Description
The Armstrong Furnace R100811-09 is an OEM-grade L195F manual reset (M/R) limit switch engineered to protect Armstrong furnaces from dangerous overheating conditions. When supply-air temperatures reach the 195°F trip point, this limit switch interrupts the burner circuit and requires a deliberate manual reset before the furnace can resume normal operation — a critical safety feature that prevents repeated cycling into an unsafe condition without technician intervention.
Key Features
- 195°F (L195F) fixed trip-point for precise high-limit protection
- Manual reset (M/R) design requires intentional reset after trip, preventing automatic restart into an unsafe condition
- OEM replacement part engineered specifically for compatible Armstrong furnace models
- Reliable bimetal sensing element for accurate, repeatable temperature response
- Compact form factor for straightforward drop-in installation
Why Manual Reset Matters
Unlike automatic-reset limit switches, a manual reset switch demands that a qualified technician identify and correct the root cause of overheating before restoring furnace operation. This safeguard helps prevent heat exchanger damage, flue gas spillage, and fire hazards associated with repeated high-limit trips.
Application
- Direct OEM replacement for Armstrong furnaces specifying part number R100811-09
- Suitable for residential and light-commercial forced-air heating systems
- Ideal for service calls involving nuisance high-limit trips or failed limit switch diagnostics
Installation Notes
Always de-energize the furnace before replacing any limit switch. Verify the replacement part number against the furnace data plate or wiring diagram. After installation, investigate and resolve any underlying airflow restrictions, dirty filters, or blocked heat exchangers that may have caused the original limit trip.
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