HVAC: Lockout Relay Explained (ICM220 Lockout Relay Wiring Diagram) Lockout Relay Troubleshooting

HVAC: Lockout Relay Explained (ICM220 Lockout Relay Wiring Diagram) Lockout Relay Troubleshooting / HVAC Relay / Current Relay Explained / Potential Relay Explained / General Purpose Relay Explained / ICM Relay / ICM Timer / ICM Lockout Relay / How Does A Lockout Relay Work
The purpose of the lockout relay is to keep the compressor off when there is a significant fault, EVEN if the fault condition goes back to normal. For example, if a high-pressure switch opens, the lockout relay can keep the system off, even once that switch closes again.
Quite simply, a lockout relay is an old-school way to keep a compressor or other critical component “locked out” so that it doesn't ruin itself by slamming on and off when safeties open and close.
When the relay and safety contacts are closed, the path of least resistance is through the safeties and the contactor coil, so the current takes that low resistance path. When any safety switches open, the current is then FORCED to go through the lockout relay coil because it is the path of least resistance. That then causes the lockout contacts to go open, keeping the contactor coil locked out.
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