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Bryant DURAPACK 558F User Manual

Page 30

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30

CO

2

Sensor Configuration

The CO

2

sensor has preset standard voltage settings that

can be selected anytime after the sensor is powered up. See
Table 5.

Use setting 1 or 2 for Bryant equipment. See Table 5.

1. Press Clear and Mode buttons. Hold at least 5 sec-

onds until the sensor enters the Edit mode.

2. Press Mode twice. The STDSET Menu will appear.

3. Use the Up/Down button to select the preset number.

See Table 5.

4. Press Enter to lock in the selection.

5. Press Mode to exit and resume normal operation.

The custom settings of the CO

2

sensor can be changed any-

time after the sensor is energized. Follow the steps below to
change the non-standard settings:

1. Press Clear and Mode buttons. Hold at least 5 sec-

onds until the sensor enters the Edit mode.

2. Press Mode twice. The STDSET Menu will appear.

3. Use the Up/Down button to toggle to the NONSTD

menu and press Enter.

4. Use the Up/Down button to toggle through each of

the nine variables, starting with Altitude, until the
desired setting is reached.

5. Press Mode to move through the variables.

6. Press Enter to lock in the selection, then press Mode

to continue to the next variable.

Dehumidification of Fresh Air with DCV Control

Information from ASHRAE indicates that the largest humid-
ity load on any zone is the fresh air introduced. For some
applications, a device such as an energy recovery unit is
added to reduce the moisture content of the fresh air being
brought into the building when the enthalpy is high. In most
cases, the normal heating and cooling processes are more
than adequate to remove the humidity loads for most com-
mercial applications.

If normal rooftop heating and cooling operation is not ade-
quate for the outdoor humidity level, an energy recovery unit
and/or a dehumidification option should be considered.

Table 5 — CO

2

Sensor Standard Settings

LEGEND

ppm — Parts Per Million

SETTING

EQUIPMENT

OUTPUT

VENTILATION

RATE

(cfm/Person)

ANALOG

OUTPUT

CO

2

CONTROL RANGE

(ppm)

OPTIONAL

RELAY SETPOINT

(ppm)

RELAY

HYSTERESIS

(ppm)

1

Interface w/Standard
Building Control System

Proportional

Any

0-10V

4-20 mA

0-2000

1000

50

2

Proportional

Any

2-10V

7-20 mA

0-2000

1000

50

3

Exponential

Any

0-10V

4-20 mA

0-2000

1100

50

4

Economizer

Proportional

15

0-10V

4-20 mA

0-1100

1100

50

5

Proportional

20

0-10V

4-20 mA

0- 900

900

50

6

Exponential

15

0-10V

4-20 mA

0-1100

1100

50

7

Exponential

20

0-10V

4-20 mA

0- 900

900

50

8

Health & Safety

Proportional

0-10V

4-20 mA

0-9999

5000

500

9

Parking/Air Intakes/
Loading Docks

Proportional

0-10V

4-20 mA

0-2000

700

50