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Venmar V10 Anleitung zur Fehlerbehebung Seite 21

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VCES-DDC-IOM-1C
21
All DDC units come with a “BacStat” which can act as a
room thermostat where you can change the heating set-
point, cooling setpoint, summer setpoint and many more.
The BacStat will act as a remote panel and should be
looked at first when there is any issue with the unit.
The supply air sensor also functions like a low limit sensor.
This is not to be confused with the “LL” alarm indicated
above. This sensor has adjustable setpoint limit and time
delay accessible through the BacStat points. If the supply
air sensor is not connected, it will register as a −59 and
the unit will not run after its time delay.
The middle characters represent the mode the unit is in:
Appendix D: DDC Troubleshooting Guide
Table D1: BacStat Keypad
Keypad
Display
Description
dF
Unit is in frost control mode. (This is a status
alarm. It does not indicate that there is a prob-
lem with the unit. It simply means that the unit
is currently defrosting the wheel. This message
will go away after the timed defrost sequence
is complete.)
FC
Unit is in free cooling mode.
CF
Wheel has failed.
LP
Low pressure alarm has tripped. Requires man-
ual reset of DDC power after three failures.
HP
High pressure alarm has tripped. Requires man-
ual reset of pressure switch.
LL
Coil low limit sensor has tripped (supplied by
others).
LS
Low supply air temperature alarm. Requires
manual reset of DDC power.
HS
High supply air temperature alarm. Requires
manual reset of DDC power.
OL
Supply/exhaust overload has tripped. Alterna-
tively, it can be an external unit fault (supplied
by others).
EF
Dirty exhaust filters.
SF
Dirty supply filters.
FS
Flow switch alarm or low water leaving tem-
perature alarm.
Table D2: Unit Mode
Keypad
Display
Mode
Un Unoccupied
Or Occupied recirculation
Ov Occupied ventilation
Ur Unoccupied recirculation
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