Siemens BACNET 125-5037 - Manual (Page 37)

Siemens BACnet VAV Actuator Owner’s Manual
Siemens Building Technologies, Inc. 27
Descriptor Address
1
Application Description
STAGE MIN 83 2562, 2564, 2566 The value, in percent, which the heating loop must
go below for the electric heat to be OFF for the full
duty cycle (STAGE TIME).
DMPR STATUS {84}
2
2560, 2561, 2562,
2563
This point is used only when CAL MODULE set to
YES. It readjusts the damper position if the
command value is not equal to the actual position of
the damper. CAL indicates that the damper is
operating normally. RECAL indicates that the
damper position was adjusted (recalibrated) by 25%
because the desired airflow was not obtainable
under its current status.
SWITCH LIMIT 85 All except
2560, 2561, 2597
The active temperature control loop output must be
less than this value to switch between cooling mode
and heating mode. Actual switchover depends on
SWITCH DBAND being exceeded and is subject to
SWITCH TIME being expired.
SWITCH TIME 86 All except
2560, 2561, 2597
The time, in minutes, before the heat/cool mode can
change over when the other parameters are
appropriate.
CAL MODULE 87 All except 2564,
2565, 2566, 2567
YES indicates that the Autozero Modules are
enabled to calibrate the air velocity transducers.
The dampers will not be used for calibration. NO
indicates that Autozero Modules are disabled and
that the air velocity transducers will be calibrated by
closing the dampers. Valid input: YES or NO.
STAGE COUNT 88 2562, 2564, 2566 The number of electric heating stages used by the
application. DOs associated with unused stages
may be used as spare DOs.
VALVE COUNT 88 2563 The number of heating valves available.
STAGE TIME 89 2562, 2564, 2566 The cycle time in minutes for the electric reheat
stages. For example, if there are three stages of
electric heat and STAGE TIME = 10 minutes,
STAGE COUNT = 3, and AVG HEAT OUT = 150%
then, Stage 1 is ON for 10 minutes (100% of the
time), Stage 2 is ON for 5 minutes (50% of 10
minutes) and OFF for 5 minutes, and Stage 3 is
OFF.
SWITCH DBAND 90 All except
2560, 2561, 2597
The temperature range in degrees which is
compared to the difference between CTL TEMP and
CTL STPT. The difference must exceed this value
for temperature control mode to change over.
Changeover is also subject to the active temperature
control loop output being below SWITCH LIMIT
(Point 85) and SWITCH TIME being expired.
CTL STPT {92} All except
2597
The actual setpoint value being used as input for the
active temperature control loop.
FLOW STPT {93} All except
2597
The setpoint of the flow control loop.