Ventilation Settings - Johnson Controls Hx 3 S1-THXU430W Installation Manual

5407934-UIM-C-1119

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.
TABLE 25: Ventilation Settings
Variable Default Settings
Ventilation
Timed
Mode
Ventilation
Runtime per 20 min.
Cycle
Ventilation
1 hour
Cycle Time
Ventilation
Disabled
Limits
No
Ventilation 100°F
Above
No
Ventilation 0°F
Below
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.
Johnson Controls Ducted Systems
Explanation
Continuous, This determines how often the
Timed, or Off ventilation device is opened.
If Ventilation mode is set to Timed, the
5–55 min in
thermostat allows ventilation per this
5 min intervals
setting per the ventilation cycle time.
If Ventilation mode is set to Timed, the
1–4 hours thermostat allows ventilation runtime per
this setting.
Disabled, If a damper has been installed for venti-
Default, and lation purposes, this controls how the
Manual damper operates.
The thermostat does not allow
95°F, 100°F,
ventilation if the outdoor temperature
105°F
exceeds this setting.
The thermostat does not allow
-5°F, 0°F, 5°F ventilation if the outdoor temperature is
below this setting.
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