Honeywell EN2H-0221GE51 R0808 ユーザーズマニュアル

SDC / DHC 

Hydraulic Components 

EN2H-0221GE51 R0808 

237 

This function works as described under "Safety temperature 
limiter check", with the following extension: 

As soon as a safety temperature limiter function is detected within 
the BUS system, all consumers (heating circuits) are disabled. 

 

Configuration of cascade control occurs in the central device with 
the bus address 10. If that controller becomes unavailable due to 
some defect, the remaining stages continue operating in an 
emergency mode. In this mode all heat generators adjust to the 
same boiler setpoint temperature (parallel operation). As soon as 
the cascade manager comes back into operation, cascade control 
is reactivated automatically. 

 

To enable the cascade function to process fast switching events, 
the cascade data are transferred with a higher priority. 
Consequently, the data transmission from any device to the 
master device, and of the request values from the master to the 
slave devices, takes no longer than approx. 3 seconds. 

 

The central devices are equipped with a function which ignores 
unused sensors and control functions. Fault messages from non-
connected sensors are not displayed. 

The AUTO SET function is only active at power up. There are two 
possibilities for calling up the AUTO SET function. 

 

If the commissioning date has not yet been stored and the 
corresponding system parameters for activating this function are 
set to ON, connected or disconnected sensors are registered 
automatically whenever the control device is switched on. Fault 
messages from sensors (short-circuit interruption) are suppressed 
in this period. After the commissioning date has been saved, a 
change to the sensor configuration is only still possible after the 
manual SET function. The AUTO SET function can be enabled at 
any time again for a day (day change) using the system 
parameter.