Bryant 580J*08--14D Service And Maintenance Instructions page 57

The same equation can be used to determine the occupied
or maximum ventilation rate to the building. For example,
an output of 3.6 volts to the actuator provides a base
ventilation rate of 5% and an output of 6.7 volts provides
the maximum ventilation rate of 20% (or base plus 15 cfm
per person). Use Fig. 72 to determine the maximum
setting of the CO sensor. For example, an 1100 ppm
2
setpoint relates to a 15 cfm per person design. Use the
1100 ppm curve on Fig. 72 to find the point when the CO
sensor output will be 6.7 volts. Line up the point on the
graph with the left side of the chart to determine that the
range configuration for the CO
ppm. The EconoMi$er IV controller will output the 6.7
volts from the CO sensor to the actuator when the CO
2
concentration in the space is at 1100 ppm. The DCV
setpoint may be left at 2 volts since the CO
voltage will be ignored by the EconoMi$er IV controller
until it rises above the 3.6 volt setting of the minimum
position potentiometer.
SETTING EQUIPMENT
1
Interface w/Standard
2
Building Control System
3
4
5
Economizer
6
7
8 Health & Safety
Parking/Air Intakes/
9
Loading Docks
2
sensor should be 1800
2
2
sensor
2
Table 23 – CO Sensor Standard Settings
2
VENTILATION
OUTPUT RATE
(cfm/Person)
Proportional Any
Proportional Any
Exponential Any
Proportional 15
Proportional 20
Exponential 15
Exponential 20
Proportional —
Proportional —
Once the fully occupied damper position has been
determined, set the maximum damper demand control
ventilation potentiometer to this position. Do not set to the
maximum position as this can result in over-ventilation to
the space and potential high humidity levels.
CO Sensor Configuration
2
The CO sensor has preset standard voltage settings that
2
can be selected anytime after the sensor is powered up.
(See Table 23.)
Use setting 1 or 2 for Bryant equipment. (See Table 23.)
1. Press Clear and Mode buttons. Hold at least 5
seconds until the sensor enters the Edit mode.
2. Press Mode twice. The STDSET Menu will appear.
CO
2
ANALOG
CONTROL
OUTPUT RANGE
(ppm)
0--- 10V
0--- 2000
4--- 20mA
2--- 10V
0--- 2000
7--- 20mA
0--- 10V
0--- 2000
4--- 20mA
0--- 10V
0--- 1100
4--- 20mA
0--- 10V
0--- 900
4--- 20mA
0--- 10V
0--- 1100
4--- 20mA
0--- 10V
0--- 900
4--- 20mA
0--- 10V
0--- 9999
4--- 20mA
0--- 10V
0--- 2000
4--- 20mA
57
OPTIONAL RELAY
RELAY SETPOINT HYSTERESIS
(ppm) (ppm)
1000 50
1000 50
1100 50
1100 50
900 50
1100 50
900 50
5000 500
700 50