Robertshaw 710-501 Gas Valve 30067439-890 Broad Compatibility: Matches with Armstrong

Broad Compatibility: Matches with Armstrong Air BCS2 blower coils and EFC/EFV air handler series

the heat relay sequencer is likely the culprit

These part numbers refer to the same technical component

The Cleveland Controls NS2-0000-01 is a versatile differential pressure switch engineered for sensing air flow in HVAC and energy management applications

the 0453H0074GA00 model ensures a fail-safe return to the normal position upon power loss

Robertshaw 710-501 Gas Valve 30067439-890 Broad Compatibility: Matches with ArmstrongThe Robertshaw 710 501 Millivolt Gas Valve is a reliable low profile gas control designed specifically for space heating applications where space is at a premium. This non regulated Robertshaw valve features a 1 2" NPT inlet and a 1 2" NPT outlet, delivering a capacity of 150,000 BTU. Engineered for millivolt replacement projects, it functions without external power by utilizing the millivoltage generated by a standing pilot thermopile. The 710 501