Vav One To Three Stage Electric Reheat Variable Speed Fan; Temperature Control; Fan Control - ABB CBV-2U4-3T User Manual

VAV ONE TO THREE STAGE ELECTRIC REHEAT VARIABLE SPEED FAN

TEMPERATURE CONTROL

When the zone temperature is greater than, or equal to, the cooling temperature setpoint, the controller will
enter the cooling mode. The primary air flow rate will be varied between its
deadband setpoint, and its maximum Flowrate setpoint
the zone at the cooling temperature setpoint.
When the zone temperature falls to the heating setpoint, the controller will enter the heating mode and the
primary air flow rate will be varied between its
(A212), or maximum heating Flowrate setpoint. The stages of electric heat are then staged and optionally
duty-cycled (PWM), as required to maintain the zone at the heating temperature setpoint.

FAN CONTROL

Parallel Variable Fan Speed Option
The variable fan speed will be controlled by modulating
mode only. As more heating is required, the fan speed will increase. See
detail.
Series Variable Fan Speed Option
The variable fan speed will be controlled by modulating
fan will run at a slower speed. As more heating or cooling is required, the fan speed will increase. See
Control
on page 58 for more detail.
Input / Output Points
VAV Electric Reheat with variable speed fan
IO POINTS
UI-01
UI-02
UI-03
UI-04
UI-08
DO-09
DO-10
DO-11
DO-12
DO-13
AO-14
AO-15
AO-16
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CBV-2U4-3T(-N) Control Sequences
CBV-2U4-3T(-N) |
TabPriAirMinHtgStpt
Zone Temperature (with optional override button)
Setpoint Adjustment (optional 5K slider)
Discharge Temperature (optional)
CO , Humidity, or occupancy signal (all optional)
2
Flowrate Sensor
Damper Control (CBV-2U4-3T-N only)
Damper Control (CBV-2U4-3T-N only)
Electric Heat1
Electric Heat2 (optional)
Electric Heat3 (optional)
Variable Speed Parallel or Series Fan Speed Command (0
Damper Control (CBV-2U4-3T only)
TABPriAirDbandStpt
TABPriAirMaxStpt (A211) as required to maintain
(A153) and its
(default 0 10 Vdc). The fan will run in heating
...
AO 15
Fan Control
(default 0 ... 10 Vdc). In deadband mode, the
AO-15
DESCRIPTION
...
10 Vdc)
(A210), or
TabPriAirMaxHgtStpt
on page 58 for more
Fan
36