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ACCESSORY CONTROL DETAILS
ELECTRONIC AIR CLEANER OPERATION
The Model 6504 is equipped with control capabilities for your Electronic Air Cleaner to assure its operation during all times the
system blower is active. In addition, there is an LED labeled “EAC” on the control panel to display that the air cleaner is running.
Your thermostat has a built-in monitor to alert you when it’s time to change the media in your air cleaner. Consult your thermostat
owners’ manual for details.
VENTILATION CONTROL OPERATION
The Model 6504 is equipped with control capabilities for either an Energy Recovery Ventilator (ERV) or a fresh air intake damper.
Consult your installer to determine which type of ventilation was installed.
There are two settings adjusted through dip switches on the Model 6504
Control Panel that control the amount of ventilation that will be delivered to
your home. One is the Vent Cycle and the other is the Vent Time. Here’s how
it works: if you set the Vent Cycle to 1 hour and the Vent Time to 15 minutes,
you will get 15 minutes of ventilation every hour. It is important to understand
that the ventilation requirement (15 minutes per hour in this example) may be
satisfied during a heating, cooling or continuous fan call initiated by your
thermostat or from the control panel itself. For example, if, during the one
hour Vent Cycle, your HVAC equipment only turned on for 10 minutes, you
would get ventilation during that 10 minutes of equipment run time, and then
the control panel would turn on the fan during the last 5 minutes of the Vent
Cycle to ensure that you receive the full 15 minutes of ventilation.
VENT TIME – Sets the amount of time that the ERV will operate or the
Ventilation Damper will be open during the Vent Cycle Period.
VENT CYCLE – Sets the period over which the amount of ventilation run time
will be summed. For example, if the Vent Time is set for 30 minutes and the
Vent Cycle is set for 1 hour, the ERV or Ventilation Damper will be operated for
30 minutes per hour.
An Energy Recovery Ventilator (ERV) like the Aprilaire Model 8100, exchanges heat and moisture from the indoor air to the
outdoor air ensuring that air is pre-conditioned before entering your home or office. The control panel will not limit ventilation
when controlling an ERV. Use of a Ventilation Damper is an economical way to get outdoor air into your home or office, but unlike
the ERV it does not pre-condition the air. Control of a ventilation damper is enhanced by the Model 6504 Control Panel when an
outdoor temperature sensor is installed with your system and enhanced even more when an Aprilaire Automatic Humidifier has
been installed. Direct ventilation from outside can increase the heating or cooling load on your heating and cooling equipment or
cause uncomfortably cool or warm drafts. Bringing in moist air can cause the indoor relative humidity to reach uncomfortable,
“stuffy feeling” levels. With an outdoor temperature sensor installed, the control panel will discontinue ventilation if the outdoor
temperature is above 100°F or lower than 0°F, and will limit ventilation to occur only when the heat is on when the outdoor
temperature is between 20°F and 0°F. When an Aprilaire Automatic Humidifier is installed, ventilation is also discontinued when
the indoor relative humidity is above 55% RH and the outdoor temperature is above 50°F.
15 minutes 30 minutes 45 minutes 60 minutes
1 Hour 2 Hours 3 Hours 4 Hours
DIP SWITCHES LOCATED
ON MODEL 6504 CONTROL PANEL