5.10 Heating
An additional heater is used when the ERC is not available for heating or is
available for heating but has reached its maximum position. To release the heating,
the supply air temperature must fall below the setpoint - heating difference.
The heating is supported by preheating if possible, but preheating functions are not
included in the supply air temperature sequence.
5.10.1 Water based heating with frost protection (HclHw21y)
If ERC cannot maintain the supply air temperature setpoint, water heating coil can
be activated and controlled as second heating sequence.
After activation, heating coil pump is activated and heating coil valve is controlled
to keep the supply air temperature at its setpoint. During normal operation the
pump runs depending on the valve position (fix switching on point 5%), when the
plant is switched off, the pump is continuously running to ensure reliable measuring
oft the return temperature.
Available parameters
Current value
BACnet object
R/RW
Unit
Supply setpoint for heating coil
SpTSuHcl
AVAL,215
RW
°C
Return temperature value
TFrPrtHcl
AI,58 (B3)
AI,64 (B4)
AI,80 (X8)
AVAL,317 (X21)
AVAL,468 (AI1)
R
°C
Heating valve position
Prio2: Fire / Smoke
Prio5: Protection Frost / plant control
HclVlvPos
AO,108 (A1)
AO,117 (A2)
AO,126 (A3)
AO,135 (A4)
AVAL,387 (POS9)
AVAL,476 (AO1)
AVAL,483 (AO2)
RW
%
Heating pump status
Prio2: Fire / Smoke
Prio5: Protection Frost / plant control
HclPuCmd
BO,57 (Q1)
BO,72 (Q2)
BO,87 (Q3)
BVAL,248 (POS9)
RW
Special settings
BACnet object
R/RW
Unit
Heater Kp
GainHclTSuCtrH
AVAL,221
RW
% / K
Heater Tn
TnHclTSuCtrH
PINTVAL,110
RW
sec.
Testing and debugging
BACnet object
R/RW
Unit
Heating coil device mode
Prio 2: Fire / Smoke
Prio 5: Protection from plant control
HclDevMod
MVAL,154
1: Off with idle frost
2: Control Mode
3: Full Open
4: Off with runtime frost
Water coil frost protection
To always minimize the risk of freezing of the water heating coil, 2-stage frost
protection and additional idle time frost protection functions are available.
Application functionalities
Heating
5
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