| Abnormal Condition |
Safety Action |
| Low Thermic Fluid Level in Expansion Tank |
Level Switch actuated at expansion tank cuts of the ID Fan / FD Fan. |
| Low Thermic Fluid Flow |
Differential pressure switch (DPS) across inlet and outlet headers cuts of the ID Fan slowing down combustion. |
| Thermic Fluid system pressure high due to system valves closure etc. |
Pressure switch cuts of ID Fan and alarm. Safety relief valve (Optional) to be provided in the system piping so as to bypass the oil. |
| Thermic Fluid Temperature High |
Digital Temperature cuts of ID fan at set point. |
| Coil Chocking |
Differential pressure Switch (DPS) across system cuts of the ID Fan Slowing down combustion. |
| Thermic Fluid Motor Trip |
Electrical Interlock cuts of fans. |
| Power Failure |
Diesel Engine (Optional) keeps Thermic fluid moving to avoid overheating and overflow of oil. Exhaust with Damper provided on furnace to drive away hot gases directly. |
