Lennox CS User Manual

USER'S GUIDE

©2014 Lennox Industries Inc.

Dallas, Texas, USA

RETAIN THESE INSTRUCTIONS

FOR FUTURE REFERENCE

Adjust Temperature - Quick Reference

Comfort Sensor (CS) and
Comfort Sensor Zoning
(CSZ)

CONTROLS

505218M
7/2014
Supersedes 11/2010

Heating Setpoint
(adjustable when flashing)

Litho U.S.A.

Press to
increase
the set
point.

Press to
lower the
setpoint

See figure 1 to adjust the heating and cooling setpoints. If
the setpoints are not displayed, press any button.

General

The Comfort Sensor (CS) and Comfort Sensor-Zoning
(CSZ) are temperature sensors which will communicate
with the L Connection network. In addition, the CSZ is used
as a zone controller. Both CS and CSZ are available with
humidity and CO2 sensing options.

Features:

Adjustable temperature setpoints
Resume program operation
Change the occupancy status

The CSZ will communicate on the ZoneBus to a Zone Link
control. The Zone Link will control rooftop unit heating,
cooling, and ventilation for all of the zones on the ZoneBus.

Display

The following readings will be displayed on start-up.

Zone temperature
Unit status (if unit is operating)
Occupied (if unit is in occupied mode)

To display additional information, M1/M2 electronic
configure to order (ECTO) or M3 parameter settings may
be adjusted. See the installation instructions provided with
each sensor.

Refer to the following steps and the appropriate number in
figure 2 for a description of each readout.

Press to
heat or cool

Cooling Setpoint (adjust
able when flashing)

Note - CS/CSZ may be set to prevent adjustment. The setpoint
range may also be limited. Check with the building manager or
maintenance personnel if setpoints won't change.

Press to change
to other setpoint.

after hours.

Figure 1. Change Setpoints

1. Cooling Setpoint or Damper Position. When the ECTO
or M3 Parameter is set to display the damper position,
any button may be pushed to display the setpoints.
Damper position is available for use with CSZ sensors
only.

2. Heating Setpoint or Relative Humidity. When the
ECTO or Parameter is set to display the relative
humidity, any button may be pushed to display the
setpoints. CS/CSZ must be equipped with RH option
to display RH.

3. Resume Program. Displayed when override mode is
returning to a scheduled program.

4. Override Mode. Displayed when a scheduled program
has been overridden. Also referred to as After Hours
Override.

5. Zone temperature.

6. Operation Status. Either HEAT or COOL will be
displayed when the zone is operating in heating or
cooling mode. The appropriate readout will blink if the
zone is requesting either heating or cooling and the
zone is not yet being serviced.

2 Heating Setpoint or

Relative Humidity

4 Override Mode3 Resume Program

5 Zone Temperature (high resolution shown)

6 Operation Status

7 Degrees F or C

1 Cooling Setpoint or

Zone Damper
Position (CSZ only)

10 Fan Status (CS only) 9 Displayed during occupied time period

Figure 2. Display description

7. Degrees Fahrenheit (F) or Celsius (C).

. CO

8. Outdoor Temperature or CO

2

level shown in

2

parts per million. The CS/CSZ must be equipped with
CO2 option to display CO2.

9. Occupied Status. Displayed when the zone is in
occupied mode. Nothing is displayed in this area
during the unoccupied time period.

10. Fan Status. CS only. If enabled, the unit fan control
status is displayed, either FAN ON (continuous) or
FAN AUTO (cycles with heating or cooling operation).
Refer to the CS instructions to enable fan status.

Change Heating and Cooling Setpoints

Use the following steps and figure 3 to change setpoints.

1. Press either arrow button. The setpoint for the
currently operating mode will blink.

2. Use the arrow buttons to change the setpoint for the
currently operating mode.

3. Press the select button to change to the other setpoint.
Use the arrow buttons to change the other setpoint.

4. Press the select button for 1 second to enter the new
setpoints. New setpoints will also be entered if no
buttons are pressed for 4 seconds.

Heating
Setpoint

Cooling
Setpoint

Select
Button

Note - CS/CSZ may be set up to limit the range of setpoint
adjustment or disable setpoint adjustment.

Figure 3. Change Setpoints

Press to
increase
the
setpoint.

Press to
lower
the
setpoint

8 Outdoor Temperature or CO

level

2

Override / Occupancy Status

Initiating Override

Press the button on the right side of the CS/CSZ to
override the Network Control Panel (NCP) scheduled
program for that zone. See figure 4. The zone setpoint will
change to the override values.

OVERRIDE
BUTTON

PRESS TO OVERRIDE THE SCHEDULED PROGRAM

Figure 4. Occupancy Override

The scheduled program can also be overridden by
changing the setpoints using the buttons on the CS/CSZ.
See previous section. The new setpoints will be used for
the override period (default 2 hours). At the end of the
override period setpoints will return to the scheduled
program values.

Length of Override

The override period is determined by:

The NCP (when installed)
The Zone Link (CSZ installed but no NCP)
Unit Controller (CS installed but no NCP)

Manual Mode

In manual mode the override button toggles between
occupied and unoccupied mode for that zone. The
occupied time period does not apply. Manual mode occurs
when:

The NCP is set to MANUAL
A CS is on a network without an NCP or ZL

Resume Occupied Setpoints

To discontinue the override period:

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