Temperature Reading Is Incorrect; Temperature Setpoint Is Not Maintained; Output, Fan, And Relay Issues; Analog Output Does Not Work - KMC Controls FlexStat Operation Manual

• 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 (Advanced) User Interface (UI)
Modes on page 9.
• After applying power for the first time (or after
an outage), allow the FlexStat to self-calibrate a
few minutes before verifying temperature read-
ing.
• If the discrepancy is small, adjust the calibration
offset—see (Advanced) Inputs on page
• Check that the thermistor 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 addi-
tional 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
inside conduit to block air leaks).
• See also Input Values Are Outside the Expected
Range on page 22.

Temperature Setpoint Is Not Maintained

• Select Occupied mode from the Home Menu—
see H/C, Fan, Occupancy, and Override on page
• Override the fan to On from the Home Menu—
see H/C, Fan, Occupancy, and Override on page
• Check that the appropriate application is se-
lected—see (Advanced) Application Options on
page 6.
• Check that room temperature is being sensed
correctly—see Temperature Reading Is Incorrect
on page 23.
FlexStat

Output, Fan, and Relay Issues

Analog Output Does Not Work

CAUTION
Do not mistakenly connect 24 VAC to an analog
output ground. This is not the same as a relay's
switched common. See the backplate's terminal
label for the correct terminal.
NOTE: The maximum current of an analog output
9.
• Check current draw of load—it must be 20 mA or
less. Substitute an output device that draws less
current.
• Check that the output is on.
• See Wiring Issues on page
• See also Fan Does Not Run on page
• If Restore Factory has just been performed, see
the Note and Cautions in Restore Factory on
page 17.
• If the firmware has just been upgraded, firm-
ware for the wrong model type may have been
installed (e.g., BAC-1xx63 firmware accidentally
installed in a model BAC-1xx36). In the About
menu, ASV may simply read "CUSTOM" instead
of something like "BAC_1xx36 R1.1.0.5" as it
normally would have done. If so, repeat the firm-
ware upgrade and ensure that the correct type of
firmware is selected for the connected model.
NOTE: ASV in the About menu will also show
4.
4.
23
is 20 mA @ 12 VDC. Excessive loads will
be clamped at the maximum. Relays may
chatter or fail to latch if they need more
current than the maximum allowed. KMC
REE-3111/3112 relays, for example, could be
connected to the analog outputs, but REE-
3211/3221/3213 relays would not operate
reliably with analog outputs because their
required power exceeds the FlexStat's
capacity. (REE-3211/3221/3213 relays could,
however, be used with the FlexStat relays
and a separate power source.)
26.
CUSTOM if any built-in Control Basic
program (1–5) is not running or has auto-
run disabled.
24.
Operation Guide, Rev. K