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IQ.I.C = 1 (IAQ Discrete)
If the user sets IQ.I.C to 1 (IAQ Discrete), and the switch logic
(Configuration
SW.LG
switch reads low and a closed switch reads high.
If the switch is open, the economizer will be commanded to the
IAQ Demand Vent Minimum Position. If the outdoor flow station
is installed and outdoor air cfm can be read, the economizer will
move to the IAQ Demand Vent Minimum Flow CFM control set-
ting.
These settings may be adjusted and are located here:
Configuration
IAQ
DCV.C
Configuration
IAQ
DCV.C
If the switch is closed, the IAQ reading will be high and the econ-
omizer will be commanded to the Economizer Minimum Position.
If the outdoor airflow station is installed and outdoor air cfm can
be read, the economizer will move to the Economizer Minimum
Flow CFM control setting.
These settings may be adjusted and are located here:
Configuration
IAQ
DCV.C
Configuration
IAQ
DCV.C
IQ.I.C = 2 (IAQ Discrete Override)
If the user sets IQ.I.C to 2 (IAQ Discrete Override), and Configu-
ration
SW.LG
IAQ.L is set to OPEN, then an open switch
reads low and a closed switch reads high.
If the switch reads low, no action will be taken. If the switch reads
high, the economizer will immediately be commanded to the IAQ
Economizer Override Position. This can be set from 0 to 100%
and can be found at Configuration
FAN CONTROL FOR THE IAQ DISCRETE INPUT
Under Configuration
IAQ
Input Fan Configuration) must also be set. There are three config-
urations for IQ.I.F. Select the configuration that will be used for
fan operation. This configuration allows the user to decide wheth-
er the IAQ discrete switch will start the fan (if the supply fan is not
already running), and in which state of occupancy the fan will
start.
IQ.I.F = 0
Minimum Position Override Switch input will
not start fan.
IQ.I.F = 1
Minimum Position Override Switch input will
start fan in occupied mode only.
IQ.I.F = 2
Minimum Position Override Switch input will
start fan in both occupied and unoccupied modes.
IAQ ANALOG INPUT CONFIGURATION
This input is an analog input located on the main base board
(MBB). There are 4 different functions for this input. The location
of this configuration is at Configuration
IQ.A.C.
The functions possible for IQ.A.C are:
•
0 = no IAQ analog input
•
1 = IAQ analog input
•
2 = IAQ analog input used to override to a set position
•
3 = 4 to 20 mA 0 to 100% economizer minimum position
control
•
4 = 0 to 10,000 ohms 0 to 100% economizer minimum po-
sition control
Options 2, 3, and 4 are dedicated for third-party control.
IQ.A.C = 2 (IAQ Analog Input Used to Override)
Under Configuration
IAQ
mizer Override Position). The IQ.O.P configuration is adjustable
from 0 to 100%. These configurations are also used in conjunction
with Configuration
IAQ
IAQ.L) is set to OPEN, then an open
IAQ.M
O.C.MN
EC.MN
O.C.MX
IAQ
AQ.SP
IQ.O.P.
AQ.CF, the IQ.I.F (IAQ Discrete
IAQ
AQ.CF
AQ.SP, set IQ.O.P (IAQ Econo-
AQ.CF
IQ.A.F (IAQ 4 to 20 mA
Fan Configuration). There are three configurations for IQ.A.F and
they follow the same logic as for the discrete input. This configu-
ration allows the user to decide (if the supply fan is not already
running), if the IAQ Analog Minimum Position Override input
will start the fan, and in which state of occupancy the fan will start.
.
IQ.A.F = 0
IAQ analog sensor input cannot start the supply
fan.
IQ.A.F = 1
IAQ analog sensor input can start the supply fan
in occupied mode only.
IQ.A.F = 2
IAQ analog sensor input can start the supply fan
in both occupied and unoccupied modes.
If IQ.A.F is configured to request the supply fan, then configura-
tions D.F.ON and D.F.OF need to be set. These configuration set-
tings are located under Configuration
figure the fan override operation based on the differential air qual-
ity (DAQ). If DAQ rises above D.F.ON, the control will request
the fan on until DAQ falls below D.F.OF.
NOTE: If D.F.ON is configured below DAQ.H, the unit is in oc-
cupied mode, and the fan was off, then DAQ rose above D.F.ON
and the fan came on, the economizer will go to the economizer
minimum position (EC.MN).
The 4 to 20 mA signal from the sensor wired to TB201-8 and
TB201-7 is scaled to an equivalent indoor CO
rameters IQ.R.L and IQ.R.H located under the Configuration
IAQ
AQ.S.R menu. The parameters are defined such that 4 mA
= IQ.R.L and 20 mA = IQ.R.H. When the differential air quality
DAQ (IAQ – OAQ.U) exceeds the DAQ.H set point (Configura-
tion
IAQ
AQ.SP menu) and the supply fan is on, the econo-
mizer minimum vent position (Configuration
EC.MN) is overridden and the damper is moved to the IQ.P.O
configuration. When the DAQ falls below the DAQ.L set point
(Configuration
IAQ
moved back to the minimum vent position (EC.MN).
NOTE: Configuration OAQ.U is used in the calculation of the trip
point for override and can be found under Configuration
IAQ
AQ.SP.
IQ.A.C = 3 (4 to 20 mA Damper Control)
This configuration will provide full 4 to 20 mA remotely con-
trolled analog input for economizer minimum damper position.
The 4 to 20 mA signal is connected to terminals TB201-8 and
TB201-7. The input is processed as 4 mA = 0% and 20 mA =
100%, thereby giving complete range control of the effective min-
imum position.
The economizer sequences can be disabled by unplugging the
enthalpy switch input and not enabling any other economizer
changeover sequence at Configuration
Complete control of the economizer damper position is then pos-
sible by using a 4 to 20 mA economizer minimum position con-
trol or a 0 to 10,000 ohms 0 to 100% economizer minimum posi-
tion control via configuration decisions at Configuration
IAQ
IQ.A.C.
To disable the standard enthalpy control input function, unplug the
enthalpy switch and provide a jumper from TB201-6 to TB201-5
(see wiring diagrams in Major System Components section on
page 133).
IQ.A.C = 4 (10 Kilo-ohm Potentiometer Damper Control)
This configuration will provide input for a 10,000 ohm linear po-
tentiometer that acts as a remotely controlled analog input for
economizer minimum damper position. The input is processed as
0 ohms = 0% and 10,000 ohms = 100%, thereby giving complete
range control of the effective minimum position.
NOTE: For complete economizer control, the user can make
the economizer inactive by unplugging the enthalpy switch
connection.
43
IAQ
AQ.SP and con-
(IAQ) by the pa-
2
IAQ
AQ.SP menu), the economizer damper is
ECON
DCV.C
E.SEL.
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Troubleshooting
