The HCWP3-18 Healthy Climate® Power Humidifier attaches to the home's furnace or air handler and adds moisture to air moving through the duct system. Includes Safety, Operating, and Maintenance Instructions. OPERATING INSTRUCTIONS FOR HCWB3-18A humidifiers are controlled by an automatic humidifier. Automatic Humidifier Control - HCWP3-18A models. Duct mount only. Automatic or manual mode control. Manual Mode label. (with resistor to bypass outdoor View online (2 pages) or download PDF (500 KB) Lennox HCWP3 Series Humidifiers Installation instructions • HCWP3 Series Humidifiers fireplaces PDF manual These installation instructions are for the Healthy. Climate Humidifier Control only! For Healthy Climate Humidifier installation, follow. Healthy Climate Buy Lennox Power Humidifier 18 Gal/Day Automatic Control HCWP3-18A. Lennoxl Healthy Climate Power Humidifier 18 Gallon/Day Manual Control HCWP3-18.Humidifier Installation Instructions. Figure A. Figure C. A. C. B. HUMIDIFIER. POWER HUMIDIFIER. MODEL. WP2-18A. STEP 2: Disassemble the Humidifier Control. Customers Who Viewed This Product Also Viewed · Lennox Healthy Climate Power Humidifier 18 Gallon/Day Automatic Control HCWP3-18A.