Honeywell Prestige 2.0 THX9421 Manual page 117

8. If Percent On Time was selected for ISU 10050,
select the Ventilation Percent on Time. See Fig. 260.
Fig. 260.
9. Select the Outdoor Condition Lockouts. See "Venti-
lation — Outdoor Condition Lockouts (ISU 10130)"
on page 115 for more information.
When ISU 10125 Ventilation Priority is set to Lockouts
are Priority, or ISU 10050 Ventilation Control Methods is
set to Percent On Time, the thermostat will indicate
whether this meets or may not meet the ASHRAE 62.2
Standard or the Percent On Time setting. See Fig. 261.
When ISU 10125 Ventilation Priority is set to ASHRAE
is Priority, the screen below will indicate the maximum
length of time that ventilation can be locked out over a
21 hour time period. For example, Ventilation Lockout
Will Not Exceed 12.5 hours. The length of time that ven-
tilation is locked out is limited to ensure that the
ASHRAE 62.2 Ventilation Standard is met. See Fig.
261.
Fig. 261.
10. Select whether to lockout ventilation on humidifica-
tion or dehumidification calls. This feature is used to
help reach the user's desired humidity level by not
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THX9321 PRESTIGE 2.0 AND THX9421 PRESTIGE
allowing the ventilation equipment to run during a
call for humidification or dehumidification. The ther-
mostat will indicate whether this meets or may not
meet the ASHRAE 62.2 Standard or the Percent On
Time setting. See Fig. 262.
NOTE: ISU 10140 "Lockout Ventilation on Humidi-
fication or Dehumidification Calls" is not an
option when you select "ASHRAE is Priority"
at ISU 10125.
11. Select whether to Ventilate on High Indoor Humidity.
See "Ventilate on High Indoor Humidity (ISU
10160)" on page 115 for more information. See Fig.
263.
Control Ventilation Level
1. Press MENU, then scroll to select Ventilation.
2. Press Setting to set the operating mode.
• Automatic: Ventilation runs as programmed by
the installer (ASHRAE or Percent On Time).
• Off: Ventilation remains off unless turned on by
the timer or from a Vent Boost Remote.
• On: Ventilation is always on.
3. Press  or  to run ventilation temporarily. The
Temporary Boost (timer) setting range is 0–180 in
20 minute increments. To turn Temporary Boost off,
set to zero or press Cancel Temporary Boost.
117
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IAQ WITH EIM
Fig. 262.
Fig. 263.
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