industrie technik evolution AHU-XXXSX1 series, User Manual

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26. Frost protection operation of the heating battery
The frost protection operation on the heating battery can be activated by an external contact or by the control sensor.
To enable the frost protection operation, set
188
=1.
Then select whether the frost protection function is activated by the external contact or the control sensor.
To use a frost protection contact, select
015
=6 (DI1) or
017
=6 (DI2). To use an analogue input configured for “frost protection”
019
=13 (AI1) or
021
=13 (AI2) or
023
=13 (AI3).
If no digital contact is configured for frost protection
015
≠ 6 (DI1) and
017
≠ 6 (DI2) and no analogue input is configured for “frost
protection”
019
≠ 13 (AI1) and
021
≠ 13 (AI2) and
023
≠ 13 (AI3) , the control sensor is used for this operation.
ON
OFF
Texch.
2°C
185
ON
OFF
Treg
2°C
Anti Frost
189
Res.
Anti Frost.: frost protection alarm
Treg.: control sensor
189
: frost protection setpoint
If Treg <
189
frost protection alarm is activated, the and icons flash and the message
ALF
is displayed on the alarms
page. The main output in heating mode is activated and all other outputs are disabled. In case of the presence of a modulating
cooling valve, it takes the position defined by the parameter
191
.
If Treg >= (
189
+ 2°C), the frost protection alarm is disabled and the and icons turn off.
In case the control sensor has an error, the frost protection operation is disabled.
27. Anti-condensation function
If one of the digital inputs is configured as a condensation alarm contact
015
=8 (DI1) or
017
=8 (DI2) or an analogue input is
configured as a “condensation contact”
019
=15 (AI1) or
021
=15 (AI2) or
023
=15 (AI3), and condensation alarm is activated,
the cooling valve is closed while the other functions remain active and the and icons flash.
28. Timer extension or forced presence modes
If timer periods are used for the “economy/boost” function (
199
=0) in the event that the “economy/boost” or “non-occupied
holiday” functions are used, the operating setpoints are calculated considering parameters
120
(economy/boost offset) and
121
(“non-occupied/holiday” operating mode offset).
It is possible to bypass these functions and continue regulation with the base setpoints for a certain period of time (parameter
198
).
To bypass these functions, set the timer extension manually using the MODE button (see “4. Quick access parameter setting”
page 8 or use an external contact
015
=5 (DI1) or
017
=5 (DI2) or use an analogue input configured as a “forcing presence
contact”
019
=12 (AI1) or
021
=12 (AI2) or
023
=12 (AI3).
If the timer periods are used to switch on/off the appliance
199
=1, and the timer extension function is activated by the MODE
button, the unit does not consider the timer periods and keeps the appliance switched on for the time corresponding to the
parameter
198
.
To activate the timer extension function manually, set the parameter
MOC
to
OC
(see “MODE button functionality” page 10 ).
Once activated, a delay equal to the value of the parameter
198
must expire before normal operation resumes.
Once the timer extension function is activated by the external contact, the bypass of the functions continues as long as the
contact is in active position.