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Common Questions: Is the 621931R a direct replacement for the 621931
making it a staple for contractors managing residential and light commercial HVAC systems
the unit staying in defrost mode too long
weak flame signals
Can the RIBU2SC be used in plenum spaces
Robertshaw 780-502 DSI Module Freon Common Questions: Is the 621931RThe Robertshaw 780 502 is a Universal Direct Spark Ignition (DSI) control module designed for single rod or dual rod sensing applications in natural and LP gas systems. This gas ignition control operates on 24V AC and provides a 4 second Trial For Ignition (TFI) with a single try lockout sequence. As a versatile non prepurge ignition module, it replaces hundreds of legacy Robertshaw and competitive models, including the DS845 and SP715 series. The
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