KMC Controls CTE-5202 Application Guide

General Information (All Applications) 10 CTE-5202 Applications Guide, AN0912A Rev. D
CTE-5202 Troubleshooting
Display Is Blank
• If the display comes on for no more than 30
seconds after a buon is pushed and then blanks
out, Display Blanking is enabled in the SYS-
TEM menu. See Change Conguration on page 6.
• Check for a tripped circuit breaker to the trans-
former.
• Check for proper supply voltage from the
transformer and that the transformer has enough
capacity (VA) for all connected devices See their
respective data sheets and Tips for Connecting
24-Volt Power Application Note (AN0604D).
Setpoint Is Not Maintained
• Check that room temperature is being sensed
correctly. See Temperature Reading Is Incorrect
on page 10.
• Check that the appropriate sequence is selected
in the SYSTEM menu. See Change Congura-
tion on page 6 and the relevant sample applica-
tion.
• If changeover is used on AI1, check the sensor
and the changeover seing in the ADVANCE
menu. If a resistor is used on AI1 to force a
changeover without a temperature sensor, the
value of the resistor may be too high or too
low. See External Input (AI1) on page 5, Change
Conguration on page 6, and the relevant sample
application.
• If a setback switch/relay is used on AI1, the
switch may be (stuck) in the setback position. See
page 36.
• If an override switch/relay is used on AO1, the
switch may be (stuck) in the override position.
See page 18, page 34, and page 46.
• Check seings of auxiliary ow and other limits
as relevant in the LIMITS menu. See Change
Conguration on page 6.
• If the HVAC system has trouble recovering from
the unoccupied setback to the occupied setpoint
during very cold weather, adjust the setback in
the ADVANCE menu. See Change Congura-
tion on page 6.
• If space temperature is overshooting the setpoint
or oscillating, try increasing the proportional
band by a degree in the ADVANCE menu. If
the problem persists, try increasing the integral
value slightly (up to 20%). If the problem still
persists, try seing the integral value to 0. (The
optimal integral value is dependent on the
characteristics of the particular space and HVAC
system.) See Change Conguration on page 6.
Temperature Reading Is Incorrect
• Check that the correct °F/C temperature scale
is selected in the SYSTEM menu. See Change
Conguration on page 6.
• If the discrepancy is small, adjust the room
temperature oset in the ADVANCE menu. See
Change Conguration on page 6.
• Check that the thermostat 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, coee makers) or to sunlight (at any
time of the day), exposed to drafts from win-
dows or air vents, or exposed to air ow through
the conduit from leaks in plenum ducts (put
plumber’s puy or other sealant inside conduit
to block air leaks).
Wiring Issues
• Check for correct wiring for the application. See
Connections on page 5 and the various applica-
tion examples in this document.
• Remove the thermostat from the backplate and
inspect the terminals for loose wires. See the
CTE-5202 Installation Guide.
• Check the wiring at the connected devices.
• Use a voltmeter and ohmmeter to check the
terminals for expected values.
NOTE: Wiring must be adequate to avoid
excessive voltage drop on long
runs! Allow plenty of “cushion” in
measurements A meter may be too slow
to register transient dips or peaks during
startup.

KMC Controls CTE-5202 Specifications

General

Brand	KMC Controls
Model	CTE-5202
Category	Thermostat
Language	English