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GV90+ DWH thermostat leads
I recently had a GV90+4 boiler installed, 4 zones with zone valves (zone 4 is DHW tank). System is using a taco zone controller (pretty sure it's a ZVC404-4). The controller does not have 2 boiler TT end switches (the ZVC404-EXP-4 does), so the contractor left the blue leads for DHW TT (page 58 of Weil-McClein manual) disconnected. Contractor suggested just turning efficiency knob all the way down when walking us through the system after installation, and I think this may be why. This leads me to 2 questions:
- How much efficiency (money) am I giving up by leaving the efficiency knob turned all the way down?
- Could I connect the DWH TT lines to the Zone4 circulator end switch (normally open) contacts? (There is no Zone4 circulator, so those contacts are unused.)