Siemens 125-5050 Application 2863 VAV with Hot Water Reheat

Chapter 2 – Applications
18
Siemens Industry, Inc.
BACnet ATEC Owner's Manaul
125-5050, Rev. AA
4/20/2010
Baseboard Radiation
Baseboard radiation can be a two-position valve or electrical resistance heating.
If the controller is in cooling mode, the heating valve is closed. When in heating mode,
the controller will operate the heating valve to maintain the heating setpoint.
Electric Heat Interlock
CAUTION
Do not set EHEAT FLOW (the defined minimum) to less than 5%; otherwise, the
electric heat interlock will be disabled.
The electric heat stages will be disabled (turned off) when the electric heat airflow is
less than the defined minimum.
Application 2863 VAV with Hot Water Reheat
In Application 2863, the controller modulates the supply air damper of the terminal box
for cooling and controls a hot water valve or baseboard radiation for heating. When in
heating, the terminal box either maintains minimum airflow or modulates the supply air
damper. In order for the terminal box to work properly, the central air-handling unit
must provide supply air for cooling.
See the following figures.