Filter
Top Products
THX9321 PRESTIGE
®
2.0 AND THX9421 PRESTIGE
®
IAQ 2.0 WITH EIM
77 68-0311—01
Fig. 150.
8. If Percent On Time was selected for ISU 10050, select
the Ventilation Percent on Time. See Fig. 151.
Fig. 151.
9. Select the Outdoor Condition Lockouts. See “Ventilation
— Outdoor Condition Lockouts (ISU 10130)” on page 75
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. 152.
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 ventila-
tion is locked out is limited to ensure that the ASHRAE
62.2 Ventilation Standard is met. See Fig. 152.
Fig. 152.
10. Select whether to lockout ventilation on humidification or
dehumidification calls. This feature is used to help reach
the user's desired humidity level by not allowing the ven-
tilation equipment to run during a call for humidification
or dehumidification. The thermostat will indicate whether
this meets or may not meet the ASHRAE 62.2 Standard
or the Percent On Time setting. See Fig. 153.
NOTE: ISU 10140 “Lockout Ventilation on Humidifica-
tion or Dehumidification Calls” is not an option
when you select “ASHRAE is Priority” at ISU
10125.
Fig. 153.