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Aprilaire 8825 Installation, Configuration And User Manual page 32

System controller

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The Thermostat Settings tab contains a tab at the bottom for each thermostat in your climate system.
For each thermostat, tabs across the top allow you to access pages to control Temperature, Mode
(heating or cooling), control the thermostat's Schedule and view the climate History.
The Temperature page allows you to:
View the current inside temperature, and if optional sensors are installed, view the remote
temperature or humidity.
Temporarily or permanently adjust the current setpoint.
When you make a change to the current setpoint of the thermostat, you are asking the system to maintain
a temperature that is different from the temperature called for by the current schedule. On the System
Controller, this is done either as a Timed Temporary Hold or as a Permanent Hold.
With Timed Temporary holds, the thermostat maintains the new setpoint for a pre-defined period of time,
which by default is four hours, with a plus or minus 5 degree change allowed to the setpoint. For
example, in an office where the temperature during the unoccupied period is set back, an employee
comes in to work for a short while. They press the buttons on the thermostat in their office to raise the
setpoint and make the space comfortable while they are there, and thereby start a Timed Temporary Hold
at that new setting. If they forget to set the temperature back when they leave, the system will
automatically set it back for them after the default four hours have elapsed.
Note that users can only change the setpoint a limited number of degrees by pressing the up and down
buttons on the actual thermostat. This is the Setpoint Limit, and is set in the Configurator: see To set the
Setpoint Limit and Hold Time for thermostats in Section 2.
If a setpoint should be held indefinitely, the controller offers a Permanent Hold. When this mode is active
the setpoint is maintained until a user switches back to either Run Program or Timed Temporary Hold.
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