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WARNING
1. 120 volts may cause serious injury from electrical
shock. Disconnect electrical power to the furnace
before starting installation.
2. Sharp edges may cause serious injury from cuts.
Use care when cutting plenum openings and handling
ductwork.
CAUTION
1. Do not set humidity higher than recommended.
Condensation damage may result.
2. Do not set humidity up to recommended levels if there is
condensation on the inside of windows of any unheated
living space. Condensation damage may result.
3. Do not mount the Manual Humidifier Control on the
supply plenum or duct. The unit cannot withstand
supply temperatures and will malfunction.
4. Do not mount the Manual Humidifier Control downstream
of the bypass outlet. False humidity conditions will cause
the humidifier to operate incorrectly.
THESE INSTALLATION INSTRUCTIONS ARE FOR
THE APRILAIRE MANUAL HUMIDIFIER CONTROL ONLY!
For Aprilaire
®
humidifier installation, follow Aprilaire
Humidifier Installation Instructions.
The Manual Humidifier Control (Part 4655) is designed for low
voltage service to control humidification equipment. An increase
in relative humidity (RH) expands the nylon ribbon which opens
the control switch to stop operation of the humidifier. A decrease
in RH reverses the process and closes the control switch.