CALEFFI Z-one Relay Multi-Zone Valve Control ZVR10X Series Hot Rod are you out there

cutter

I am using the control panel listed above. It appears the light comes on saying a zone needs heat but the pump controlling the zone does. That same pump supply's water to 4 zones. So if another zone wants heat at the same time the pump supply's water to both zones. But if the other 3 zones are satisfied the pump does not run. the indicator red light on the panel says the zone needs heat but the pump does not run. I have sensors showing the supply and return water temperature. I noticed today the supply and return was the same temperature.. Only one zone was calling for heat, I then turned up another thermostat and the return temp went down. I could hear the pump run then. when the supply and return was the same temperature I could not hear the pump. I would say the control panel is getting tired. I am not as sharp as most of you folks. I changed that pump last week think the pump was the problem. being as how the pump was new I figured something else was the problem so now I feel the control panel is not doing it's job 100%. Anybody have suggestions or comments.

hot_rod

Which pump connection are you using? Is there a priority zone? If not dip switch for priority to no.

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cutter

I don't remember when I re-piped this system and used all Caleffi controls. At least 6 years ago. the system has worked flawless until now. The screen shots and the information confuses me. When a zone calls for heat and the zone valve opens but the pump does not come on something is wacko. if another zone calls for heat the second zone valve opens and the pump comes on and supply's water for both zones. so something is not working quite right.

pedmec

Your zone valve is most likely not functioning. Zone valves have end switches to relay back to the ZVC to indicate the valve is opened and you can turn the circulator on. it's to prevent your circulator from deadheading. are you getting heat to all zones when the working zones are functioning. does the second zone light come on when you turn the thermostat up?

hot_rod

With the cover off you can see both lights. One light indicates the thermostat is calling. The second will come on after the zone valve end switch closes. Depending on the zone valve it could take 45 seconds with a motorized valve, or maybe 3 minutes with a thermal actuator.

If the second light does not come on, the end switch is not closing.

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