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the 502V coil is wired between terminals 5 and 2
Look for excessive corrosion on the burner ports
A: The Marley Engineered Products 410168002 Thermostat L130F is specifically rated for industrial use and robust enough for commercial heating applications where a 130°F temperature limit is required for safety and equipment protection
the heat relay sequencer is likely the culprit
Robertshaw 710-501 Gas Valve 30067439-890 the 502V coil is wiredThe 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
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