Operating Instructions

Autozero Module
Siemens Building Technologies, Inc. 1-7
Autozero Module
The optional Autozero Module (Figure 1-5) is required when continuous operation at
occupied flow is required for an area. The Autozero Module is connected to the air velocity
inlet ports of the ATEC and provides periodic recalibration of the air velocity sensor without
changing air volume being delivered to a room. This recalibration ensures long-term precise
airflow delivery. See Chapter 2—Applications for ATEC—Base VAV and Chapter 3—
Applications for ATEC—VAV with Reheat for more information.
TO DO WIRING
TERMINATIONS
ON TEC
TO AIR VELOCITY
TRANSDUCER
PORTS ON TEC
TO AIR VELOCITY
SENSOR PORTS
IN DUCT
DIMENSIONS IN INCHES.
MILLIMETERS IN
PARENTHESES
2-11/32
(60)
2-15/32
(63)
3-3/4
(95)
1-1/16
(27)
TEC0046R4
HI
LO
HI
TO TEC
TO AVS
LO
Figure 1-5. Autozero Module.
Actuators
Both models of the ATEC include an internally wired damper actuator. Application 2523 uses
an externally wired valve actuator. These actuators, powered through the controller, position
reheat valves or dampers.
For more information about actuators and valve assemblies from Siemens Building
Technologies, Inc., contact your local Siemens Building Technologies representative.