If the HVAC system has been idle for one hour, the humidifier
control will activate the HVAC system fan to sample the air for
3 minutes. If the RH is lower than the set point, the humidifier
control will activate the humidifier and keep the fan running.
The humidifier will continue to operate for 2 hours or until the
humidification set point is reached.
If the RH set point has not been reached by the end of a call
for heat, the control will continue to operate the humidifier
and the HVAC fan until the humidification set point is reached
or 2 hours have elapsed.
When the “Blower Activation Switch” is in the “OFF“ position,
the humidifier control will only operate the humidifier if
humidity is required and the HVAC system fan is operating
or the HVAC system is producing heat.
NOTE:
If used in conjunction with a 8570 Communicating
Thermostat, and the blower activation feature is desired, DO
NOT wire the A B communication terminals.
Your EnviroAire IAQ Humidifier Control is installed in the
cold air return duct. During the first heating season, your
Humidifier Control needs to be set initially to match your
home’s condition. Please follow these steps when adjusting
your control (
refer to Figure A
).
AUTOMATIC MODE
1. Turn the dial setting knob to “5”, which is within the normal
range. During the next 24-48 hours it may be necessary
to adjust the dial for more or less humidity, depending on
your personal comfort and home’s requirements.
Refer to
TABLE 3 – Operation Guide on the following page.
2. During the coldest portion of the first heating season,
minor adjustments may be necessary. This is dependent upon
your home’s construction.
Refer to TABLE 3 – Operation
Guide on the following page.
The RH in your home will now be accurately controlled to meet
your needs and should not need further adjustment during future
heating seasons. Make note of the dial setting in the event you
temporarily move the knob to “OFF” when performing annual
maintenance of your EnviroAire IAQ humidifier.
When installed in the Manual Mode (
see Figure B
internal switch in “MAN” position and “M” in the display),
it is important to anticipate a drop in outdoor temperature
and reduce the setting accordingly to avoid excessive
condensation. For example, with an outdoor temperature of
20°F the correct setting will be 35% RH. If the temperature is
expected to fall to 0°F, then merely reduce the setting to 25%
several hours prior to the temperature change.
MANUAL MODE
See
Table 1
for the recommended settings. These settings,
which are based on years of research, represent a
compromise between RH levels that would be most desirable
for comfort and humidity levels that are suitable for protection
of your home and to avoid condensation on your windows.
For example, a wintertime indoor RH of 50% may be
considered ideal for comfort, but unfortunately, it probably
would result in condensation, which can cause damage to
your home. Observing the recommended RH levels on your
Humidifier Control is an important safeguard. Condensation
of water on the inside surface of windows in the form of
fogging or frost is usually an indication of too much humidity.
This same condensation can occur in other areas in your
home, possibly resulting in damage.
TABLE 1 - OUTDOOR TEMPERATURE/INDOOR RELATIVE HUMIDITY
Outside Temperature
RECOMMENDED RH
