Specifications

74
IAQ DISC.IN FAN CONFIG (IA.IF) — This is used to
configure the operation of the fan during an IAQ demand
condition. It has the following configurations:
• NEVER — The routine will not control the indoor fan and
the fan must be turned on by other routines.
• OCCUPIED – Fan will be turned on during the occupied
period, but not in the unoccupied period.
• ALWAYS–IAQwillalwaysturnthefanonwhenanIAQ
condition exists.
IAQ DEMAND VENT MIN POS. (AQ.MP) — This config-
uration will be used to set the minimum damper position in the
occupied period when there is no IAQ demand.
ECONOMIZER MIN POSITION (MIN.P) — This is the fully
occupied minimum economizer position. It is configured in the
CONFIGURATION-ECON submenu.
IAQ PURGE (PRG.E) — This is used to enable IAQ pre-
occupancy purge.
IAQ PURGE DURATION (PRG.D) — This is the config-
urable time that will be used to turn on purge prior to occupancy.
IAQ PURGE LO TEMP MIN POS (PG.LT) — This is used
to configure a low limit for damper position to be used during
the purge mode.
IAQ PURGE HI TEMP MIN POS (PG.HT) — This is used
to configure a maximum position for the dampers to be used
during the purge cycle.
IAQ ECONO OVERRIDE POS (OVR.P) — This configu-
ration is the position that the economizer goes to when the
override switch is closed.
OAQ 4-20MA SENSOR CONFIG (OA.CF) — This is used
to configure the type of outdoor sensor that will be used for
OAQ levels. It has the following configuration options:
• NO OAQ — No sensor will be used and the internal soft-
ware reference setting will be used or a configured set point
using the OAQ Set Point (OA.SP) which is located in the
CONFIGURATION-IAQ submenu.
• DCV OAQ — When this configuration is selected the
Demand Control Ventilation routine will use the OAQ sen-
sor as the reference level to compare the IAQ measured
value.
• LOCKOUT — If this configuration is selected then the
OAQ sensor will be used for lockout of demand ventilation
but will not be used for the OAQ reference level. This is a
4 to 20 mA input.
OAQ LOCKOUT VALUE (OAQ.L) — This is the maximum
OAQ level above which demand ventilation will be disabled.
DIFF.AIR QUALITY LOLIMIT (AQD.L) — This is the
differential CO
2
level at which IAQ control of the dampers will
be initiated.
DIFF.AIR QUALITY HILIMIT (AQD.H) — This is the dif-
ferential CO
2
level at which IAQ control of the dampers will be
at maximum and the dampers will be at the MIN.P.
DAQ PPM FAN ON SETPOINT (DF.ON) — This is the CO
2
level at which the indoor fan will be turned on.
DAQ PPM FAN OFF SETPOINT (DF.OF) — This is the CO
2
level at which the indoor fan will be turned off.
IAQ LOW REFERENCE (I.4M) — This is the reference 4 to
20 mA signal level that will be used with a the IAQ sensor
to correct for non-Carrier sensors that may have different
characteristic curves. It represents the CO
2
levelat4mA.
IAQ HIGH REFERENCE (I.20M) — This is the reference 4
to 20 mA signal level that will be used with a the IAQ sensor to
correct for non-Carrier sensors that may have different charac-
teristic curves. It represents the CO
2
levelat20mA.
OAQ LOW REFERENCE (O.4M) — This is the reference 4
to 20 mA signal level that will be used with a the OAQ sensor
to correct for non-Carrier sensors that may have different char-
acteristic curves. It represents the CO
2
levelat4mA.
OAQ HIGH REFERENCE (O.20M) — This is the refer-
ence 4 to 20 mA signal level that will be used with a the OAQ
sensor to correct for non-Carrier sensors that may have differ-
ent characteristic curves. It represents the CO
2
levelat20mA.
DIFF.IAQ RESPONSIVENESS (I.CRV) — This is the con-
figuration that is used to select the IAQ response curves as
shown in Fig. 27.
Fig. 26 — IAQ Control
100
500
700
1000
INSIDE/OUTSIDE CO
2
DIFFERENTIAL
INSIDE CO
2
CONCENTRATION
AQ
DIFFERENTIAL
LOW (AQD.L)
AQ
DIFFERENTIAL
HIGH (AQD.H)
MINIMUM
IAQ
DAMPER
POSITION
ECONOMIZER
MINIMUM
DAMPER
POSITION
INCREASING VENTILATION
VENTILATION FOR PEOPLE
VENTILATION FOR SOURCES
NOTE: Calculating the IAQMIN and ECONOMIN damper position
based on differential IAQ measurement.
Based on the config parameter IAQREACT, the reaction to damper
positioning based on differential air quality ppm can be adjusted.
IAQREACT = 1 to 5 (more responsive)
IAQREACT = 0 (linear)
IAQREACT = –1 to –5 (less responsive)
Fig. 27 — IAQ Response Curve