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Installation
Read the instructions in the furnace installation manual carefully before attempting installation
or operation of the humidifier. Failure to follow these instructions may result in improper
installation and therefore, void the manufacturer’s warranty.
WARNING
Improper electrical wiring can cause personal injury, death, or
property damage. Local codes require that the unit be installed
by a properly qualified HVAC technician or electrician.
Some furnaces provide 120VAC (220-240VAC International) auxiliary terminals that may be
used to power the humidifier. Since these auxiliary terminals are interlocked with the fan, no
separate fan interlock relay is required in the humidistat circuit depending on the furnace
model. These terminals are marked HTG.Acc/Neutrals. Acc/Neutral or Hum-H/Hum-N.
When connected to these furnaces using the auxiliary terminals interlocked to the furnace fan,
connect the primary of the supplied 120VAC (220-240VAC International) to 24VAC transformer
to the auxiliary terminals on the furnace. Connect the secondary of the transformer to the unit
pigtails on the SPST humidistat provided. The humidifier will then turn on whenever the
furnace fan is running and there is a call for humidity.
For systems without 120VAC (220-240VAC International) or 24VAC auxiliary terminals or
systems with multi-speed blowers, the switch contacts of a separate SPST-NO fan interlock relay
is required to be wired in series with the humidistat switch. Depending on the installation and
furnace manufacturer the coil for this relay could be:
• Wired in parallel with the coil of the NO fan relay, typically 24VAC.
• Wired in parallel with the common and heating speed tap of the units blower typically
120VAC or 240VAC.
• An inductively coupled current sensing relay on the common of the units blower.
See installation instructions on the provided
mounting template