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VAV MODULATING HOT WATER 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 modulating hot water reheat valve will then drive open
to maintain the desired heating setpoint.
Typically, the modulating heating valve may be controlled by either
control mode where
options available such as having
heat.
FAN CONTROL
Parallel Single Speed Fan Option
During the occupied mode, the intermittent single speed fan will be energized in the heating mode. The fan
control matrix is as follows:
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
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CBV-2U4-3T(-N) |
drives the hot water valve open, and DO 12 drives it closed. There are additional
DO-11
as first stage modulating heat and AO 15 as second stage modulating
AO-14
COOLING
Off
Off
Off
Off
COOLING
On
On
N/A
On
CBV-2U4-3T(-N) Control Sequences
TABPriAirMaxStpt
TabPriAirMinHtgStpt
(A153) and its
or
AO-14
DEADBAND
Off
Off
Off
Off
DEADBAND
On
Off
Off
Off
TABPriAirDbandStpt
(A210), or
(A211) as required to maintain
TabPriAirMaxHgtStpt
and
in a tri-state
DO-11
DO-12
HEATING
On
On
Off
On
HEATING
On
On
On
On
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