Device Bus Number; Device Access Security Level; Sensors; Bypass Damper Duct Temperature - Carrier 33CS Installation, Service And Instructions

Device Bus Number

munication buses connected in a single system. There is one
primary bus and there can be 239 secondary buses attached
to the primary bus. The primary bus address is always 0.
Each secondary bus has a device address. When the bypass
controller resides on a secondary bus, the bus address must
be entered into the Device Bus Number configuration. The
default is 0. Acceptable values range from 0 to 239. The De-
vice Bus Number is set in category 8, option 3.
The primary network device bus number is always 0. Sec-
ondary network buses can be added by using a network bridge
module. This secondary bus has a bus number equal to the
device address of the bridge module. Any devices (monitor,
zone controller, bypass controller) on this secondary bus must
have their device bus number set equal to the device address
of the bridge module.

Device Access Security Level

cess security level is used to limit access to the bypass con-
troller functions by unauthorized personnel. The access se-
curity level is configured in category 8, option 2. The factory
setting is 1. The range of acceptable access security levels is
1 to 4.
Access security level 1 allows full programming of the
bypass controller. Security levels 2, 3, and 4 allow no pro-
gramming.
Do not leave access security level option at 1 after con-
figuration is complete. Untrained or unauthorized users
may change set points or other important information.
If the access security level is changed to 2, 3, or 4, the
access security level cannot be changed back in the normal
method because programming is not allowed. To reconfig-
ure the access security level of the bypass controller, acti-
vate the information display (simultaneously press both left
or right information buttons). When the information display
shows the security level (display number 3), press any but-
ton to freeze the display. Then press both upper or both lower
information buttons to enter the programming mode. Recon-
figure category 8, option 2 to the desired access security level.

SENSORS

This section describes those functions that relate to the
different sensors that can be interfaced to the bypass con-
troller. The bypass controller utilizes information from the
following sensors to operate the bypass damper and control
system static pressure: zone temperature sensor, IAQ sensor,
duct temperature sensor, and system pressure sensor.
When necessary, sensor calibration can be performed at
the bypass controller.
Bypass Damper Duct Temperature Sensor
The bypass controller measures duct temperature at the by-
pass damper through a solid state temperature sensor from
30 to 180 F (in 0.1° F increments) and up to 500 ft from the
bypass controller. The bypass damper duct temperature sen-
sor is connected to the printed circuit board in the bypass
damper actuator. No wiring is required. See Fig. 9.
DUCT TEMPERATURE SENSOR CALIBRATION – The
Duct Temperature Sensor Calibration function allows the user
to calibrate the sensor. The factory setting is computer
calibrated. The range of values is 30 to 180 F in 0.1° F
increments.
— There can be different com-
— The device ac-
To access the Duct Temperature Sensor Calibration func-
tion, set category 5, option 4. The current duct temperature
is displayed. Use the left upper and lower information
buttons to raise or lower the calibration value to the desired
setting.

Pressure Sensor

sure in its system through a pressure sensor.
PRESSURE SENSOR RE-ZERO — To assure that the by-
pass controller is able to maintain proper static pressure lev-
els during normal operation, the bypass controller will au-
tomatically re-zero when the Auto-Zero Enable option is
selected.
To auto-zero the pressure sensor, select category 5,
option 6 (Auto-Zero Enable). Set the option to ON. The by-
pass controller will turn off the system fan and allow time
for the pressure to settle. If a Fan-Off Delay has been pro-
grammed into the bypass controller, this time period must
expire before the sensor can be zeroed. Once this time pe-
riod expires, the bypass controller will automatically zero
the pressure sensor and reset the option to OFF.
PRESSURE SENSOR CALIBRATION — To calibrate the
pressure sensor manually, select category 5, option 8. The
current pressure reading will be displayed on the bypass con-
troller screen. Compare the pressure reading to the pressure
measured by a Magnehelic gage or manometer. Use the left
information buttons to adjust the value until the desired pres-
sure is shown.

Zone Temperature Monitoring

troller can use sensors to monitor the temperature in the zone.
The zone controller can do one of the following:
• use the local zone temperature sensor for temperature
information
• use its remote room sensor(s) (field installed) for tempera-
ture information
• average the temperatures it receives from its local room
temperature and remote room sensors for temperature
information.
To configure the room sensor, set category 5, option 1.
When the Room Sensor option is set to 1, the bypass con-
troller will use the local zone temperature sensor for tem-
perature information. When the Room Sensor option is set
to 2, the bypass controller uses its remote room sensor(s)
(field installed) for temperature information. When the Room
Sensor option is set to 3, the bypass controller averages the
temperatures it receives from its local room temperature and
remote room sensors for temperature information.

Zone Temperature Sensor

can measure zone temperature through a solid-state tem-
perature sensor which is field-installed in the zone where the
bypass controller is located. See Fig. 10. The sensor has a
range of 30 to 180 F with 1/10 degree resolution.
—
ZONE TEMPERATURE SENSOR CALIBRATION — To
calibrate the zone temperature sensor, configure category 5,
option 2. The temperature reading of the sensor will be dis-
played. Compare the reading to an accurate thermometer. Use
the left upper or lower information buttons to raise or lower
the temperature reading (by tenths of a degree) until the de-
sired calibrated temperature is shown. The range of possible
temperatures is 30 to 180 F.
11
— The bypass controller measures pres-
— The bypass con-
— The bypass controller