amd Posted January 4, 2011 Share Posted January 4, 2011 I am using a C4 thermostat for a heat-only zone (radiant hot water heat for our bathroom). The thermostat has the red wire to RH, the white wire to W1, and the common wire to TS/C. Do I need a jumper between RH and RC? It seems to work fine without the jumper. What is the purpose of the RH to RC jumper mentioned in the installation sheet? I am not clear on whether I need it or not. Link to comment Share on other sites More sharing options...
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