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necessary to configure how the fan operates when using the
IAQ discrete input.
IAQ Discrete Fan Config (Configuration
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 over-
ride normal indoor fan operation during occupied or unoc-
cupied 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 auto-
matic fan).
•
IQ.I.F = 2 (Fan On Occupied/Unoccupied) — IAQ de-
mand will always override normal indoor fan operation
and turn it on (if off) during both the occupied and unoccu-
pied period.
Economizer Min Position (Configuration
EC.MN)
This is the fully occupied minimum economizer position.
IAQ Demand Vent Min Pos. (Configuration
DCV.C
IAQ.M)
This configuration will be used to set the minimum damper posi-
tion in the occupied period when there is no IAQ demand.
IAQ Econo Override Pos (Configuration
IQ.O.P)
This configuration is the position that the economizer goes to
when override is in effect.
OAQ Lockout Value (Configuration
This is the maximum OAQ level above which demand ventilation
will be disabled.
Diff. Air Quality Lo Limit (Configuration
DAQ.L)
This is the differential CO
2
dampers will be initiated.
Diff. Air Quality Hi Limit (Configuration
DAQ.H)
This is the differential CO
2
dampers will be at maximum and the dampers will be at the Con-
figuration
IAQ
DCV.C
DAQ ppm Fan On Set Point (Configuration
AQ.SP
D.F.ON)
This is the CO
level at which the indoor fan will be turned on.
2
DAQ ppm Fan Off Set Point (Configuration
AQ.SP
D.F.OF)
This is the CO
level at which the indoor fan will be turned off.
2
IAQ Low Reference (Configuration
IQ.R.L)
This is the reference that will be used with a non-Carrier IAQ sen-
sor that may have a different characteristic curve. It represents the
CO
level at 4 mA.
2
IAQ High Reference (Configuration
IQ.R.H)
This is the reference that will be used with a non-Carrier IAQ sen-
sor that may have a different characteristic curve. It represents the
CO
level at 4 mA.
2
OAQ Low Reference (Configuration
OQ.R.L)
This is the reference that will be used with a non-Carrier OAQ
sensor that may have a different characteristic curve. It represents
the CO
level at 4 mA.
2
IAQ
AQ.CF
IAQ
DCV.C
IAQ
IAQ
AQ.SP
IAQ
AQ.SP
OAQ.L)
IAQ
AQ.SP
level at which IAQ control of the
IAQ
AQ.SP
level at which IAQ control of the
EC.MN.
IAQ
IAQ
IAQ
AQ.S.R
IAQ
AQ.SR
IAQ
AQ.S.R
OAQ High Reference (Configuration
OQ.R.H)
This is the reference that will be used with a non-Carrier OAQ
sensor that may have a different characteristic curve. It represents
the CO
level at 4 mA.
2
Diff. IAQ Responsiveness (Configuration
IAQ.R)
This is the configuration that is used to select the IAQ response
curves as shown in Fig. 13.
PRE-OCCUPANCY PURGE
The control has the option for a pre-occupancy purge to refresh the
air in the space prior to occupancy.
This feature is enabled by setting Configuration
IAQ.P
IQ.PG to Yes.
The IAQ Purge will operate under the following conditions:
•
IQ.PG is enabled
•
the unit is in the unoccupied state
•
Current Time is valid
•
Next Occupied Time is valid
•
time is within two hours of the next occupied period
•
time is within the purge duration (Configuration
IAQ.P
IQ.P.T)
If all of the above conditions are met, the following logic is used:
If OAT IQ.L.O and OAT OCSP and economizer is available
then purge will be enabled and the economizer will be command-
ed to 100%.
Else, if OAT < IQ.L.O then the economizer will be positioned to
the IAQ Purge LO Temp Min Pos (Configuration
IAQ
IAQ.P
IQ.P.L)
If neither of the above are true, then the dampers will be posi-
tioned to the IAQ Purge HI Temp Min Pos (Configuration
IAQ
IAQ.P
IQ.P.H)
If this mode is enabled, the indoor fan and heat interlock relay
(VAV) will be energized.
IAQ Purge (Configuration
This is used to enable IAQ pre-occupancy purge.
IAQ Purge Duration (Configuration
This is the maximum amount of time that a purge can occur.
IAQ Purge Lo Temp Min Pos (Configuration
IAQ.P
IQ.P.L)
This is used to configure a low limit for damper position to be
used during the purge mode.
IAQ Purge Hi Temp Min Pos (Configuration
IAQ.P
IQ.P.H)
This is used to configure a maximum position for the dampers to
be used during the purge cycle.
IAQ Purge OAT Lockout Temp (Configuration
IAQ.P
IQ.L.O)
Nighttime lockout temperature, below which the purge cycle will
be disabled.
OPTIONAL AIRFLOW STATION
The ComfortLink controls are capable of working with a factory-
installed optional airflow station that measures the amount of out-
door air entering the economizer. This flow station is intended to
measure ventilation airflows and has a limitation as to the maxi-
mum flow rate it can measure. The limits are 18,000 cfm for sizes
030-050 and 31,000 cfm for sizes 055-100.
All configurations for the outdoor airflow station can be found in
the Configuration
rithm to function, the Outdoor Air Cfm Sensor Configuration
(OCF.S.) must be enabled.
90
IAQ
IAQ
IAQ
IAQ.P
IAQ
IAQ.P
ECON
CFM.C, sub-menu. For this algo-
AQ.S.R
AQ.SP
IAQ
IAQ
IQ.PG)
IQ.P.T)
IAQ
IAQ
IAQ
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Table of Contents
Troubleshooting
