and 101A series units

Look for signs of "sooting" around the flue pipe transition

Simplifies thermocouple wiring and diagnostics in complex combustion safety circuits

and 0-75 PSIG

it facilitates the essential transition between heating and cooling cycles by reversing the refrigerant flow direction through the indoor and outdoor coils

Resideo VR8304M2501 Valve 320074-702 and 101A series unitsThe Resideo VR8304M2501 is a single stage gas valve engineered for precision in high capacity heating applications. This intermittent pilot dual automatic valve features a standard opening characteristic with a rated capacity of 240,000 BTU hr (at 1 in. wc p. d.), making it a reliable choice for commercial and residential appliances requiring robust fuel control. The VR8304M2501 operates on a 24VAC gas valve circuit and maintains a factory set 3. 5