CET.ACEC compact controller FläktGroup CET.ACEC compact controller operation
FläktGroup DC-2017-0104-GB 2018-05/R1 • Subject to change 25
5.2.2 Presetting setpoint room temperature
1) The setpoint room temperature can be restricted with the configuration. This means that the rotary switch possibly does not exactly take over the
desired temperature as setpoint. It is also possible to enter the room temperature setpoint with the Modbus, in which case there is no need to spec-
ify the setpoint with the rotary switch.
5.3 Error Messages
Depending on parameter setting (parameter 6), an external error message can be dis-
played with the integrated LED. This is only visible in the CET.ACEC if the cover is
removed!
With the help of parameter 17, a filter fault based on operating hours can be reported.
This fault can only be read out via Modbus and cannot be switched off.
If the CET.ACEC compact controller does not function and also no external error on
the window contact (M13-16) is present, check the following points:
– Supply voltage (M1-2)?
– Room temperature setting (is a Modbus connected and the room temperature exter-
nally predefined)?
– Fan rotary switch (is a Modbus connected and the fan speed externally predefined)?
– Does the air-handling unit have only one cooling function and has a too high room
temperature been set?
– Does the air-handling unit have only have one heating function and has a too low
room temperature been set?
– Does the air-handling unit have one heating or cooling changeover function? If yes,
check the water temperature. In case the water temperature does not match the
operating mode, the unit is not released (fan & valve control).
If problems arise in connection with the Modbus communication, check the following
points:
– Polarity of the Modbus interface connection, are clamps A (+) and B (-) correctly con-
nected?
– Is the correct type of cable being used (see „Installation of the FläktGroup
CET.ACEC compact controller“ on page 14)?
– Is a termination resistor set (see „Modbus Network“ on page 14)?
Switch Setting Explanation
10 to 30 °C
The setpoint of the room temperature is specified with the rotary switch .
1)
Default setting: 10 to 30 °C
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