Old (1955?) Honeywell (actually M-H) stat T42A1X3 at church. Did an off-line checkout, painted bellows with hot/cold water and checked action and contacts. All OK. When I hooked it back up, it seemed to have a dead-band of about 3 degrees. Obviously, no anticipation, where did the deadband come from? This thing even has a little copper spring designed to prevent slop in the mercury switch. I looked at the action and saw no adj. for deadband, can I minimize this?
Tim S.