York J Series Manual page 57

OA Flow Cntrl Enable
This setting tells the control that the unit is equipped
with outside airflow measuring equipment and that the
outside air damper should be actively controlled to a
measured airflow.
Comfort Vent Mode
Comfort Ventilation operation will be carried out when
the Comfort Ventilation Mode is enabled.
Cmfrt Vent Max Dampr
This is the maximum Economizer damper position the
control will use for Comfort Ventilation.
IAQ Sensor Enable
When set to ON, this parameter tells the control that an
IAQ Sensor is to be used for control of the Economizer
(outside air damper). The control will use the Demand
Ventilation Setpoint to control the IAQ levels in the
building by modulating the Economizer. The default set-
ting of this option is ON. The IAQ Sensor will normally
be field installed. When the IAQ Sensor is not enabled,
the sensor status is ignored. A 1kW "pull-down" resistor
will be factory installed on the IAQ Sensor input. This
resistor will be removed when a field-installed IAQ
Sensor is added. The pull-down resistor guarantees that
the Demand Ventilation control algorithm will remain
inactive when the IAQ Sensor is not installed, and will
not interfere with a normal Economizer operation.
IAQ Sensor Span
This tells the control what the full range (span) is for
the installed IAQ Sensor. The IAQ Sensor is generally
expected to be a CO sensor. Other types of IAQ Sen-
2
sors may be used.
DV Multiplier
This tells the control what the Maximum Demand Venti-
lation Multiplier (DVM) is. The Maximum DVM is a
multiplier limit that the control will not exceed when
resetting (overriding) the outside air damper or AMS
(Air Measuring Station) setpoints.
Altitude
The value entered into Altitude is the altitude of the unit
above sea level. This value is used only when an Air
Measurement Station is installed and Outdoor Airflow
Control is enabled. The altitude value is to be entered
within 1000 feet of actual.
JOHNSON CONTROLS
Morning Warm-Up
When this option is turned ON, the Morning Warm Up
feature is enabled and can be started. Morning Warm
up is an option in Networked (BAS) applications or
internally scheduled applications.
• With a Networked application, Morning Warm Up
will be initialized by an appropriate network com-
mand.
• Morning Warm Up Enable must be turned ON.
• Internal Time Clock/Scheduling must be turned
OFF.
• With Internal Time Clock/Scheduling, Morning
Warm Up will automatically initialize based on
an internal algorithm that calculates the amount of
time necessary to reach setpoint before the occupied
period begins.
• Morning Warm Up Enable must be turned ON.
• Internal Time Clock/Scheduling must be turned
ON.
Max Warm-Up Time
This is the maximum time the control will conduct
Morning Warm Up.
Pre-Occupancy Purge
When this option is enabled, the Control will start Purge
per the Pre-Occupancy Purge Schedule. On the start of
the Purge, the control will, at the time Pre-Occupancy
Purge is scheduled, the controller will compare the
OAT to the High and Low purge limits. When enabled,
Pre-Occupancy Purge will be performed per the daily
Pre-Occupancy Purge schedule.
If the OAT is between the limits:
• The Supply Fan will be turned ON to 100%.
• The Economizer will be open to 100% outdoor air
(0% return air).
If the OAT is outside of the limits, operation will con-
tinue in the unoccupied mode (no purge will be done).
Pre-Occupancy Purge will terminate:
• At the shut off time of the Pre-Occupancy Purge
Schedule.
• When occupancy is detected.
FORM 100.50-NOM7 (808)
57
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