Product Overview

Description and Application
The compact analog electronic CSP-4702 is a com-
bination controller-actuator designed primarily for
use on pressure-independent VAV (Variable Air
Volume) terminal units. It also has applications as
an electronic static pressure (bypass) controller.
Dierential air pressure is sensed by an internal
digital CMOS sensor connected via 1/4" FR tubing
to an SSS-1000 series airow sensor. The 0 to 2" wc
(0 to 500 Pa) dierential pressure sensor is internally
linearized and temperature compensated for high
accuracy down to very low pressures.
The CSP-4702 oers full-range ow control of VAV
terminal units when used with the CTE-5202 elec-
tronic room thermostat. (For sample applications
with that thermostat, see the CTE-5202 Applications
Guide.) Air ow control limits may be set at the
thermostat or internal to the CSP-4702. An adjust-
able mechanical stop is also included.
The CSP-4702 accepts a 2 to 10 VDC control signal
from the thermostat. “Anti-jier” circuitry signi-
cantly reduces hunting and needless wear on the
actuator and damper components (from unnecessary
miniscule position changes caused by undamped
analog input signals). It also provides a 16 VDC
output supply to power the thermostat and a 1 to
5 VDC voltage output that is proportional to the
sensed dierential pressure.
The CSP-4702 mounts directly to 1/4- to 5/8-inch (6
to 16 mm) round shafts or 1/4- to 7/16-inch (6 to 11
mm) square shafts, eliminating the need for ex-
pensive and complicated linkages. (An HLO-4001
crank arm kit is available, however, for when di-
rect mounting is impractical.) An HMO-4002 non-
rotation bracket, to prevent lateral movement, is
included. (An HMO-4001 non-rotation “T” bracket
is also available for spanning open distances.) A gear
disengagement buon allows easy manual position-
ing of the actuator.
For troubleshooting and setup, internal status LEDs
(under the cover) indicate green for opening and red
for closing. Factory-set clockwise-to-close rotation
can be reversed by changing a jumper position.
Specifications and design subject to change without notice.
Description and Application 1
Features 1
Specifications 2
Accessories 3
Applications and More Information 4
Features
◆ Pressure-independent VAV (Variable Air Volume)
or static pressure (bypass) control applications
◆ Onboard digital CMOS dierential pressure sen-
sor, internally linearized and temperature com-
pensated, provides high accuracy down to very
low pressures
◆ 1 to 5 VDC voltage output, proportional to the
sensed dierential pressure
◆ 16 VDC output to supply power to a thermostat,
and input for 2 to 10 VDC control signal from a
thermostat
◆ Adjustable mechanical end stop
◆ Internal LED rotation status indicators for trou-
bleshooting and setup
◆ Rotation-to-close direction reversible via jumper
◆ Gear disengagement buon for easy manual po-
sitioning
◆ Mounts directly to 1/4- to 5/8-inch round shafts
or 1/4- to 7/16-inch square shafts, eliminating the
need for expensive and complicated linkages
CSP-4702
Analog Differential-Pressure VAV Controller/Actuator
(Size Shown
Relative to a
Quarter)