Data Sheet for Product

Page 2 of 6
Siemens Building Technologies Inc.,
Landis Division
Control Applications
Operating independently or as part of the APOGEE
Automation System, the Room Pressurization
Controllers can control a variety of pressure
independent applications, including:
x VAV with Hot Water Reheat,
x Constant Volume with Hot Water Reheat,
x Constant Volume in Occupied Mode and VAV in
Unoccupied Mode with Hot Water Reheat
(pneumatic output only)
Description and Specifications
The Room Pressurization Controllers consist of two
differential pressure transducers and either an
electronic or pneumatic controller assembly. Autozero
Modules are available for those applications where
uninterrupted airflow is necessary.
Control algorithms are preprogrammed. The
controllers are ready to operate after selecting the
application and assigning the controller’s address
using the Portable Operator’s Terminal. If desired, the
operator may use the Portable Operator’s Terminal to
adjust the air velocity set points in cfm, differential
flow, room temperature set point and other set points.
The controller is designed for operation and
modification without vendor assistance.
Differential Pressure Transducer
The averaging air velocity sensors (provided by the
terminal box manufacturer) send an average air
velocity measurement of the duct air velocity to the
controller. The air velocity sensors connect to the
differential pressure transducers (which are mounted
in the Room Pressurization Controller) and measure
the average differential pressure. This value is
converted to actual airflow in cfm (lps) by the Room
Pressurization Controller.
Specifications
Temperature Range 32°F to 122°F (0°C to 50°C)
Measurement Range 0 fpm to 4000 fpm
(0 m/s to 20 m/s)
Measurement Resolution
r
4 fpm (
r
0.02 m/s)
Measurement Accuracy*
300 fpm to 4000 fpm
(1.5 m/s to 20 m/s)
r
5% of actual reading
Repeatability
r
10 fpm (
r
0.05 m/s)
Maximum Distance of
Transducer from Air
Velocity Sensor
50 ft. (152 m)
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Autozero Module
The optional Autozero Modules are required when
continuous operation at occupied flow is required. The
Autozero Modules are connected to the air velocity
inlet ports of the Room Pressurization Controller and
provide periodic recalibration of the air velocity
transducers without changing air volume being
delivered to a room. This recalibration ensures long-
term precise airflow delivery.
Specifications
Power Consumption 1.5 Va @ 24 Vac max.
Dimensions 2-1/2" W x 4" H x 1" D
(64 mm x 102 mm x 25 mm)
Weight 0.5 lbs (0.2 kg)
Room Pressurization Controller - Electronic
Output
This controller provides all wiring terminations for
input/output, system and local communication and
power. The cable from the room sensor connects to
the RJ-11 jack on the controller. All other connections
are screw terminations. The controller assembly is
mounted on a plastic track, which mounts directly on
the terminal box. An optional enclosure protects the
controller assembly.
The controller interfaces with the following external
devices:
x Averaging air velocity sensors provided by terminal
box manufacturers,
x Floating control valve and damper actuators,
x Room temperature sensor,
x Portable Operator’s Terminals,
x APOGEE Automation System,
x Room Pressurization Controller Pressure Mode
Switch,
x Digital input devices (dry contacts from motion
sensors, motion detectors, etc.), and
x Digital output device (alarm indication).