Applications Guide

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CSC–2000 Series Pneumatic VAV Reset Volume Controllers 1 Applications Guide

Pneumatic VAV Reset Volume Controllers

CSC–2000 Series

Applications Guide

General Information .............................................................................................. 2

CSC–2000 Series Overview .................................................................................................................................2

Models and Speciﬁcations ...................................................................................................................................3

Mounting .............................................................................................................................................................4

Connections ........................................................................................................................................................4

All Units ........................................................................................................................................................4

Beige Units ....................................................................................................................................................4

Gray Units .....................................................................................................................................................4

Adjustments, Calibration, and Operation of BEIGE Controllers ............................. 5

Adjustments and Calibration ...............................................................................................................................5

Pressure Independent Operation .........................................................................................................................6

Reset Operation ...................................................................................................................................................6

Adjustments, Calibration, and Operation of GRAY Controllers .............................. 7

Adjustments and Calibration ...............................................................................................................................7

Pressure Independent Operation .........................................................................................................................7

Reset Operation ...................................................................................................................................................8

Troubleshooting ..................................................................................................... 8

Subcooling and Overheating ...............................................................................................................................8

Apparent Hunting and Negative Pressure ............................................................................................................8

Applications ...........................................................................................................9

Single Duct Cooling, N.O. Damper, D.A. Thermostat ..........................................................................................9

Single Duct Cooling, N.C. Damper, R.A. Thermostat .........................................................................................10

Dual Duct, N.O. Heating Damper, N.C. Cooling Damper, R.A. Thermostat ......................................................11

Dual Duct, Constant Volume, N.C. Heating., N.O. Cooling, D.A. Thermostat ...................................................12

Summary of content (12 pages)

PAGE 1
Pneumatic VAV Reset Volume Controllers CSC–2000 Series Applications Guide General Information............................................................................................... 2 CSC–2000 Series Overview..................................................................................................................................2 Models and Specifications....................................................................................................................................
PAGE 2
General Information CSC–2000 Series Overview 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. The CSC–2000s are differential-pressure (∆P), submaster controllers with adjustable minimum and maximum airflow settings. A master controller, typically a room thermostat, resets the CSC velocity setpoint.
PAGE 3
Models and Specifications Output Sensitivity 0 to 1" range unit, 5 psig/0.02" wg (35 kPa/5 Pa) 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. 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.
PAGE 4
Mounting Connections As close to the flow 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.) 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”.
PAGE 5
Adjustments, Calibration, and Operation of BEIGE Controllers Adjustments and Calibration 4. The “HI” flow setting limit (outer knob) must be set after 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.
PAGE 6
Pressure Independent Operation Reset Operation Differential pressure is sensed via a ∆P pickup mounted upstream of the damper (VAV terminal inlet). The ∆P pickup is a dual pressure pickup sensing both high pressure and low pressure. The high pressure is connected to the “X” port and the low pressure is connected to the “Y” port.
PAGE 7
Adjustments, Calibration, and Operation of GRAY Controllers Adjustments and Calibration Pressure Independent Operation 1. Check that there is 0 psi at the “T” Port. Differential pressure is sensed via a ∆P pickup mounted upstream of the damper (VAV terminal inlet). The ∆P pickup is a dual pressure pickup sensing both high pressure and low pressure. The low pressure is connected to the “X” port and the high pressure is connected to the “Y” port.
PAGE 8
Troubleshooting Reset Operation Subcooling and Overheating With sufficient airflow and a thermostat signal connected to the “T” port of less than 3 psig, the controller will position the actuator to regulate airflow at the HI limit setting. In this state, the static diaphragm is balanced over the nozzle through the forces of the opposing springs and forces of the high and low pressures. The CSC-2000 series are position sensitive. See the Mounting section.
PAGE 9
CSC–2000 Series Pneumatic VAV Reset Volume Controllers Flow L 9 Max Air Flow Actuator 5-10 PSI N.O. Damper N.O. HW Valve 3-8 psig 68.5° 70° Room Temperature Increase Setpoint 71.5° 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 PSI Thermostat Pressure Min Air Flow H Airflow Pickup N.C. PE Switch Set @ 6 psig Heating Options M SINGLE DUCT COOLING, N.O. DAMPER, D.A.
PAGE 10
CSC–2000 Series Pneumatic VAV Reset Volume Controllers Flow L 0 68.5° 70° Room Temperature Increase Setpoint 71.5° PSI Max Air Flow Actuator 5-10 PSI N.C. Damper 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 Thermostat Pressure Min Air Flow H Airflow Pickup N.C. HW Valve 8-13 psig M N.O. PE Switch Set @ 10 psig Heating Options SINGLE DUCT COOLING, N.C. DAMPER, R.A.
PAGE 11
CSC–2000 Series Pneumatic VAV Reset Volume Controllers Flow H H L L Max Heating Air Flow Min Cooling Air Flow Actuator 5-10 PSI Hot Deck N.O. Damper Actuator 5-10 PSI Cold Deck N.C. Damper 68.5° 70° Room Temperature Increase Setpoint 71.
PAGE 12
© CSC–2000 200 KMC Series Controls, Pneumatic Inc. VAV Reset Volume Controllers Flow KMC Controls, Inc. 19476 Industrial Drive New Paris, IN 46553 574.831.5250 www.kmccontrols.com; info@kmccontrols.com 2 L Actuator 5-10 PSI H Min Heating Air Flow Cold Deck N.O. Damper Actuator 5-10 PSI Hot Deck N.C. Damper L 68.5° 70° Room Temperature Increase Setpoint 71.