Dcv Menu Is Not Visible; Input Values Are Outside The Expected Range; Motion/Occupancy Sensor Does Not Work; Temperature Reading Is Incorrect - KMC Controls FlexStat BACnet Operation Manual

DCV Menu Is not Visible

• In the BAC-12xxxx/13xxxx/14xxxx models, DCV
Setup is visible only when an application with a
modulating economizer option is enabled. See
Damper Setup on page

Input Values Are Outside the Expected Range

• Check that ALL the input pull-up resistor
switches are fully latched in the correct positions.
See the Connections and Wiring section of the
relevant FlexStat Installation Guide. A single
incorrect switch position may affect multiple
inputs. All input switches must be latched in
either 10K Ohm or 0–12 VDC positions even if
no input is connected! Input switch pairs (3-4,
5-6, and 7-8) must never have both switches set
to the left or both to the right—if switch 3 is set
to the left, for example, 4 must be set to the right
(or vice versa).
• Check that the correct input type is selected on
the Inputs screen. A Type III thermistor is the
default on IN2 through IN4. See (Advanced)
Inputs on page 16.
• Check input wiring. See Wiring Issues on page
• Check connected sensors.
• Using BACstage or TotalControl, check that the
input is not configured as "Out Of Service."
• Restore the FlexStat to factory settings (see Reset-
ting the FlexStat on page
• For an external CO
allow at least 15 minutes after installation for the
reading to stabilize.

Motion/Occupancy Sensor Does Not Work

• The initial firmware (R.1.0.0.0 and earlier) did not
support this sensor within the built-in selectable
programs. Custom programming was required—
see the FlexStat Application Guide. Upgrade to the
latest firmware for built-in support.
• After an initial power-up or restart, the motion/
occupancy sensor requires about 30 seconds
before it will begin responding to motion.
• The motion/occupancy sensor initiates override
only during "off" times in the schedule. See
Schedules on page 22.
• Check that the motion sensor is enabled and
detects motion. See Motion Sensor Setup on page
8.
• Using BACstage or TotalControl, check that BI6
(occ status) is not configured as "Out Of Service."
FlexStat
7.
24) and reconfigure.
sensor connected to IN9,
2
• The FlexStat must be installed where there is a
clear view of typical traffic area (reliable range is
out to about 33 feet). Remove or move obstacles.
Reinstall the FlexStat in a more optimal location
if necessary.
• Connect remote motion sensors to an input
(requires custom programming).
• For more information on detection performance,
patterns, configuration, programming, and other
issues, see the Motion/Occupancy Sensor section
in the FlexStat Application Guide.

Temperature Reading Is Incorrect

• Check that the correct °F/°C temperature scale is
selected—see Navigation on page
• Fahrenheit decimal values are not displayed by
default but can be enabled in the User Interface
menu—see Show Temperature Tenths (Decimals)
on page 20.
• Check for the correct remote temperature sensor
configuration—see Sensor Setup on page
• After applying power for the first time (or after an
outage), allow the FlexStat to self-calibrate a few
36.
minutes before verifying temperature reading.
• If the discrepancy is small, adjust the calibration
offset—see (Advanced) Inputs on page
• Check that the thermistor (on models without
humidity sensors) is centered in its hole at the
bottom of the case and has an air gap around it.
Also check that its leads are not pinched, shorted,
or broken and that the tape holding down the
leads is not loose. (Some early models with
humidity sensors did not have the additional
thermistor—temperature was derived from the
same chip that measured humidity.)
• Using BACstage or TotalControl, check that
AI1 (space temp.) is not configured as "Out Of
Service."
• Check that the FlexStat is NOT mounted on an
exterior wall, mounted on or near a large thermal
mass (e.g., concrete block wall), blocked from
normal air circulation by obstructions, exposed
to heat sources (e.g., lights, computers, copiers,
coffee makers) or to sunlight (at any time of the
day), exposed to drafts from windows or air
vents, or exposed to air flow through the conduit
from leaks in plenum ducts (put plumber's putty
or other sealant inside conduit to block air leaks).
• See also Input Values Are Outside the Expected
Range on page

Temperature Setpoint Is Not Maintained

31
4.
31.
Operation Guide, Rev. L
9.
16.