Delta Controls
Document Edition 4.1 Page 13 of 41
Refer to the Application section of this guide for further detail on each of these control strategies, on
page 20.
*Although possible, this is not recommended because it can cause excessive network traffic.
2. A
LGORITHM MODE
The application control strategy operates in one of the following 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 airflow 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
Lockout Modes
Party devices), to command it to any mode as required
(including the lockouts).
Heating and cooling lockout modes are operational for all Control Applications.
Basically, once a BACstat has been configured for various stages of heating and cooling, either the
heating and/or cooling may be disabled on the fly as necessary for various control strategies simply by
commanding the Alg. Mode (AV13). In all other regards, control continues to function the same as it
would when in Occupied mode.
Communications Reset Enable
The Alg mode (AV13) variable also has a property represented by a Comm Reset Enable checkbox in
the object dialog. This can be enabled or disabled, depending on installation requirements.
Disabled
Enabled (the default as of Release 3 Firmware)
• The BACstat does not try a reset if • The BACstat will reset once if
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