KMC Controls CSP-5002 - Manual (Page 5)

CSP-5001/5002 VAV Flow Controller-Actuators 5 Applications Guide, Rev. B
System Troubleshooting
The following troubleshooting guide is directed
towards single duct cooling applications, the same
concepts can be applied to other configurations.
1. Verify 24 volts AC at terminals “~” (phase) and
“–” (ground). Tolerance can be –15% to +20%
(20.4 to 28.8 volts AC)
NOTE: When using the same transformer for more
than one control, the phase and ground
must be consistent with each device.
2. Verify 16 volts DC at terminals “(16 VDC)” and
“(–)”. Tolerance is 15.0 to 17.0 volts DC, power
supply to thermostat. If not correct, disconnect
the thermostat and recheck. If still incorrect,
replace the CSP controller.
3. Check “Requested Flow” voltage on the “IN” and
“–” terminals. Use the Typical Voltage/Velocity
Chart to correlate the voltage with air flow.
4. Check “Actual Flow” voltage on terminal “OUT”
and “–” for (0–10 volts DC). The “IN” and “OUT”
voltages should match (within a reasonable
tolerance). If they do not, change the setpoint all
the way up or down, wait at least five minutes,
and measure again. If they still do not match,
check for the following:
Controller Testing
Test the CSP actuator’s motor operation:
1. Temporarily disconnect the thermostat reset
connection at Terminal “IN”.
2. Jumper “IN” terminal to the “16 VDC” terminal.
The green Open LED should illuminate. The
shaft drive hub should be rotating the damper
open. The damper should go to full open unless
the maximum limit was set at the CSP, and then
the damper will only go to the maximum setting.
If the damper is rotating closed, the “Close”
jumpers must be changed. Refer to the Rotation
Setup section.
3. Jumper “IN” terminal to the “–” terminal. The
red Close LED should illuminate. The shaft
drive hub should be rotating the damper closed.
The damper should go to full closed unless the
minimum limit was set at the CSP, and then the
damper will only go to the minimum setting. If
the damper is rotating open, the “Close” jumpers
must be changed. Refer to Rotation Setup section.
A. There is inadequate airflow in the duct leading
to the controller.
B. The damper may be sticking or at the end of
its travel.
C. The setscrews on the actuator shaft may be
slipping.
D. The VNOM potentiometer may have been
changed from its factory setting. See the
VNOM Range Setting section.
5. If the “Requested Flow” and “Actual Flow”
match, but the reading from a flow hood over the
duct outlet is substantially different, one of the
following may be at fault:
A. The tubing to the controller’s flow sensor
may be kinked, too long, or pulled off (fix the
tubing).
B. The flow sensor in the controller may be bad
(replace the controller).
6. Check box movement, damper rotation, etc.
A. Review “Requested Flow” and “Actual Flow”
above to determine if unit should be satisfied
(within 50 fpm) or driving open or closed.
B. If damper is not moving, verify damper is
not stuck or at end of travel. Check rotation
jumpers for proper position.
C. Change “Requested Flow “ to drive the
unit in the opposite direction. This can be
accomplished by moving the setpoint sliders
or the steps below.
CAUTION
Never jumper terminal “16 VDC” to terminal
“–” since this would cause a short and possibly
damage the power supply.
i. To manually open the box, remove wiring
from terminal “IN” and jumper terminal
“IN” to terminal “16 VDC”. This will tell
unit to control at 3300 fpm (full airflow),
the green LED should turn on, and the box
should drive open).
ii. To manually close the box, remove wir-
ing from terminal “IN”, and jumper “IN”
terminal to “–” terminal. This will tell unit
to control at zero fpm (no airflow), the red
LED should be on and the box should drive
closed.