Application

Application Notes
Dual Duct Sequence Configurations
6
Siemens Industry, Inc.
Application Note
A6V11692053
Smart Infrastructure – Building Products
2019-04-01
Overview
14069, 14169 and 14369
Dual Duct Variable Volume with Two Inlet Sensors: Templates 14069, 14169 and 14369.
This application modulates the supply air dampers of the dual duct terminal box for cooling,
heating, and ventilation (for demand control ventilation a room air quality sensor is required:
QMX3.P74).
14069: Modulating Electric Heat and Hot Water Radiator (on DXR.x12)
14169: Demand Control Ventilation, Modulating Electric Heat and Hot Water Radiator (on
DXR.x12)
14369: Modulating Hot Water Heat and 1-Stage Electric Radiator (on DXR.x10 “ADXR”)
Terminal box airflow is maintained at the larger of ventilation airflow or the heating or cooling
airflows. The modulating (or staged) heat operates the heating coil to maintain room
temperature at setpoint.
The analog outputs for damper control (1DMPR POS, 2DMPR POS) are modulated by respective
airflow PID controllers. A modulating AO is used for heating (HTG EL POS for modulating
electric; HTG V POS for hot water).
Additionally, 14069 and 14169 each have a floating output for hot water radiator (RAD V POS);
14369 has a binary output for a single stage electric radiator (RAD EL POS).
Each duct can be configured to provide hot, cold (or both) airflow, and the source for ventilation
air can be configured to come from cold duct, hot duct, or both. Additionally, the transition
between heating and cooling is configurable for hot/cold airflow mixing control or snap acting
control. See Dual Duct Configurations for detailed information on these topics.
Plant Diagram
VavSuPos1
VavSuPos2
Variable air volume supply air
damper
AirQualR
Room air quality
(part of ROpUn)
VavSuDiffP1
VavSuDiffP2
Supply air VAV differential
pressure sensor
ROpUn
Room operating unit
(14169 = QMX3.P74)
Hcl
Modulating electric (14069,
14169)
Modulating hot water coil (14369)
TR
Room temperature
(part of ROpUn)
Rad
Modulating HW (14069, 14169)
1-stage electric (14369)
TSu
Supply air temperature sensor
(for monitoring and diagnostics)
Description of Functions
Basic Functions
Auxiliary Functions
⚫ Operating modes for room, plant and
devices
⚫ Each VAV duct can provide conditioned
air for cooling or heating
⚫ Ventilation air provided by either or both
ducts (14169 includes DCV)
⚫ Mixing control or snap action control,
configurable
⚫ Supply air VAV box, pressure sensor
⚫ Electric modulation heating coil for
heating
(14069 and 14169)
⚫ Hot water radiator (14069 and 14169)
⚫ Hot water coil (14369)
⚫ 1-Stage electric radiator (14369)
⚫ Supply chain coordination
⚫ Green Leaf function
⚫ Comfort button for occupant override