Data Sheet for Product

Technical Specification Sheet
Document No. 149-859
February 18, 2015
Siemens Industry, Inc. Page 1 of 4
BACnet PTEC Constant Volume Controller
The BACnet PTEC Constant Volume Controller is an
integral part of BACnet network. The controller
provides high performance Direct Digital Control
(DDC) technology for supply air flow and temperature
control of constant volume systems.
The Siemens BACnet PTEC Constant Volume
Controller can operate stand-alone or can be
networked to perform complex HVAC control,
monitoring and energy management functions and is
designed to reside on any BACnet control system.
Features
 Communicates using BACnet MS/TP protocol for
open communications on BACnet MS/TP
networks.
 BTL listed as a B-ASC device.
 Auto-discovery and Auto-addressing over entire
MS/TP network.
 Programmable using PPCL.
 Setpoints and control parameters assigned and
changed locally or remotely.
 Setpoints and control parameters stored in
Electrically Erasable Programmable Read Only
Memory (EEPROM)—no battery backup required.
 Returns from power failure without operator
intervention.
 No calibration required, thereby reducing
maintenance costs.
 Advanced digital room unit for temperature, CO
2
,
and humidity.
 Supports analog or digital room units with relative
setpoint adjustment and either absolute or
warmer-cooler setpoint adjustments.
 Applications in 550-498PA include a user-
adjustable temperature offset for the room
temperature reading when required for validation
purposes.
 PID control of HVAC systems to minimize offset
and maintain tighter setpoint control.
 Unique control algorithms for specific applications.
 Plenum rated controller.
 UL and cUL Listed for Energy Management
Equipment.
Applications
 Slave Mode (Application 6694)
 Constant Volume Cooling Only (Application 6660)
 Constant Volume with Electric Reheat
(Application 6662)
 Constant Volume with Hot Water Reheat
(Application 6663)
Control algorithms are pre-programmed. The
controller is ready to operate after selecting the
application. If desired, the operator may adjust the air
volume setpoints in cfm (lps), room temperature
setpoints and other parameters. The controller is
designed for operation and modification without
vendor assistance.
If required, new custom code using PPCL
programming language can be added to replace or
supplement the standard application residing in the
controller. This provides the flexibility to meet many