5407934-UIM-C-1119
Johnson Controls Ducted Systems
67
VENTILATION SETTINGS
Use the Ventilation Settings screens to view and edit settings associated
with home ventilation (ERV/HRV) devices. These screens are only
accessible in systems that have an ERV/HRV accessory control
installed. The following table describes the available settings.
There are additional settings for ventilation. These settings determine if
the ventilation device is opened during a call for conditioning. The ther-
mostat initiates ventilation any time there is a call for conditioning, that is,
when the outdoor temperature reaches a level that requires ventilation
as part of a heating or cooling call. Otherwise, the ventilation device runs
with the indoor blower as per the settings described in Table 26.
Ventilation can be controlled according to indoor humidity. If the outdoor
temperature is above 50°F and the indoor humidity rises above the
desired setting, the thermostat can be set to disable ventilation.
TABLE 25:
Ventilation Settings
Variable
Default Settings Explanation
Ventilation
Mode
Timed
Continuous,
Timed, or Off
This determines how often the
ventilation device is opened.
Ventilation
Runtime per
Cycle
20 min.
5–55 min in
5 min intervals
If Ventilation mode is set to Timed, the
thermostat allows ventilation per this
setting per the ventilation cycle time.
Ventilation
Cycle Time
1 hour
1–4 hours
If Ventilation mode is set to Timed, the
thermostat allows ventilation runtime per
this setting.
Ventilation
Limits
Disabled
Disabled,
Default, and
Manual
If a damper has been installed for venti-
lation purposes, this controls how the
damper operates.
No
Ventilation
Above
100°F
95°F, 100°F,
105°F
The thermostat does not allow
ventilation if the outdoor temperature
exceeds this setting.
No
Ventilation
Below
0°F
-5°F, 0°F, 5°F
The thermostat does not allow
ventilation if the outdoor temperature is
below this setting.