Data Sheet for Product
Technical Specification Sheet
Rev. 3, December, 1998
Document No. 149-286P25 Page 1 of 6
Room Pressurization Controllers
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The Room Pressurization Controllers (Figures 1 & 2)
provide Direct Digital Control (DDC) technology for
space pressurization and room temperature control.
Typical applications include hospital isolation rooms,
surgical suites, critical care and ancillary care areas,
labs with constant volume 2 position fume hoods,
areas surrounding laboratories or wherever (positive or
negative) pressurization of the room environment is
critical. The Room Pressurization Controllers maintain
differential flow between the supply and exhaust
terminal boxes by controlling the damper actuators on
each terminal box. Reheat is provided by control of a
reheat valve. The Room Pressurization Controllers
offer two options for control devices. The Room
Pressurization Controller - Electronic Output controls
floating control valve and damper actuators. The Room
Pressurization Controller - Pneumatic Output controls
pneumatic valve and damper actuators. Each can
operate as an independent, stand-alone DDC controller
and can be connected on a Local Area Network (LAN)
with the APOGEE¥ Automation System. This extends
the benefits of DDC to all the building’s HVAC
equipment. This approach to room control includes the
following features.
Features
x Closed loop PID control of HVAC systems to
minimize offset and maintain tighter air volume
and temperature control,
x Dedicated control algorithms for specific
applications,
x Use of wall switch input to change from occupied
to unoccupied mode,
x Reports airflow in cfm (lps),
x Use of keyed switch to select pressurization
mode: protective isolation (positive), infectious
isolation (negative), no isolation,
x Separate minimum and maximum air volume
settings for heating and cooling modes (Variable
Air Volume (VAV)) applications only),
x Separate air volume set points for occupied and
unoccupied modes (CV applications only),
x HVAC diagnostics through communication with a
Portable Operator’s Terminal at a room sensor or
at any field panel,
x Set points and control parameters assigned and
changed using the Portable Operator’s Terminal,
x Electrically Erasable Programmable Read Only
Memory (EEPROM) for storing set points and
control parameters•no battery backup required,
x Returns from power failure without operator
intervention,
x Meets low duct static pressure requirements, and
x Proven APOGEE Automation System DDC
architecture.