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Siemens BACNET 125-5037 Owner's Manual page 37

Building technologies bacnet vav actuator
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Descriptor
Address
STAGE MIN
DMPR STATUS
SWITCH LIMIT
SWITCH TIME
CAL MODULE
STAGE COUNT
VALVE COUNT
STAGE TIME
SWITCH DBAND
CTL STPT
FLOW STPT
Siemens Building Technologies, Inc.
1
Application
83
2562, 2564, 2566
2
{84}
2560, 2561, 2562,
2563
85
All except
2560, 2561, 2597
86
All except
2560, 2561, 2597
87
All except 2564,
2565, 2566, 2567
88
2562, 2564, 2566
88
2563
89
2562, 2564, 2566
90
All except
2560, 2561, 2597
{92}
All except
2597
{93}
All except
2597
Siemens BACnet VAV Actuator Owner's Manual
Description
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).
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.
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.
The time, in minutes, before the heat/cool mode can
change over when the other parameters are
appropriate.
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.
The number of electric heating stages used by the
application. DOs associated with unused stages
may be used as spare DOs.
The number of heating valves available.
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.
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.
The actual setpoint value being used as input for the
active temperature control loop.
The setpoint of the flow control loop.
27

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