40
In either case, it will be necessary to install a controls expan-
sion module (CEM). The control interfaces to a switch input at
TB202-10 and TB202-11.
DEMAND LIMIT DISCRETE INPUTS — First, set DM.L.S
in Configuration
BP
DMD.L to 1 (2 switches).
When Inputs
GEN.I
DL.S1 (Demand Switch no. 1) is
OFF, the control will not set any limit to the capacity, and
when ON, the control sets a capacity limit to the Configura-
tion
BP
DMD.L
D.L.S1 set point.
Likewise, when Inputs
GEN.I
DL.S2 (Demand Switch
no. 2) is OFF, the control will not set any limit to the capacity,
and when ON, the control sets a capacity limit to the Configu-
ration
BP
DMD.L
D.L.S2 set point.
If both switches are ON, Inputs
GEN.I
DL.S2 is used
as the limiter of capacity.
Under Configuration
IAQ
SW.LG, set the logic state
appropriately for the action desired. Set the DL1.L and DL2.L
configurations. They can be set normally open or normally
closed. For example, if DL1.L is set to OPEN, the user will
need to close the switch to cause the control to limit capacity to
the demand limit 1 set point. Likewise, if DL1.L is set to CLSE
(closed), the user will need to open the switch to cause the con-
trol to limit capacity to the demand limit 1 set point.
DEMAND LIMIT 4 TO 20 mA INPUT — Under Configu-
ration
BP
DMD.L, set configuration DM.L.S to 2 (2 = 4 to
20 mA control). Under the same menu, set D.L.20 to a value
from 0 to 100 to set the demand limit range. For example, with
D.L.20 set to 50, a 4 mA signal will result in no limit to the
capacity and 20 mA signal will result in a 50% reduction in
capacity.
Economizer/Outdoor Air Damper Control —
There are multiple methods for externally controlling the econ-
omizer damper.
IAQ DISCRETE INPUT CONFIGURATION — The IAQ
(indoor air quality) discrete input configuration requires a
CEM module (optional) to be installed and an interface to a
switch input at TB202-12 and TB202-13. The state of the input
on the display can be found at Inputs
AIR.Q
IAQ.I.
Before configuring the switch functionality, first determine
how the switch will be read. A closed switch can indicate either
a low IAQ condition or a high IAQ condition. This is set at
Configuration
IAQ
SW.LG
IAQ.L. The user can set
what a low reading would mean based on the type of switch be-
ing used. Setting IAQ.L to OPEN means that when the switch
is open the input will read LOW. When the switch is closed, the
input will read HIGH. Setting IAQ.L to CLSE (closed) means
that when the switch is closed the input will read LOW, and
therefore, when the switch is open the switch will read HIGH.
There are two possible configurations for the IAQ discrete
input. Select item Configuration
IAQ
AQ.CF
IQ.I.C
and configure for either 1 (IAQ Discrete) or 2 (IAQ Discrete
Override).
IQ.I.C
= 1 (IAQ Discrete) — If the user sets IQ.I.C to 1 (IAQ
Discrete), and the switch logic (Configuration
IAQ
SW.LG
IAQ.L) is set to OPEN, then an open 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 econo-
mizer will move to the IAQ Demand Vent Minimum Flow
CFM control setting.
These settings may be adjusted and are located here:
Configuration
IAQ
DCV.C
IAQ.M
Configuration
IAQ
DCV.C
O.C.MN
If the switch is closed, the IAQ reading will be high and the
economizer 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 Econo-
mizer Minimum Flow CFM control setting.
These settings may be adjusted and are located here:
Configuration
IAQ
DCV.C
EC.MN
Configuration
IAQ
DCV.C
O.C.MX
IQ.I.C
= 2 (IAQ Discrete Override) — If the user sets IQ.I.C
to 2 (IAQ Discrete Override), and Configuration
IAQ
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
IAQ
AQ.SP
IQ.O.P.
FAN CONTROL FOR THE IAQ DISCRETE INPUT —
Under Configuration
IAQ
AQ.CF, the IQ.I.F (IAQ Dis-
crete Input Fan Configuration) must also be set. There are
three configurations for IQ.I.F. Select the configuration which
will be used for fan operation. This configuration allows the
user to decide whether 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.
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 con-
figuration is at Configuration
IAQ
AQ.CF
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
position 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
AQ.SP, set IQ.O.P (IAQ Economizer
Override Position). The IQ.O.P configuration is adjustable
from 0 to 100%. These configurations are also used in conjunc-
tion with Configuration
IAQ
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 configuration 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 occupan-
cy the fan will start.
If IQ.A.F is configured to request the supply fan, then
configurations D.F.ON and D.F.OF need to be set. These
configuration settings are located under Configuration
IAQ
AQ.SP and configure the fan override operation based
on the differential air quality (DAQ). If DAQ rises above
D.F.ON, the control will request the fan on until DAQ falls be-
low D.F.OF.
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 unoccu-
pied modes
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
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