Install Instructions

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STEP 4: Blower Activation Feature Explanation
Set the Blower Activation switch to “ON”, see Figure J, to allow
the Humidifier Control to activate the furnace fan for additional
humidification. This may be required if the humidifier is mounted
on a heat pump or a furnace with short run cycles. When using
the Blower Activation feature, Model 400, 500, 600 and 700
series humidifers must be plumbed to hot water for effective
operation.
When the Blower Activation switch is “ON”, the Humidifier
Control will turn on the HVAC blower when humidity is required.
In the “OFF” position, the humidifier will only operate if humidity
is required and the HVAC system is operating.
When the Blower Activation switch is “ON”, the Humidifier
Control may extend the HVAC blower after a heat call for up to
two hours. If the HVAC system has been idle for one hour, the
control will turn the blower on for three minutes to sample
household air to determine if humidity is needed.
NOTE: If used in conjunction with an Aprilaire 8570
Communicating Thermostat, and the blower activation feature is
desired, DO NOT wire the A B communication terminals.
The Model 62 shipped with the Model 800 Steam Humidifier is
factory set to “OFF”. The Model 62 does not have the “Change
Water Panel” light on the Control. The Canister Change indicator
for the Model 800 is on the humidifier.
STEP 1: Mount the Humidifier Control
Humidifier Control must be mounted on the Return Duct, at least
6 inches upstream of the following (see Figure D):
• Humidifier
• Humidifier Bypass Ductwork (if applicable)
• Fresh Air Intake Ductwork (if applicable)
For accurate humidity control, mount the Humidifier Control at
least 12 inches upstream of the Steam Humidifier dispersion tube.
Ambient operating temperature of the Humidifier Control is to be
from 20°F to 120°F to prevent damage to the control display.
90-1137
6" MIN.
RETURN
DUCT
HUMIDIFIER
CONTROL
FRESH AIR
INTAKE
COIL
HUMIDIFIER
BYPASS
CONNECTION
INSTALLATION
Figure D