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PRIMARY AIR STATE AND DAMPER CONTROL
Cooling Control
In normal operation, terminal units are provided with primary air, which is cooler than the zone temperature
setpoint, therefore, the
primary air damper opens in direct proportion to the cooling load percentage calculated by the
3T(-N)
controller.
Heating Control
The hot primary air state is used when the Air Handler goes into a heating mode. Hot primary air state is
used to put the box into Morning Warmup Mode. In this mode, the primary air damper opens in direct
proportion to the heating load percentage calculated by the
Primary Air Flow Reset CO
The primary air flow setpoint will increase as CO
Primary Air Flow Reset Dehumidification
The primary air flow setpoint will increase as relative humidity increases above the local dehumidification
setpoint.
HEATING CONTROL
Terminal Unit Heat
The
CBV-2U4-3T(-N)
coils and discrete on/off stages of heat.
Baseboard Heat
The
CBV-2U4-3T(-N)
Like terminal unit heat, these may be either analog or digital outputs, depending on what type of point is
available.
FAN CONTROL
The controller has routines for both parallel and series fans. Either type of fan may be controlled as a single
speed on/fan or a variable speed fan. See the fan operation matrix specific to each
for details on its operation.
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CBV-2U4-3T(-N) |
CBV-2U4-3T(-N)
controller operates with a cold primary air state. In this mode, the
2
controller has both analog and digital outputs available to control modulating heating
control outputs not being used for terminal unit heat may be used for baseboard heat.
Control Sequence Overview
CBV-2U4-3T(-N)
increases above the local CO
2
CBV-2U4-
controller.
setpoint.
2
CBV-2U4-3T(-N)
sequence
43
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