KMC Controls CSC-3000 User Manual

Pneumatic VAV Reset Volume Controllers

CSC-3000 Series*

Installation Guide

Mounting

CSC-3000 series controllers are position sensitive and must be mounted and calibrated in either the horizontal or vertical plane.

1. As near to the ow sensor pickup as is feasible, connect the mounting bracket to the mounting surface with two self-threading screws in the two 3/16" (5 mm) mounting holes. Be sure to leave enough room to make connections.

2. Insert the controller, face down, up, right or le. The controller must be installed and adjusted in the same plane or readjustment will be necessary.

All adjustments are CCW to increase

*(These instructions do not apply to the CSC-3014 or the

CSC-3501/3505; see their separate Installation Guides.)

Connections

Magnehelic gauge and 0–30 psi gauge in illustration added for checkout and calibration purposes

Typical CSC-3011 Application and Connections

For adjusting start point and span (upper and lower knobs) see the Application Guide

All dimensions are in inches (mm)

CAUTION

Pneumatic devices must be supplied with clean, dry control air. Any other medium (e.g., oil or moisture contamination) will cause the device to fail.

For all models of the CSC-3000 series, use 1/4" (5 mm) O.D. “FR” tubing on the following push-on ings:

1. Connect the clean, dry, oil-free main air supply to Port “M” (15 to 30 psi).

2. Connect the damper actuator to Port “B”.

3. Connect the thermostat output to Port “T”.

4. Connect the high pressure tap on the air ow sensor to Port “H”.

5. Connect the low pressure tap on the air ow sensor to Port “L”.

6. Check for proper connections. Make sure all tubes are snug on their ings. If loose, trim the end of the tubing and reconnect it to ensure there are no leaks.

NOTE: Over time, the tube may stretch or develop

microcracks. Trim the end of tube back to undamaged material and reconnect. Replace the tubing if it is brile or discolored.

NOTE: You can easily test for leaks with a squeeze

bulb to ensure there are no leaks at the actuator diaphragm or ings.

7. Use a ow hood or “tee” a Magnehelic® (or equivalent)

dierential pressure gauge between the controller and the ∆P pick-up to determine ow rates.

CSC-3000 Series 1 Installation Guide

Adjustments and Calibration

NOTE: Do NOT adjust start point and span (upper and

lower knobs) without thoroughly reviewing the Application Guide. For information about direct vs. reverse reset, see the Application Guide.

Damper Action

REVERSE Reset Minimum and Maximum

Max. Airflow

Reset Start Point

• 3 psig: CSC-3021/3026

• 8 psig: CSC-3011/3016/3017/3025

• 10 psig: CSC-3023

Reset Span (5 psig)

(Cooling w/ RA Thermstat or

Heating w/ DA Thermostat)

Min. Airflow

The damper action is factory-set at Normally Open (NO). To change to Normally Closed (NC):

1. Loosen the damper selection screw.

2. Turn the selection dial clockwise until the “NC” arrow aligns with the “DAMPER” arrow.

NOTE: Accuracy in the alignment of the arrows is

very important. Make this adjustment as exact as possible.

3. Tighten the selection screw. Be sure the screw is tight (2 to 4 in-lbs. of torque), but if overtightened, the

plastic will strip out.

Adjusting Minimums and Maximums

When adjusting the minimum and maximum ow seings, the output responds slowly to changes in the setpoint. Wait for the ow rate to stabilize aer making an adjustment (usually 20 to 30 seconds) before making further adjustments. Also, if the damper position is all the way closed or open when starting this step, turn the adjustment one full turn, and then wait 20 to 30 seconds for a change in the ow reading of the Magnehelic gauge. If no change occurs aer this time, repeat until the ow rate changes. (See the Application Guide for more tips.)

DIRECT Reset Minimum and Maximum

Reset Start Point

• 3 psig: CSC-3021/3026

• 8 psig: CSC-3011/3016/3017/3025

• 10 psig: CSC-3023

Min. Airflow

NOTE: The direct reset illustration above assumes no

relays between the thermostat and “T” port.

For Direct Reset (DA thermostat for cooling or RA thermostat for heating), perform the following steps:

1. Disconnect the “T” port. Temporarily plug the tubing. (Do NOT plug the port.)

2. Adjust the LO STAT ∆P (center dial) to the desired Minimum airow.

3. Reconnect the tubing at “T” port.

4. Adjust thermostat to call for full airow (15 psi or more at “T” port).

5. Adjust the HI STAT ∆P (dial on right) to the desired Maximum airow.

6. Repeat Steps 1 through 5 to verify the seings.

Reset Span (5 psig)

Max. Airflow

(Cooling w/ DA Thermstat or

Heating w/ RA Thermostat)

Thermostat Pressure

NOTE: The reverse reset illustration above assumes no

relays between the thermostat and “T” port.

For Reverse Reset (RA thermostat for cooling or DA thermostat for heating), perform the following steps:

1. Disconnect the “T” port and leave it open. Temporarily plug the open tubing.

2. Adjust the LO STAT ∆P (center dial) to the desired Maximum airow.

3. Reconnect the tubing at port “T”.

4. Adjust the thermostat to call for minimum airow (15 psi or more at “T” port).

5. Adjust the HI STAT ∆P (dial on the right) to the desired Minimum airow.

6. Repeat Steps 1 through 5 to verify the seings.

More Information

For specications, see the Data Sheet for these controllers. For additional adjust-

ments, calibration, troubleshooting, principles of operation, and sample applications, see the Application Guide for

these controllers. For support documents, see the CSC-3000 series product page (bit.ly/y0G2sI) on the KMC Controls web site (kmccontrols.com).

This Installation Guide does not apply to the CSC-3014 (designed to work with CTC-2100 Thermostats) or the CSC-3501/3505 (Linear Volume Reset Controllers). See their separate Data Sheets and Installation Guides.

Important Notices

The material in this document is for information purposes only. The contents and the product it describes are subject to change without notice. KMC Controls, Inc. makes no representations or warranties with respect to this document. In no event shall KMC Controls, Inc. be liable for any damages, direct or incidental, arising out of or related to the use of this document.

KMC Controls, Inc.

19476 Industrial Drive

New Paris, IN 46553

574.831.5250

www.kmccontrols.com; info@kmccontrols.com

CSC-3000 Series 2 Installation Guide