User manual

Chapter 2 – Applications
16
Siemens Industry, Inc.
BACnet ATEC Owner's Manaul
125-5050, Rev. AA
4/20/2010
Modulate Damper During Heating Mode (optional)
CAUTION
If the damper is set to modulate in heating mode, make sure the controller is in
the appropriate mode for the current supply air temperature.
Applications that have a heating source (valve/electric) can be configured to modulate
the flow setpoint in sequence with the heating source.
Hot Water Reheat
CAUTION
Do not set HTG FLOW MIN to 0 cfm (0 lps). A minimum airflow should be
provided across the heating coils when the heating valve is open.
When the controller is in cooling mode, the heating valve(s) are closed.
The heating loop modulates the heating valve(s) to warm up the room. In cooling
mode, the heating valve is closed.
Electric Reheat
CAUTION
Verify that the equipment is supplied with safeties by others to ensure that there
is airflow across the heating coils when they are to be energized.
The heating loop controls up to three stages of electric reheat to warm up the room.
The electric reheat is time modulated using a duty cycle. When the controller is in
cooling mode, the electric heat is OFF at all times.
Notes
1. If the temperature swings in the room are excessive or if there is trouble in
maintaining the setpoint, contact your local Siemens Industry representative for
more information.
2. The BACnet ATEC, as shipped from the factory, keeps all associated equipment
OFF. The controller and its equipment are released to application control at
start-up.