Controls, Start-Up, Operation, Service and ... - Climayoreo

SETTING UP THE SYSTEM — The IAQ configuration options
are under the Local Display Mode ConfigurationIAQ.
See Table 57.
IAQ Analog Sensor Config (ConfigurationIAQ
AQ.CFIQ.A.C) — This is used to configure the type of
IAQ position control. It has the following options:
• IQ.A.C = 0 (No analog input). If there is no other minimum
position control, the economizer minimum position
will be ConfigurationIAQEC.MN and there will be
no IAQ control.
• IQ.A.C = 1 (IAQ analog input). An indoor air (space or
return air) CO 2 sensor is installed. If an outdoor air CO 2
sensor is also installed, or OAQ is broadcast on the CCN,
or if a default OAQ value is used, then the unit can perform
IAQ control.
• IQ.A.C = 2 (IAQ analog input with minimum position
override) — If the differential between IAQ and OAQ
is above ConfigurationIAQAQ.SPDAQ.H, the
economizer minimum position will be the IAQ override
position (ConfigurationIAQAQ.SPIQ.O.P).
• IQ.A.C = 3 (4 to 20 mA minimum position) — With a 4
to 20 mA signal connected to TB201 terminal 7 and 8,
the economizer minimum position will be scaled linearly
from 0% (4 mA) to EC.MN (20 mA).
• IQ.A.C = 4 (10K potentiometer minimum position) — With
a 10K linear potentiometer connected to TB201 terminal 7
and 8, the economizer minimum position will be scaled linearly
from 0% (0 kilo-ohms) to EC.MN (10 kilo-ohms).
IAQ Analog Fan Config (ConfigurationIAQAQ.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 following
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).
• 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 unoccupied
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 (ConfigurationIAQAQ.SPD.F.ON). The fan
will be turned off when DAQ is below the DAQ Fan Off Set
Point (ConfigurationIAQAQ.SPD.F.OF). The control
can also be set up to respond to a discrete IAQ input.
The discrete input is connected to TB202 terminal 12 and
13.
IAQ Discrete Input Config (ConfigurationIAQAQ.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
IAQDCV.CIAQ.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.P.O (when high).
It is also necessary to configure how the fan operates when
using the IAQ discrete input.
76
ECONOMIZER
MINIMUM
DAMPER
POSITION
MINIMUM
IAQ
DAMPER
POSITION
INCREASING VENTILATION
VENTILATION FOR PEOPLE
VENTILATION FOR SOURCES
100
500
AQ
DIFFERENTIAL
LOW (DAQ.L)
700
1000
AQ
DIFFERENTIAL
HIGH (DAQ.H)
Fig. 13 — IAQ Control
INSIDE/OUTSIDE CO 2 DIFFERENTIAL
INSIDE CO 2 CONCENTRATION
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. 14 — IAQ Response Curve
IAQ Discrete Fan Config (ConfigurationIAQAQ.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.