Research Products 620m Bypass Humidifier 18 Gpd Manual

Product Description

The RESEARCH PRODUCTS 620m is a large bypass evaporative humidifier designed for whole-house humidity control in residential forced-air systems. It delivers up to 18 gallons per day of moisture output, making it suitable for homes up to 5,300 square feet. The 620m uses an evaporative pad design fed by bypass airflow from the supply plenum, requiring no internal fan of its own. Manual control is handled via the included 4655 mechanical humidistat. A licensed HVAC technician or experienced installer typically handles the duct penetration, saddle valve connection, and 24-volt wiring during commissioning.

The 620m is intended for installation on residential forced-air heating systems with a gas, oil, or electric furnace. It mounts to the supply or return plenum using the included installation template and connects to a cold water line via the included 4001 saddle valve. The bypass duct carries warm air through the HydroCore evaporator pad, where moisture is absorbed and distributed throughout the living space. The unit is well-suited for new construction and retrofit applications in larger single-family homes where whole-house humidity management is part of an indoor air quality strategy.

Key Features

• Up to 18 gallons per day moisture output for high-capacity whole-house coverage
• Bypass evaporative design requires no dedicated blower motor
• Manual control via included 4655 mechanical humidistat
• Covers up to 5,300 square feet of living space
• Includes HYDROL L HydroCore evaporator pad for water-saving performance
• Complete installation kit included: transformer, saddle valve, control, and template

Compatibility

Compatible with the AprilAire Healthy Air System. Designed for residential forced-air HVAC systems. Includes the 4655 Manual Mechanical Control, HYDROL L HydroCore pad, 4010 24VAC 10VA transformer, and 4001 saddle valve for a complete installation.

Installation Notes

Installation should be performed by a qualified HVAC technician familiar with plenum penetrations, low-voltage wiring, and plumbing saddle valves. Shut off power to the furnace and close the water supply before beginning installation. Follow local mechanical and plumbing codes, including IFGC and IPC guidelines where applicable. Do not operate the humidifier without verifying the drain line is clear and the bypass damper is properly positioned for the season.

Technical Specifications

• Moisture Output: 18 gallons per day
• Coverage Area: Up to 5,300 square feet
• Control Type: Manual mechanical (4655 humidistat included)
• Transformer: 24VAC, 10VA (included)
• Height: 18 inches
• Width: 14.5 inches
• Depth: 11 inches
• Materials: Polycarbonate, Plastic

Standard Information

• Brand: RESEARCH PRODUCTS
• Manufacturer Part Number: 620m