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1. Disconnect electrical power to the furnace before starting installation. Failure to do so could result in serious injury from electrical shock. 2. Sharp edges may cause serious injury from cuts. Use care when making plenum openings and handling duct work. 3. Hot water temperatures in excess of 125°F may cause serious injury from burns. Make sure water supply is shut off before connecting the water supply.
1. Do not install unit where freezing temperatures could occur. 2. Do not install unit or bypass connection on the furnace jacket. 3. Do not install unit or bypass connection on a plenum face where the blanked off ends of the cooling coil restrict air movement through the humidifier. 4. Do not set humidity higher than recommended. Condensation damage may result 5. Do not connect the transformer of the Model 550 to multi-speed furnace blower motors or blower motors other than 120 VAC. Premature component failure may result. Use the Model 50 Current Sensing Relay. 6. Do not set humidity up to recommended levels if there is condensation on the inside windows of any unheated living space. Condensation damage may result. 7. Do not install unit on the supply plenum where static pressure exceeds 0.3" W.C. 8. Do not install humidifier where water pressure exceeds 125 psi, since damage may result. Follow codes in effect concerning pressure reduction. 9. Sundry hardware (not supplied) may be required for humidifier installation. |
Use 120VAC power source other than furnace motor circuit. However, the transformer can be powered off the 120VAC line before it enters the furnace
Some furnaces are equipped with accessory terminals that cam be used for the humidifier. The Aprilaire Model 50 Current Sensing Relay (Optionally Available) may not be necessary in this case. Consult your furnace manufacturers recommendations for wiring instructions.