Operating Instructions

Chapter 3—Applications for ATEC—VAV with Reheat
3-26 Siemens Building Technologies, Inc.
ROOM TEMPERATURE
CONTROL SCHEDULE
HEAT ON 100%
OF TIME
HEAT OFF
CLG FLOW MAX
COOLING *1
SET POINT
HEATING *1
SET POINT
COLDER WARMER
HEAT COOL
HTG FLOW MAX=
HTG FLOW MIN=
CLG FLOW MIN=
TEC2522CSR1
*2
*3
*4
*2
1. See Sequence of Operation, Control Temperature Setpoints.
2. See Sequence of Operation, Heating/Cooling Switchover.
3. When temperature is near the setpoint, heat is cycled on and off according to the size of the demand. This allows it to
be controlled proportionally rather than with deadbands.
4. The airflow is shown at minimum flow throughout the entire heating mode (default setting). The airflow can optionally
operate parallel (Figure 3-10), sequenced, or overlapping with the heat. See Sequencing Logic.
Figure 3-9. Application 2522 Control Schedule with Minimum Airflow during Heating (default).
ROOM TEMPERATURE
CONTROL SCHEDULE
HEAT ON 100%
OF TIME
HEAT OFF
CLG FLOW MAX
CLG FLOW MIN
COOLING *1
SET POINT
HEATING *1
SET POINT
COLDER WARMER
HEAT COOL
TEC2522CSOR1
*2
*3
*4
*2
HTG FLOW MIN
HTG FLOW MAX
1. See Sequence of Operation, Control Temperature Setpoints.
2. See Sequence of Operation, Heating/Cooling Switchover.
3. When temperature is near the setpoint, heat is cycled on and off according to the size of the demand. This allows it to
be controlled proportionally rather than with deadbands.
4. The airflow is shown operating parallel with the electric reheat. The airflow can operate at minimum flow throughout the
entire heating mode (Figure 3-9) or sequenced or overlapping with the heat. See Sequencing Logic.
Figure 3-10. Application 2522 Control Schedule with Damper Modulated during Heating.