5.10.2 Electrical heater (HclEl21y)
After ERC has reached its full output but TSu setpoint is not reached, electrical
heating coil can be activated and controlled as second heating sequence to raise
the supply air temperature TSu.
Safety functions
Some electric heaters include an output for an overheating safety thermostat. The
input for receiving this information can be activated on the controller and after the
active signal, the electrical heater is turned off and the ventilation unit is turned off.
The fan speed must be above the set minimum speed to activate the electric
heater.
The overtemperature detector must be connected to the electric heater via
hardware unless local regulations allow software interlock.
It can be selected whether the fans must be stopped immediately after the safety
thermostat has been triggered or whether the fans may run for at least the delay
time for the cooldown of the electric heaters (see also
Start-up / shut-down sequence [➙ 130]).
Available parameters
Current value
BACnet object
R/RW
Note
Current supply air temperature setpoint for heating
SpTSuHcl
AVAL,211
RW
°C
Electrical heater output signal
Prio2: Fire / Smoke
Prio5: Protection
HclElPos
AO,64 (Y1)
AO,107 (A1)
AO,116 (A2)
AO,125 (A3)
AO,134 (A4)
AVAL,386 (POS9)
AVAL,475 (AO1)
AVAL,482 (AO2)
RW
%
Over temperature detection
HclOvrTDet
BI,112 (X3)
BI,129 (A1)
BI,78 (D1)
BI,95 (D2)
R
Basic settings
BACnet object
R/RW
Note
Enable electric heating coil
EnHclEl
BVAL,197
RW
Fan switch-off delay
DlyOffAflHldH
PINTVAL,107
RW
s
Minimum heater output before fan switch off delay is
activated
SwiOnAirFlHldH
AVAL,213
RW
%
Special settings
BACnet object
R/RW
Note
Heater Kp
GainHclTSuCtrH
AVAL,214
RW
% / K
Heater Tn
TnHclTSuCtrH
AVAL,108
RW
sec.
Pulse period electrical heater
HclElPlsPrd (Y1)
PINTVAL,617
RW
BACnet property
4984
Minimum switch on time
HclElTiOnMin (Y1)
PINTVAL,618
RW
BACnet property
4994
Application functionalities
Heating
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