KMC Controls CSC-2000 User Manual

Installation Guide

CSC-2000 Series Overview

Reset Volume Controllers

CSC-2000 Series

The CSC-2000s are dierential-pressure (∆P), sub­master controllers with adjustable minimum and
maximum airow seings. A master controller,
typically a room thermostat, resets the CSC velocity
setpoint.

CSC-2000s are available as direct acting for normally
open VAV terminal units, and reverse acting for nor­mal closed VAV terminal units. Each unit is equipped
with separate adjustment knobs for minimum and
maximum airow seings. CSC-2001/2002s are
equipped with 0–10 reference dials, while all others
have blind adjustments. Calibrate all models using
standard airow measuring equipment.

The spring range of the actuator does not maer
to the controller. However, sucient main air is
required to provide the actuator with enough force
to operate the damper/linkage.

Any sequencing with other controllers, valves, or
pneumatic-electric relays must be sequenced with
the controller’s reset range, not the actuator’s spring
range.

These controllers are typically used on single-duct
applications but may be found in dual-duct appli­cations. When working on dual-duct applications
it may be necessary to work on one duct at a time
while closing o the other.

The CSC-2000 series controllers are position sensi­tive. See the Mounting section on the next page for

the proper vertical/horizontal orientation for the dif­ferent models.

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.

Connections Adjustments

CSC-2000 Series Reset Volume Controllers 1 Installation Guide

Specifications

Mounting

Output Sensitivity 0 to 1" range unit,

5 psig/0.02" wg (35 kPa/5 Pa)

0 to 2" range units,

5 psig/0.04"wg (35 kPa/10 Pa)

Main Air Pressure 15 to 30 psig (103 to 207 kPa)

Max. Signal Pressure 6" wg (1493 Pa) applied to

either port (X or Y)

Material Flame retardant plastic (beige

or gray)

Output Capability 0 to supply pressure

Weight 7.5 oz. (213 grams)

Temperature Limits

Operating 40° to 120° F (4° to 49° C)

Shipping –40° to 140° F (–40° to 60° C)

Direct Acting BEIGE units (CSC-2001/2003/2007/
2009/2017) are designed for normally open dampers

with direct-acting thermostats for cooling and re­verse-acting thermostats for heating.

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

The CSC-2000 series are position sensitive:

• The minimum and maximum ow limits must
be set (calibrated) in the same position the
controller will be mounted.

• The CSC-2001/2002 (with 0–10 molded plastic
dials) must be mounted horizontally with dial
adjustment knobs facing up.

• The CSC-2003 through CSC-2018 (no molded
dials) may be mounted horizontally (preferred),
with the adjustment knobs up or down, or
mounted vertically (the diaphragm inside must

be in a horizontal or vertical plane).

NOTE: If replacing a CSC-2001-22 or CSC-2002-22

(designed for vertical mount and now
obsolete), use the CSC-2001 or CSC-2002 as
appropriate and mount dials face up or use
the CSC-2003 or CSC-2004 as appropriate
and mount vertically or horizontally.

Reverse Acting GRAY units (CSC-2002/2004/2008/
2010/2018) are designed for normally closed damp-

ers with reverse-acting thermostats for cooling and
direct-acting thermostats for heating.

For additional specications of particular models,
see the CSC-2000 Data Sheet.

Horizontal Mount, Knobs Up Only

With 0–10 Molded Plastic Dial

(CSC-2001/2002)

Without

Molded Dial

(CSC-2003

through CSC-

2018)

Horizontal Mount

(Preferred, Knobs Up or Down)

CSC-2000 Series Reset Volume Controllers 2 Installation Guide

Or Vertical Mount

Connections

Adjustments and Calibration

All Units

For all models of the CSC-2000 Series use 1/4 in. (6
mm) O.D. “FR” tubing for the following connections:

1. Connect the main air supply to port “M”.

2. Connect the actuator to port “B”.

3. Connect the thermostat to port “T”.

Beige Units

Use 3/8 in. O.D. “FR” tubing with a maximum

length of 24 in. to connect:

1. High pressure to port “X”.

2. Low pressure to port “Y”.

Gray Units

Use 3/8 in. O.D. “FR” tubing with a maximum

length of 24 in. to connect:

1. Low pressure to port “X”.

2. High pressure to port “Y”.

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.

Troubleshooting

The CSC-2000 series are position sensitive. Be sure
to mount the controller with the correct orientation.

See the Mounting section.

NOTE: If the controller is calibrated in a position

other than the nal mounting position, the
calibration (minimum and maximum ow
limits) will be o.

To minimize issues related to pressure, always use
3/8 in. tubing for the “X” and “Y” ports and keep
the tubing lengths as short as possible. If the sen­sor has 1/4 in. ings, use 3/8 in. tubing and adapt­ers at the sensor.

Some older style ow sensors may have restrictive
openings for the low pressure pickup. Replacement
of the ow sensor pickup may be necessary.

For additional troubleshooting information, see the

CSC-2000 Applications Guide.

