CBV-2U4-3T(-N) |
Control Sequence Overview
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TEMPERATURE CONTROL
CONTROL MODES
The
CBV-2U4-3T(-N)
continuously compares the zone temperature with the active setpoints. Heating demand
and cooling demand calculations are constantly updated. These calculations are expressed as 0
…
100% heating
demand and 0
…
100% cooling demand.
Heating Mode
In the heating mode, stages of heat are energized, and/or valve positions are increased, as the heating demand
increases. Primary supply air Flowrate is set to the current primary air heating flow setpoint; point
(A212). If the terminal unit includes a variable speed fan, its speed will increase with
heating demand.
•
(A193)
(Current Zone Temperature)
•
(A184)
(
Calculated Heating Demand
)
•
(A182)
(Current Active Heating Setpoint)
Cooling Mode
In the cooling mode, the primary air Flowrate setpoint is modulated toward maximum Flowrate setpoint
(A211) as the cooling demand increases. If the terminal unit includes a series variable speed
fan, its speed will increase with cooling demand.
•
(A193)
(Current Zone Temperature)
•
(A185)
(Calculated Cooling Demand)
•
(Current Active Cooling Setpoint)
•
(
Enable Unocc Cooling
)
Deadband Mode
In the deadband mode, the primary air Flowrate setpoint is reduced to minimum. All heating is off, parallel fans
are off, and series variable speed series fans are set to minimum.
COOLING AND HEATING OFFSETS
These points will offset the
(A182) at the zone temperature cooling and
heating PIDs. When value is entered into the
(A39) point the zone temperature cooling control
PID will enable when zone temperature rises above the
(A183). The cooling zone temperature
control PID will then control to the
(A183) minus the value entered into
(A39). PID
will then disable putting controller into deadband mode once this modified setpoint is achieved.
(32) will work in much the same way however it will add the value entered to the
(A182). PID will enable when zone temperature drops below
temperature rises above this modified value. This is typically used when there is a supply air temperature
setpoint reset at AHU that is monitoring the number of VAVs in deadband mode to determine the setpoint for
the supply air temperature. Utilitzing this feature will drive more VAVs in deadband mode resulting in increased
energy cost savings.
•
(A39) Default 0
(Offset of Active Cooling Setpoint)
•
(A183)
RO
(Current Active Cooling Setpoint)
•
(32) Default 0
(Offset of Active Heating Setpoint)
•
(A182)
RO
(Current Active Heating Setpoint)
ZONE TEMPERATURE SETPOINTS
Zone temperature is controlled to these setpoints, as modified by other factors shown below.
•
(A201)
(Occupied heating temperature setpoint)
•
(A200)
(Occupied cooling temperature setpoint)
Содержание CBV-2U4-3T
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