Error! No text of specified style in document. DNS-24, DNT-T103, & DNT-T221 Application Guide
Page 12 of 35
Document Edition 3.1
Control Functions
OVERVIEW
1. CONTROL APPLICATIONS (DNT-T103 AND DNT-T221 ONLY)
When connected to an MS/TP network, the DNT-T103 BACstat may configured to operate according to one of 8
possible application control strategies, and displayed in the Application variable (AV12).
Application Description AV12
None (MUX) Provides remote control of the outputs from another device. 0
VAV Provides control of a simple VAV box and optional fan. 1
VVT Provides control of a simple VVT box and optional fan. 2
HPU Provides control of a Heat Pump Unit with a reversing valve and a fan. 3
FCU Provides control of a Fan Coil Unit with heating/cooling and a fan. 4
Unit Heater No longer supported. Use FCU instead.
Radiation/Reheat Provides control of single or multi-stage heating with no fan. 5
Humidity Provides control of a Humidifier and assumes a model of the BACstat
with a humidity sensor.
6
Refer to the Application section of this guide for further detail on each of these control strategies, starting on page
18.
2. A
LGORITHM MODE
The application control strategy operates in one of various basic modes, as determined by the Algorithm Mode
variable (AV13).
Algorithm Mode Description AV13
Unoccupied (Night) Uses Night Setpoints 0
Occupied (Day) Uses Day Setpoints 1
Minimum VAV Only: Forces the box to its minimum position 10
Maximum VAV Only: Forces the box to its maximum position 11
Closed VAV Only: Forces the box to its fully closed position 12
Open VAV Only: Forces the box to its fully open position 13
Zero Calibration VAV Only: Forces calibration of the bias so the air flow reads
zero at current conditions. This assumes that the Air Handler has
been shut down and that there is no air flow at the box.
14
Heating Lockout All heating control and associated icons are completely disabled
(as though no heating stages even exist)
20
Cooling Lockout All cooling control and associated icons are completely disabled
(as though no cooling stages even exist)
21
Heating/Cooling Lockout Both heating and cooling control and their icons are disabled 22
Unless the fourth digit of the Display Code (AV15) is set to 1 or 5, or Fan Control is configured as Manual, the
top two buttons on the BACstat – O
FF (O) and ON (I) – will switch between Night and Day modes. Changing to
the other modes for VAV is keypad accessible in Air Balancer mode within the Service Tool menus. The Alg.
Mode (AV13) is also fully accessible from another device over the network (via GCL or ORCAview OWS or 3
rd
Party devices), to command it to any mode as required (including the lockouts).
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