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-20
-29
-10
-23
0
-18
10
-12
20
-7
30
-1
40
4
50
10
60
16
70
21
80
27
90
32
100
38
0
10
30
40
50
60
70
80
90
100
20
OUTDOOR AIR TEMPERATURE
0
10
30
40
50
60
70
80
90
100
20
MIXED AND RETURN AIR TEMPERATURE
CALCULATE MINIMUM FRESH AIR PERCENTAGE
A
BC
F
C
F
C
-20
-29
-10
-23
0
-18
10
-12
20
-7
30
-1
40
4
50
10
60
16
70
21
80
27
90
32
100
38
F
C
F
C
Adjust settings when an optional IAQ sensor is installed.
The DCV SET potentiometer is factory-set at approxi-
the IAQ sensor reads approximately 1000ppm. Adjust the
DCV SET potentiometer to the approximate setting speci-
The DCV MAX potentiometer is factory-set at approxi-
-
ers will open approximately half way when CO2 rises
above setpoint.
Adjust the DCV MAX potentiometer to the approximate
20.
Note - DCV Max must be set higher than economizer min-
imum position setting for proper demand control ventila-
tion.
Economizer Operation
The occupied time period is determined by the thermostat
or energy management system.
Outdoor Air Not Suitable:
During the unoccupied time period dampers are closed.
During the occupied time period a cooling demand will
open dampers to minimum position and mechanical cool-
ing functions normally.
During the occupied time period dampers will open to DCV
Outdoor Air Suitable:
See table 10 for economizer operation with a standard
two-stage thermostat.
MAX may override damper free cooling position when oc-
cupancy is high and outdoor air temperatures are low. If
dampers will move to minimum position until discharge air
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