How Does a Whole House Humidifier Work?

Whole House Humidifiers: Installation and Operation

Overview of Whole House Humidifiers

• There are various styles of whole house humidifiers, all requiring similar key components and operating on the same principle. A hole is cut in the ductwork to mount the humidifier case.

Components and Functionality

• The humidifier can be installed on either the supply or return side of the ductwork. It contains an evaporator pad fed by a waterline, which should have a shutoff valve.

• A solenoid, controlled by a humidistat, regulates water flow into the humidifier when humidity levels drop below a setpoint. The humidistat may be integrated with a thermostat or function as a separate control.

Water Distribution Mechanism

• When activated, the solenoid allows water to flow onto an evaporator pad tray designed to disperse water evenly across its surface.

• The evaporator pad holds water in cup-like shapes; excess drains away through a drain line to either a floor drain or condensate pump.

Types of Humidifiers and Airflow

• Drum humidifiers utilize pads that roll through water, while powered humidifiers use fans to draw air over the evaporator pad, returning moist air into the ductwork.

• Bypass humidifiers connect via take-off ducts; dampers control airflow based on seasonal needs—closed during summer and open in winter.

Operational Considerations

• Some steam humidifiers do not require furnace blowers for moisture distribution but rely on them when operational. Power must be supplied for proper functioning.

• Once conditions necessitate humidity increase, power is sent from the humidistat to open the solenoid for water flow. After sufficient water passes through, it closes again for efficient operation.

This structured overview provides insights into how whole house humidifiers work, their installation requirements, and operational mechanisms essential for maintaining indoor humidity levels effectively.