Honeywell T87K1007 Thermostat selecting the correct orifice is

selecting the correct orifice is vital for maintaining the K-Factor—which for this 5/8" variant is approximately 820—ensuring calibrated flow rates and preventing relief valve nuisance trips or insufficient gas volume during peak demand

35" WC setpoint

Confirm that your existing switch is stamped with 101256-01 or has a set point of 0

By using genuine Modine parts

What are the signs of a failing 89M85 capacitor

Honeywell T87K1007 Thermostat selecting the correct orifice isThe Honeywell T87K1007 is a mercury free, digital round thermostat designed for precision control in 2 wire heat only systems. Operating within a standard 18 30Vac range, this unit utilizes battery assisted power stealing to ensure consistent performance without requiring a common wire, making it a reliable solution for retrofitting older heating systems. The internal thermistor sensor element provides exceptional 1 degree accuracy, maintaining tight