85
and
EC.MN
as shown in Fig. 13. The relationship is a linear re-
lationship but other non-linear options can be used. The damp-
er position will never exceed the bounds specified by
IAQ.M
and
EC.MN
during IAQ control.
If the building is occupied and the indoor fan is running and the
differential between IAQ and OAQ is less than
DAQ.L
, the
economizer will remain at
IAQ.M
. The economizer will not
close completely. The damper position will be 0 when the fan
is not running or the building is unoccupied. The damper posi-
tion may exceed
EC.MN
in order to provide free cooling.
The
Comfort
Link controls are configured for air quality sensors
which provide 4 mA at 0 ppm and 20 mA at 2000 ppm. If a sensor
has a different range, these bounds must be reconfigured. These
pertinent configurations for ranging the air quality sensors are
IQ.R.L, IQ.R.H, OQ.R.L,
and
OQ.R.H
. The bounds represent the
PPM corresponding to 4 mA (low) and 20 mA (high) for IAQ and
OAQ, respectively.
If OAQ exceeds the OAQ Lockout Value (
OAQ.L
), then the
economizer will remain at
IAQ.M
. This is used to limit the use
of outside air which outdoor air CO
2
levels are above the
OAQ.L
limit. Normally a linear control of the damper vs. the
IAQ control signal can be used, but the control also supports
non-linear control. Different curves can be used based on the
Diff.IAQ Responsiveness Variable (
IAQ.R
)
. See Fig. 14.
Fig. 13 — IAQ Control
Fig. 14 — IAQ Response Curve
SETTING UP THE SYSTEM
The IAQ configuration options are under the Local Display
Mode
Configuration
IAQ
. See Table 67.
IAQ Analog Sensor Config (Configuration
IAQ
AQ.CF
IQ.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 is
Con-
figuration
IAQ
EC.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
Configuration
IAQ
AQ.SP
DAQ.H
, the econ-
omizer minimum position will be the IAQ override posi-
tion (
Configuration
IAQ
AQ.SP
IQ.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 ohms) to
EC.MN
(10,000 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 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 auto-
matic 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 (
Con-
figuration
IAQ
AQ.SP
D.F.ON
). The fan will be turned
off when DAQ is below the DAQ Fan Off Set Point (
Configu-
ration
IAQ
AQ.SP
D.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 (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) — No discrete input will be
used and the standard IAQ sensor input will be used.
•
IQ.I.C
= 1 (IAQ Discrete Input) — 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) — 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.
100
500
700
1000
IN
S
IDE/OUT
S
IDE CO
2
DIFFERENTIAL
IN
S
IDE CO
2
CONCENTRATION
AQ
DIFFERENTIAL
LOW (DAQ.L)
AQ
DIFFERENTIAL
HIGH (DAQ.H)
MINIMUM
IAQ
DAMPER
PO
S
ITION
ECONOMIZER
MINIMUM
DAMPER
PO
S
ITION
INCREA
S
ING VENTILA
TION
VENTILATION FOR PEOPLE
VENTILATION FOR
S
OURCE
S
NOTE: Calculating the IAQ.M and EC.MN damper position based on differential
IAQ measurement. Based on the configuration parameter IAQREACT, the reac-
tion 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)
Содержание Weathermaster 48P2030-100
Страница 130: ...130 Fig 19 Typical Power Schematic Sizes 040 075 Shown ...
Страница 131: ...131 Fig 20 Main Base Board Input Output Connections ...
Страница 132: ...132 Fig 21 RXB EXB CEM SCB Input Output Connections ...
Страница 133: ...133 Fig 22 Typical Gas Heat Unit Control Wiring 48P030 100 Units Shown ...
Страница 134: ...134 Fig 23 Typical Electric Heat Wiring 50P030 100 Units Shown ...
Страница 135: ...135 Fig 24 Typical Power Wiring 115 V ...
Страница 136: ...136 Fig 25 Typical Gas Heat Section Size 030 050 Units Shown ...
Страница 138: ...138 Fig 27 Component Arrangement Size 030 035 Units ...
Страница 139: ...139 Fig 28 Component Arrangement Size 040 075 Units ...
Страница 140: ...140 Fig 29 Component Arrangement Size 090 100 Units ...