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

Hydraulic Components 

SDC / DHC  

140 EN2H-0221GE51 

R0808 

• OpenTherm is the plug & play bus system! 

•  OpenTherm has developed into a standard in heating 

technology. Many gas condensing boilers today feature an 
OpenTherm connection or manufacturers offer an optional 
OpenTherm interface. 

•  The OpenTherm bus uses simple bi-directional 2-wire 

communication between the heat generator and the room 
controller. 

The simple OpenTherm 2-wire bus allows bi-directional 
communication between the room controller and heat generator, 
i.e. data exchange occurs in both directions. 

In use, the simplicity of the OpenTherm system is key. 

The boiler setpoint is transmitted from the SDC controller to the 
automatic stokers via OpenTherm, and feedback of the boiler 
actual value occurs from the automatic stokers (in addition to the 
hot-water actual and outside temperature and fault messages, if 
appropriate). 

Setting in the "Heat Generator" menu, parameter 1, setting 5 
(automatically detected when a heat exchanger bus 
(OpenTherm) is connected (AUTOSET), however). 

If the OpenTherm function is active, the boiler minimum limit is 
automatically set to 5°C. 

To use the OpenTherm function, the boiler must have an 
OpenTherm logo.  

 

 

 

Terminals 37/38 on SDC