BTH ULTRA Electric Boilers Installation & Operation manual (Revision: May 2015)
13
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o If the installation is made as shown on fig.8
then with a three way valve (in Option):
Install a three wire 18ga cable between the
valve and the electric boiler terminals.
Following this, connect the end switch of the
valve (grey and orange wire) to the T T
terminals of the auxiliary boiler.
The auxiliary boiler target temperature will not be
controlled by the electric boiler. It has to be
controlled by its own operating and limit controller.
Figure 12 : Connexions with three way valve
Figure 13 : Wiring diagram (12-24 KW)
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