Carrier 48/50AJ IAQ Control, IAQ Response Curve, Point Configuration→IAQ→AQ.SP→D.F.ON. The fan

ECONOMIZER MINIMUM DAMPER POSITION

MINIMUM

IAQ

DAMPER

POSITION

VENTILATIONINCREASING VENTILATION FOR PEOPLE

VENTILATION FOR SOURCES

•IQ.A.C = 4 (10K potentiometer minimum position) — With a 10K linear potentiometer connected to TB5-6 and 7, the economizer minimum position will be scaled linearly from 0% (0 kilo-ohms) to EC.MX (10 kilo-ohms).

IAQ Analog Fan Config (Configuration→IAQ→AQ.CF→ IQ.A.F) — This configuration is used to configure the control of the indoor fan. If this option is used then the IAQ sensor must be in the space and not in the return duct. It has the fol- lowing configurations:

• IQ.A.F = 0 (No Fan Start) — IAQ demand will never

override normal indoor fan operation during occupied or

unoccupied period and turn it on.

• IQ.A.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).

100	700	INSIDE/OUTSIDE CO2 DIFFERENTIAL
500	1000	INSIDE CO2 CONCENTRATION
AQ	AQ
DIFFERENTIAL	DIFFERENTIAL	A48-7209
LOW (DAQ.L)	HIGH (DAQ.H)

Fig. 12 — IAQ Control

A48-7711

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. 13 — IAQ Response Curve

• IQ.A.F = 2 (Fan On Occupied/Unoccupied) — IAQ

demand will always override normal indoor fan operation

and turn it on (if off) during both the occupied and unoccu-

pied period. For IQ.A.F = 1 or 2, the fan will be turned on as

described above when DAQ is above the DAQ Fan On Set

Point (Configuration→IAQ→AQ.SP→D.F.ON). The fan

will be turned off when DAQ is below the DAQ Fan Off Set

Point (Configuration→IAQ→AQ.SP→D.F.OF). The con-

trol can also be set up to respond to a discrete IAQ input.

The discrete input is connected to TB5-6 and 7.

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 economizer minimum position will be the IAQ override position, IQ.O.P (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 operation and turn it on (if off) during both the occupied and unoccupied period.

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).

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