Application

Room Segment Functions
Device Control Functions HVAC
61
Siemens Industry, Inc.
Application Note
A6V11692042
Smart Infrastructure – Building Products
2019-04-01
Configuration
Parameters
Description
Parameter
Preloaded value
Switch-on point for air flow demand
SwiOnAirFlDmd
4%
Hysteresis for air flow demand
HysAirFlDmd
2%
Hot Water Coil with Supply Air Temperature Control
(HclHw12)
The application function Hot water heating coil with supply air temperature
control (HclHw) operates a hot water valve for a heating coil. The main output is
an analog output for valve position.
This AF has its own PID controller for cascaded supply air temperature control and
quicker response. A supply air temperature sensor is required.
Main features:
⚫ Hot water valve modulation
⚫ Cascaded supply air temperature control
⚫ Heating available status
⚫ Interlocks
⚫ Supply chain interface
The heating coil heating request (HclHReq) is received and used by the supply air
temperture cascade controller and processed into an analog output signal for the
heating coil valve position (HclVlvPos).