What does ZR and ZC mean on an aquastat?
When an aquastat has the ZC and ZR terminals, the ZC is connected to the low temperature switch of the aquastat and to the ZC terminal of the Taco control. The ZR is connected to the ZR. These will be 120 Volt wiring.
How do you test an aquastat on a boiler?
How to Conduct Basic Boiler Aquastat Controller Tests:
- Turn thermostat down – Turn the wall thermostat all the way down so it is not calling for heat.
- Check incoming voltage –
- Check the low voltage transformer output:
- Check thermostat switch terminals:
- Check burner power terminals:
- Check circulator terminals:
How do I troubleshoot my Honeywell aquastat?
Contact Honeywell for assistance if troubleshooting does not resolve the problem.
- Reset or replace the circuit breaker or fuse if the Aquastat has completely lost power and the hot water heater is without power as well.
- Check the high limit set point if the water heater seems to turn off when the water is not very hot.
How do Taco zone valves work?
The Taco Heat Motor Zone Valve is an electricity operated valve used for zone control of Hydronic Heating and/or Cooling Systems. It controls the flow of water in a room or zone in response to the demands of the room or zone thermostat.
How do I know if my taco zone valve is working?
After the thermostat closes, wait for at least 90 seconds and check the meter again. You should see a very low resistance, which means the switch has closed. If the meter reading never changes from OL, the switch isn’t closing and you need to replace the valve head.
How do you test a Taco Zone valve head?
Set a digital multimeter to measure AC volts and connect the leads to the top and middle terminals with alligator clips. Set the thermostat to a high temperature so it will call for heat and close the circuit, and when it does, the meter should read 24 volts or above — the reading is often in the range of 26 volts.