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VAV MODULATING HOT WATER REHEAT NO 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
mode where
DO-11
available such as having
Input / Output Points
VAV Modulating HW Reheat, no fan AO (0
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
VAV Modulating HW Reheat, no fan Tri-state
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) |
drives the hot water valve open and
as first stage modulating heat and
AO-14
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)
Tri-State Heat Valve Open
Tri-State Heat Valve Closed
Modulating Heat Control (0
Damper Control (CBV-2U4-3T only)
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)
Heat Valve Open
Heat Valve Close
Damper Control (CBV-2U4-3T only)
CBV-2U4-3T(-N) Control Sequences
TABPriAirMaxStpt
TabPriAirMinHtgStpt
(A153) and its
or
AO-14
DO-11
drives it closed. There are additional options
DO-12
as second stage modulating heat.
AO-15
10 Vdc)
...
DESCRIPTION
...
10 Vdc)
DESCRIPTION
TABPriAirDbandStpt
(A210), or
(A211) as required to maintain
TabPriAirMaxHgtStpt
and
in a tri-state control
D0-12
37
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