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Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 5648
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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Have a traditional wall mounted Honeywell thermostat which

Customer Question

have a traditional wall mounted Honeywell thermostat which looking to replace with wireless Honeywell cm927. The system is a typical gravity fed std boiler (vaillant ecoplus 428). I have three wires; live, neutral and earth but not sure which goes where in the circuit marked N L L / A B C. Have used before in another house just can't remember the sequence."
Submitted: 1 year ago.
Category: HVAC
Expert:  Phil replied 1 year ago.
Hello,Tell me the voltage measured across all 3 combinations of the 3 wires. We can go from there in the morning. I start at 7 am west coast USA time.

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