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Yes, replaced the ep2002 for an ep200. Fully pumped system but maybe two port valve. Is there a difference on the wiring?

I have replaced my EP2002 timer with an EP200. The EP2002 backplate had 5 connections with terminals 1 and 5 linked. Yellow and Red wires on terminals 3 & 4 respectively (nothing on terminal 2). The new timer only has 4 connections where the yellow wire goes to terminal 4 for CH and the red...