surfaces, which can lead to water puddles and leakages.

3. Number of nozzles: An ideal mounting location should accommodate the installation of a sufficient number of nozzles (maximum of 5). The best location for mounting is typically at a "T-section" above the AC coil in the furnace plenum. If mounted on a horizontal duct with at least 10” height, the number of nozzles will be limited by the duct width as explained in Fig. 8 of the user manual.  

The DIGI MISTER humidifiers can support max. 5 fine mist nozzles. These nozzles are specially designed to be used for low pressure applications. They have a tiny orifice hole (0.1mm) and several small components which must work together perfectly to form a fine water mist. Due to such large volume mass production these components cannot be exactly the same in dimension, shape, surface finish, etc. so each nozzle will perform differently. We cannot guarantee that all the nozzles work flawlessly. Users must use the nozzle tester to easily test and clean all the nozzles, no matter new or used, before installing on the humidifier. DO NOT INSTALL FAULTY NOZZLES in your humidifier.

The DIGI MISTER humidifier can support 1 to 5 nozzles depending on the size of the furnace, duct and homes. There are at least 2 or more extra nozzles provided with each humidifier. It is possible that some of the customers with large size houses may not have enough good nozzles to put into their humidifier. In these cases, you can purchase new nozzles from our store on Amazon or Walmart.com.  DO NOT USE OTHER TYPES OF SPRAY NOZZLES. 

In this case you need to reduce the number of the nozzles or reduce the water pressure because the furnace hot air cannot vaporize all the water mist sprayed. You can also try to increase the triggering hot air temperature or increase the draft motor speed for quicker evaporation. But there is a limitation of amount of water mist which can be evaporated in the passing hot air depending on the hot air moving speed and temperature.

In rare cases the orifice hole of some nozzles may become too wide due to wear and tear, which causes too much mist to be sprayed out. These faulty nozzles must be identified and replaced. 

In general, the multi-stage furnaces with variable speed blower will run in a   slow motor speed and a relatively low hot air temperature (but not below 100℉). Due to slow air   movement, you can use a few spray nozzles (like 1 or 2) or adjust to a lower water pressure first to check if the water mist can evaporate fully, only increase nozzles if it is okay. You may get enough humidity with fewer nozzles or low water pressure because this type of furnace is usually running at lower stage with long period time or almost constantly on.   

No, for the DM530 and DM538, connecting to a permanent 24VAC power source is not recommended. The DIGI MISTER humidifier is designed to operate in conjunction with the forced air furnaces. It only turns on and off together with the furnaces, so that some of its electric components, such as temperature sensor, white LEDs and UVC LEDs can function over a long period of time. In addition, the DM538 requires moving air from the furnace to prevent the UVC LEDs from overheating.

 The DIGI MISTER humidifier must be powered up by a 24VAC class II transformer (not provided) connected to the 120V power lines on the furnace main control board. Don’t connect it to a low power 24V terminal on the control board. Its electrical connection is not as simple as a “plug & play” indoor portable humidifier. Certain HVAC expertise is needed to perform the installation.  Please consult a professional HAVC technician, or contact us by phone call, message, or email. We will help you to resolve the issues. 

 Yes, you can use a smart furnace thermostat to partially control the DIGI MISTER humidifier. If you use the humidifier control function of a Nest or EcoBee thermostat which could provide 24VAC and above 0.5A current to power up the DIGI MISTER humidifier, make sure to select "Hum.+Heat" for activate and set a high target humidity level on the DIGI MISTER. In this way the humidifier will be powered on when the smart thermostat calls for humidity and for heat. However, you must set the hot air temperature above 100℉ so that the water mist can be sprayed and fully evaporated when the air temperature in the duct reaches the setting point. 

The enclosure materials of the DIGI MISTER humidifiers are UL 746C Yellow Card materials, suitable for use with respect to exposure to ultraviolet light, water exposure and immersion. It is allowed some discolor with the time on the surface, but the material strength and any other characteristics will not be affected. There is a SGS Certification sign on each of our products, customers can be sure that there are no safety issues associated with our humidifiers.