RAM-4 Hot Surface Ignition Control Zoom

RAM-4 Hot Surface Ignition Control


Brand: Robertshaw

Qty Price
/ each
$329.85 / box (3 units x $109.95)
Non-Stock ItemAllow 2-3 Weeks to Ship Out



Ignition Type: Intermittent Hot Surface Pilot

Description for Robertshaw 790-400

The RAM hot surface ignition controls are 24 VAC. When the thermostat calls for heat, RAM's HSI control simultaneously energizes the hot surface ignitor and initiates current sensing function. Gas valve(s) remain closed until current sense threshold is reached. Once the current draw threshold has been reached or exceeded, the gas valve(s) and flame rectification circuits are energized. Upon proof of flame, the hot surface ignitor is shut off. Main burner flame is continuously monitored. Loss of flame detection results in RAM-H cycling to check the current draw of the hot surface ignitor. If the hot surface ignitor is below the current draw threshold, the gas valve(s) will remain off and the hot surface ignitor will remain on until the current threshold is reached


  • Infinite Ignition Attempts before Lockout
  • 120v
  • Non Prepurge

RAM-4 Hot Surface Ignition Control

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