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Application

ManualsBrandsSiemens ManualsBuilding automationBACnet PTEC Controller Constant Volume with Electric Heat, Application 6662, Application Note
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Sequence of Operation
Auto Discovery
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Siemens Industry, Inc.
Application Note, App 6663
Room CO2
RM CO2 displays the CO
2
value in units of parts-per-million (PPM). RM CO2 (from the
digital 2200/2300 room units) can be used with PPCL in the PTEC/ATEC controller or
unbundled for control or monitoring purposes.
Room RH
RM RH displays the relative humidity value in percent. RM RH can be used for PPCL
in the PTEC or unbundled for control or monitoring purposes.
RM RH displays the relative humidity value in percent.
Room DEW POINT
The controller provides a calculation for DEW POINT temperature in Fahrenheit
degrees (or Celsius degrees) using room temperature (using CLT TEMP) and room
humidity (using RM RH). This calculation is valid for ranges of 55°F (12.8°C) to 95°F
(35°C) and 20 to 100% relative humidity.
Auto Discovery
Auto Discovery allows you to automatically discover and identify PTEC/ATEC
controllers on the BACnet MS/TP Network. There are two basic configurations:
Devices not configured with an address. (Devices are discovered by their unique
serial number.)
Devices configured with an address and available for modification.
Auto Addressing
Auto Addressing allows you to automatically assign device addresses to a PTEC
controller on the BACnet MS/TP Network. If a controller is not configured with a MAC
address, you have the option to auto-address or manually address the controller.
During this time the baud rate is automatically detected by the controller.
Controller(s) must be connected on the BACnet/IP network in order for automatic
addressing to occur.
PPCL STATUS
PPCL STATUS displays LOADED or EMPTY.
LOADED = PPCL programming is present in the controller. A new application
number must be assigned (12000 through 12999).
EMPTY = NO PPCL programming is present.
The maximum number of PPCL dynamic points is 15.
Fail Mode Operation
If the air velocity sensor fails, the controller determines the status of FAIL MODE and
positions the damper accordingly. If FAIL MODE = OPEN and the velocity sensor fails,
the damper will open. If FAIL MODE = CLOSED (the default) and the velocity sensor
fails, the damper will close.
If the room temperature sensor fails, the controller holds the last known temperature
value.