Applications Guide
Table Of Contents
- CEP-4000 General Information
- SSE-1000/2000 Flow Sensors
- Thermostats
- VAV Single Duct Cooling/Heating Applications
- VAV Dual Duct Cooling/Heating Applications
- Index
CEP-4000 Series VAV Flow Controller-Actuators 7 Applications Guide
Basic Control Logic
The Controller
The CEP-4000 Series Controller Actuator is designed
to:
• Receive a “Requested Flow” signal from the
thermostat (3–6 VDC on terminal 6). (See the
Voltage/Velocity Correlation section.)
• Compare it to “Actual Flow” (1–5 VDC on
terminal 7 or 9–18 VDC on terminal 2).
• Then drive the damper open or closed as required
to match the airow.
The Flow Sensor
The CEP-4000 series controller uses SSE-1000/2000
series “hot wire anemometer” sensors. These sen-
sors consist of two coils of wire mounted in the air
stream: one monitors airow, while the other is a ref-
erence used for duct temperature compensation. The
SSE-2000 series sensors also include a temperature
sensor for use with heating/cooling “changeover”
applications (requires an additional relay module).
The Thermostat
The CTE-1000/1100/5000 series thermostats can be
used with the CEP-4000 series. These thermostats
measure room temperature, compare it to the set-
point, and output an appropriate signal to the CEP-
4000 to reset airow accordingly.
The thermostat can output a signal of 0 to 6 VDC to
the controller. The Voltage/Airow Correlation sec-
tion shows that a value of 3.0 VDC requests zero fpm
ow, while 6.0 VDC requests 3000 fpm. Anything
less than 3.0 VDC to the controller is requesting zero
airow. By limiting the output of the thermostat to a
certain voltage, minimum or maximum ow is set on
the controller.
For example, if the minimum adjustment on the ther-
mostat is set for 3.8 VDC (Terminal 6), the thermostat
will never request less than approximately 290 fpm
airow from the controller. Similarly, the maximum
adjustment can be 6.0 VDC or less to dene a maxi-
mum ow limit (e.g., 5.40 VDC = 2200 fpm).
CAUTION
To prevent damage to the SSE series sensors, do
not touch or handle the interior wire windings.
SSE-2000 Series
SSE-1000 Series