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VAV ONE TO TWO STAGE ELECTRIC REHEAT SINGLE 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 Single Speed Fan Option
During the occupied mode, the intermittent single speed fan will typically be energized in the heating mode.
The typical fan control matrix is as follows, although other options are possible:
MODE
Occupied
Unoccupied
Warm-up
Standby
Series Single Speed Fan Option
The fan will operate continuously whenever the unit is in the occupied state, or in another state and in the
cooling or heating mode. The fan control matrix is as follows:
MODE
Occupied
Unoccupied
Warm-up
Standby
INPUT / OUTPUT POINTS
VAV Electric Reheat with 1 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
COOLING
Off
Off
Off
Off
COOLING
On
On
N/A
On
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)
Parallel or Series Fan
Damper Control (CBV-2U4-3T only)
TABPriAirDbandStpt
TABPriAirMaxStpt
(A211) as required to maintain
(A153) and its
DEADBAND
Off
Off
Off
Off
DEADBAND
On
Off
Off
Off
DESCRIPTION
(A210), or
TabPriAirMaxHgtStpt
HEATING
On
On
Off
On
HEATING
On
On
On
On
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