GRAY Controllers (Reverse Acting)

1. Check that there is 0 psi at the “T” Port.

®

2. Use a ow hood or “tee” a Magnehelic
equivalent) dierential pressure gauge between
the controller and the ∆P pick-up.

3. The “HI” ow seing limit (center knob) must
be set rst. Temporarily adjust the thermostat
for a branch pressure lower than the 3 psig reset
start point (maximum cooling); typically 1 psig or
less is best. Removing the thermostat branch line
would be another acceptable method. Adjust the
“HI” knob (center knob) counterclockwise to in­crease or clockwise to decrease ∆P limit. Normally
one-half turn will cause a 0.1 ∆P change. Allow
for reaction time. Depending on actuator size and
position, timing will vary. To position an actua­tor/damper from closed to open may take several
minutes.

4. The “LO” ow seing limit must be set aer the
“HI”. Temporarily adjust the thermostat for a
branch pressure higher than the 8 psig reset stop
point (minimum cooling); typically 12 psig or
greater is best. Removing the thermostat branch
line and teeing-in to the main air line would be
another acceptable method. Adjust the “LO” knob
(outside knob) counterclockwise to increase or
clockwise to decrease ∆P limit. Normally one-half
turn will cause a 0.1 ∆P change. Allow for reaction
time.

5. Recheck the “HI” and the “LO” seings at least
twice, verify seings, and ne tune each time if
necessary. This procedure will remove internal
component tensions and conrm seings.

6. Reconnect the thermostat branch line if necessary,
and adjust the thermostat to the desired room
temperature setpoint.

NOTE

NOTE

NOTE: For principles of operation and sample

: The “LO” adjustment limits the travel of

the reset mechanism. Therefore, the reset
span will be less than 5 psig, the upper limit
being less than 8 psig.

: Always make adjustments in the same

plane/orientation as the one in which the
unit will operate.

applications, see the CSC-2000 Applications
Guide.

(or

CSC-2000 Series Reset Volume Controllers 3 Installation Guide

BEIGE Controllers (Direct Acting)

1. Check that there is 0 psi at the “T” Port.

2. Use a ow hood or “tee” a Magnehelic® (or equiv­alent) dierential pressure gauge between the
controller and the ∆P pick-up.

3. The “LO” ow seing limit (center knob) must
be set rst. Temporarily adjust the thermostat
for a branch pressure lower than the 8 psig reset
start point (minimum cooling); typically 6 psig or
less is best. Removing the thermostat branch line
would be another acceptable method. Adjust the
“LO” knob (center knob) clockwise to increase or
counterclockwise to decrease ∆P limit. Normally
one-half turn will cause a 0.1 ∆P change. Allow
for reaction time. Depending on actuator size and
position, timing will vary. To position an actua­tor/damper from closed to open may take several
minutes.

NOTE: If the “LO” ow seing limit must be set at

“0” (zero minimum), do not turn the “LO”
knob fully counterclockwise. The knob will
adjust three to four full turns aer a zero
minimum is reached. Turning the “LO”
knob fully counterclockwise will result in
a negative reset condition. This means that

when the controller is beginning to reset
at 8 psig from the thermostat, it must rst
overcome the negative adjustment and will
not begin to reset until a higher thermostat
reset pressure is reached. This negative

reset will also reduce the eective range
of the controller by reducing the high end
and narrowing the reset span. If a zero
minimum is required, adjust the “LO” knob
until the controller just begins to crack the
damper open, then back-o one-fourth turn
and verify zero airow.

4. The “HI” ow seing limit (outer knob) must be
set aer the “LO”. Temporarily adjust the ther­mostat for a branch pressure higher than the 13
psig reset stop point (maximum cooling); typically
17 psig or greater is best. Removing the thermo­stat branch line and teeing-in to the main air line
would be another acceptable method. Adjust the
“HI” knob (outer knob) clockwise to increase or
counterclockwise to decrease ∆P limit. Nominally
one-half turn will cause a 0.1 ∆P change. Allow for
reaction time.

5. Recheck the “LO” and the “HI” seings at least
twice, verify seings, and ne tune each time if
necessary. This procedure will remove internal
component tensions and conrm seings.

6. Reconnect the thermostat branch line if necessary,
and adjust the thermostat to the desired room tem­perature setpoint.

NOTE

NOTE

: The “HI” adjustment limits the travel of

the reset mechanism. Therefore, the reset
span will be less than 5 psig, the upper limit
being less than 13 psig.

: Always make adjustments in the same

plane/orientation as the one in which the
unit will operate.

Maintenance

No routine maintenance is required. Each compo­nent is designed and manufactured for reliability
and performance. Careful installation and use will
ensure long-term dependability.

CAUTION

Pneumatic devices must be supplied with clean,
dry control air. Any other medium (e.g., oil
or moisture contamination) will result in the
device’s eventual failure.

More Information

For additional specications of particular models,
see the CSC-2000 Data Sheet (hp://bit.ly/PWVwol).

For principles of operation, troubleshooting, and

sample applications, see the CSC-2000 Applications

Guide (hp://bit.ly/RAWIzn).

(Scan QR code
to download
Applications
Guide.)

KMC Controls, Inc.

19476 Industrial Drive

New Paris, IN 46553

574.831.5250

www.kmccontrols.com; [e-mail]

CSC-2000 Series Reset Volume Controllers 4 Installation Guide© 2012 KMC Controls, Inc. 205-019-01R