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VAV COOLING ONLY 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. Normally on a cooling only VAV box both the
TabPriAirMinHtgStpt
rate of flow into the space while in the heating mode.
SERIES VARIABLE SPEED FAN
The variable fan speed will be controlled by modulating AO 15 (default 0
required, the fan speed will increase. See
INPUT / OUTPUT POINTS
VAV Cooling Only 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) |
(A153) and the
TabPriAirMaxHgtStpt
Fan Control
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)
Variable Speed Series Fan Speed Control (0
Damper Control (CBV-2U4-3T only)
CBV-2U4-3T(-N) Control Sequences
TABPriAirMaxStpt
TabPriAirMinHtgStpt
(A153) and its
(A212) will be the same to maintain a minimum
on page 58 for more detail.
DESCRIPTION
10 Vdc)
...
TABPriAirDbandStpt
(A210), or
(A211) as required to maintain
TabPriAirMaxHgtStpt
...
10 Vdc). As more cooling is
33
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