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CSP-4702 Static Pressure (Bypass) Control 1 Application Guide, AN0114A Rev. A

Procedure

For static pressure applications:

1. Connect the “HI” port of the CSP-4702 to the

pitot tube or SSS-1000 series sensor (see Air Pres-

sure Connection on page 3).

2. Connect the 24 VAC power (see Wiring Connec-

tions on page 2). Optionally connect remote

setpoint and pressure reading devices to a BAS

(Building Automation System) controller.

3. Set the MIN ow limit to the desired bypass

pressure setpoint (see Bypass Pressure Setpoint

on page 3).

4. Set the rotation direction to CW or CCW for the

“open” direction (instead of “close” direction—

see Rotation Direction on page 2).

Application Guide

CSP-4702

Static Pressure (Bypass) Control

Contents

Introduction ...................................................................1

Procedure .......................................................................1

Wiring Connections .......................................................2

Rotation Direction .........................................................2

Air Pressure Connection .................................................3

Bypass Pressure Setpoint ................................................3

Troubleshooting .............................................................4

More Information ........................................................... 4

Important Notices ..........................................................4

Introduction

Besides VAV applications, the CSP-4702 can also act

as a static pressure controller in such applications

as RTU/AHU bypass control. It is not connected to a

thermostat for this application.

In bypass applications, the damper should open

(decreasing the pressure) if the pressure input

signal is higher than the setpoint. This is opposite

of VAV applications, in which the damper closes

(decreasing the ow) if the pressure input signal is

higher than the setpoint.

CSP-4702

24 VAC

Bypass Damper

To Low Pressure Port

on Pitot Tube

to H or L Port on

SSS-100x Sensor

(Mounted Perpendicular

to Air Flow)

To HI Port 1/4" Tubing

Optional Remote Setpoint Input (2–10 VDC proportional to 0–2" wc) from BAS

Optional Pressure Reading Output (1–5 VDC proportional to 0–2" wc) to BAS

SSS-100x Sensor

3/8" Tubing

(to H or L)

3/8" to 1/4"

Union Adapter

Air Handler Unit (AHU)

Roof Top Unit (RTU)

Supply Air

Return Air

Summary of content (4 pages)

PAGE 1
CSP-4702 Static Pressure (Bypass) Control Application Guide Contents Procedure For static pressure applications: Introduction....................................................................1 Procedure........................................................................1 Wiring Connections........................................................2 Rotation Direction..........................................................2 Air Pressure Connection..................................................
PAGE 2
Wiring Connections Rotation Direction 1. Loosen the screw on the conduit fitting and lift up to remove the fitting. Set the rotation direction to CW or CCW for the “open” direction (instead of the “close” direction). The CSP-4702 is factory-set for counterclockwise to close. To reverse the direction (with the conduit cover removed), move the jumper to the CW position. 2. Using a utility knife or drill, cut the red plug to accept wiring or replace the plug with an application-specific fitting.
PAGE 3
Air Pressure Connection Bypass Pressure Setpoint Connect the CSP-4702 to a differential pressure sensor (mounted in the supply air duct) with 1/4inch OD x 0.040-inch wall FR instrument and control tubing: To set the bypass pressure setpoint (minimum flow limit on the CSP-4702): 1. With the conduit cover removed, connect a voltmeter to the meter taps. The middle pin (REF) is the common for the outer (MIN and MAX) pins. 2. Adjust the MIN potentiometer for the desired minimum voltage.
PAGE 4
Troubleshooting More Information No Rotation For specifications, accessories, and other information, see the CSP-4702 Data Sheet on the KMC web site. NOTE: • For about 15 seconds after power is applied, no rotation occurs and one or both of the LEDs will flash. Check that the shaft moves freely. (Press and hold the gear disengagement lever and manually rotate the shaft.) • Check wiring. (See Wiring Issues section below.