Pressure Independent VAV Applications with CSP-4702
19
CTE-5202 Applications Guide, AN0912A Rev. D
Pressure Independent VAV
Applications with CSP-4702
This section describes using the new CSP-4702 VAV
controller-actuators in new installations as well as
in the place of older CSP-5001/5002, CEP-4xxx, and
CSP-40xx/42xx/44xx/46xx VAV controller-actuators.
The CSP-4702 uses a differential pressure sensor
rather than the flow sensors of the older models. The
differential pressure sensor provides greater ac-
curacy at low air speeds and is much less affected by
the length and quality of the tubing and connections
to the SSS-100x air flow sensors.
NOTE: Air flow volume is determined from
the differential pressure by the formula
Volume
(cfm)
= K
√Δ
P
(the K factor of the
VAV box multiplied by the square root
of the differential pressure in “wc”). The
K factor should be in the information
supplied by the VAV box’s manufacturer.
For CSP-4702 specifications, see the
.
For information on mounting, wiring, con-
figuration, and other information, see the
NOTE: The CSP-4702 also has applications as an
electronic static pressure controller (see the
).
CSP-4702
24 VAC
CTE-5202
Damper
SSS-1000 Series Sensor
1/4-Inch Tubing
(Used in VAV
applications but
not in static
pressure bypass
applications)
SET
POINT
3/8" Tubing
3/8" to 1/4" Union Adapters
