Computherm E300 - Connecting Devices to be Controlled

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stat and the apparatus to be controlled are de-energized
while putting them into operation. The device should be
installed and put into operation by a competent person!
Ifyoudonot possess thenecessaryskills and qualica-
tions,pleasegetintouchwithanauthorizedservice.
Caution! The modication of the device poses a risk of
electricshockorbreakdown!
6.1. Connection of the device(s) to be controlled
Forcontrollingaone-zoneheatingsystem
The devices to be controlled should be connected to the ter-
minal block located on rear side of the product. In the thermo-
stat there are two potential free relays whose normally-opened
connection points are at legends COM-NO (3-4) and K2 (8-
9) of the terminal block. When the thermostat gives a switch
signal then it will switch both potential free relays, and closes
the two connections points of COM-NO(3-4)andK2(8-9) sep-
arately. Device(s) to be controlled should be connected here.
For controlling gas boilers the connection points of the boiler
thermostat should be connected to COM-NOor K2 connection
points of COMPUTHERM E300 (Figure3). If the device to be
controlled has no thermostat connection point, the power sup-