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Hello, I have a Navien NCB 240 and have recently hooked up a Taco ZCV-404-EXP, my problem is my sentry zone valves only work if I only use the first two wires 1-2 and then jumper the 3-4 at the zone control, when I connect 4 wires , after the zone valve opens everything shuts down, then the valve closes. are these sentry valves not 4 wire? Also when I switch the dip to post purge operation on it's supposed to keep the zone output energized for two minutes after there is no call for heat, but not operate the boiler,...in my case the boiler is still running for the two minutes....I hooked everything up according to the manual,....is it as simple as reversing the TT conections?