ATLAS COPCO TCP20P-D Channel isolation card

Operating Controls: Generally pressure or temperature activated, the operating control closes, causing the burner start-up sequence to begin. When the operating control opens, the burner shuts off. The operating control is connected in the L1-3 circuit on the wiring base.Limit Switches: These are generally pressure, water level or temperature activated a. Recycle — when it is desired to stop the burner when the limit switch opens and restart it when the limit switch recloses, they are connected between Terminals L1 and 3. b. Non-Recycle —when it is necessary to stop the burner when the limit switch opens and prevent it from starting until both the limit switch recloses and the manual reset is activated, they are connected between terminals 3 and P.

Fuel Valve End Switch Interlock: 

This is generally an integral switch mounted on the main fuel valve and activated by the valve stem. It is connected between Terminal L1 & 13. The fuel valve end switch interlock prevents a burner start-up if the valve stem is not in the “valve closed” position. This interlock must remain closed while in STANDBY and until the start of PTFI.

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