75
IAQ Discrete Input Config (Configuration
→
IAQ
→
AQ.CF
→
IQ.I.C) — This configuration is used to set the type of IAQ
sensor. The following are the options:
•IQ.I.C = 0 (No Discrete Input) — This is used to indicate
that no discrete input will be used and the standard IAQ
sensor input will be used.
•IQ.I.C = 1 (IAQ Discrete Input) — This will indicate
that the IAQ level (high or low) will be indicated by
the discrete input. When the IAQ level is low, the
economizer minimum position will be Configuration
→
IAQ
→
DCV.C
→
IAQ.M.
•IQ.I.C = 2 (IAQ Discrete Input with Minimum Position
Override. This will indicate that the IAQ level (high or
low) will be indicated by the discrete input and the econ-
omizer minimum position will be the IAQ override posi-
tion, IQ.P.O (when high).
It is also necessary to configure how the fan operates when
using the IAQ discrete input.
IAQ Discrete Fan Config (Configuration
→
IAQ
→
AQ.CF
→
IQ.I.F) — This is used to configure the operation of the
fan during an IAQ demand condition. It has the following
configurations:
•IQ.I.F = 0 (No Fan Start) — IAQ demand will never
override normal indoor fan operation during occupied or
unoccupied period and turn it on.
•IQ.I.F = 1 (Fan On If Occupied) — IAQ demand will
override normal indoor fan operation and turn it on (if
off) only during the occupied period (CV operation with
automatic fan).
•IQ.I.F = 2 (Fan On Occupied/Unoccupied) — IAQ
demand will always override normal indoor fan opera-
tion and turn it on (if off) during both the occupied and
unoccupied period.
Economizer Min Position (Configuration
→
IAQ
→
DCV.C
→
EC.MN) — This is the fully occupied minimum economizer
position.
IAQ Demand Vent Min Pos. (Configuration
→
IAQ
→
DCV.C
→
IAQ.M) — This configuration will be used to set the
minimum damper position in the occupied period when there
is no IAQ demand.
IAQ Econo Override Pos (Configuration
→
IAQ
→
AQ.SP
���
IQ.O.P) — This configuration is the position that the econo-
mizer goes to when override is in effect.
OAQ 4-20 mA Sensor Config (Configuration
→
IAQ
→
AQ.CF
→
OQ.A.C) — This is used to configure the type of
outdoor sensor that will be used for OAQ levels. It has the fol-
lowing configuration options:
•OQ.A.C = 0 (No Sensor) — No sensor will be used and
the internal software reference setting will be used.
•OQ.A.C = 1 (OAQ Sensor with DAQ) — An outdoor
CO2 sensor will be used.
•OQ.A.C = 2 (4 to 20 mA Sensor without DAQ).
OAQ Lockout Value (Configuration
→
IAQ
→
AQ.SP
→
OAQ.L) — This is the maximum OAQ level above which de-
mand ventilation will be disabled.
Diff. Air Quality Lo Limit (Configuration
→
IAQ
→
AQ.SP
→
DAQ.L) — This is the differential CO2 level at which IAQ
control of the dampers will be initiated.
Diff. Air Quality Hi Limit (Configuration
→
IAQ
→
AQ.SP
→
DAQ.H) — This is the differential CO2 level at which IAQ
control of the dampers will be at maximum and the dampers
will be at the Configuration
→
IAQ
→
DCV.C
→
EC.MN.
DAQ ppm Fan On Set Point (Configuration
→
IAQ
→
AQ.SP
→
D.F.ON) — This is the CO2 level at which
the indoor fan will be turned on.
DAQ ppm Fan Off Set Point (Configuration
→
IAQ
→
AQ.SP
→
D.F.OF) — This is the CO2 level at which the
indoor fan will be turned off.
IAQ Low Reference (Configuration
→
IAQ
→
AQ.S.R
→
IQ.R.L) — This is the reference that will be used with a to
non-Carrier IAQ sensor that may have a different characteristic
curve. It represents the CO2 level at 4 mA.
IAQ High Reference (Configuration
→
IAQ
→
AQ.SR
→
IQ.R.H) — This is the reference that will be used with a
non-Carrier IAQ sensor that may have a different characteristic
curve. It represents the CO2 level at 4 mA.
NOTE: Calculating the IAQ.M and EC.MN damper position based
on differential IAQ measurement.
Based on the configuration 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. 12 — IAQ Response Curve
100
500
700
1000
INSIDE/OUTSIDE CO2 DIFFERENTIAL
INSIDE CO2 CONCENTRATION
AQ
DIFFERENTIAL
LOW (DAQ.L)
AQ
DIFFERENTIAL
HIGH (DAQ.H)
MINIMUM
IAQ
DAMPER
POSITION
ECONOMIZER
MINIMUM
DAMPER
POSITION
INCREASING VENTILATION
VENTILATION FOR PEOPLE
VENTILATION FOR SOURCES
Fig. 11 — IAQ Control