7135U Cad Cell with 54" Leads – OEM Replacement Part
Part Number: 3302
Category: Pressure Washer Parts → Burner Components → Cad Cells & Flame Sensors
Type: 7135U Cad Cell with 54" Leads
The 7135U Cad Cell with 54" Leads (Part #3302) is a genuine-style replacement flame sensor designed for oil burner systems used in hot water pressure washers, heating equipment, and industrial combustion applications. This critical safety component monitors burner flame presence and works with the primary burner control to ensure safe and reliable burner operation.
Key Features & Benefits
- OEM replacement cad cell flame sensor
- 54" wire leads for flexible installation
- Cadmium sulfide sensing element for rapid flame detection
- Faster response than traditional bimetal sensors
- Signals burner shutdown during flame failure
- Hermetically sealed glass-to-metal construction
- Resistant to humidity, soot, and oil fumes
- Plug-in design for easy replacement
- Recessed sensing element improves flame sighting
- Helps maintain safe burner operation
Technical Specifications
Part Number: 3302
Model: 7135U
Product Type: Cad Cell Flame Sensor
Lead Length: 54"
Sensor Type: Cadmium Sulfide (CdS)
Construction: Hermetically Sealed Glass-to-Metal
Connection Style: Plug-In
Application: Flame Detection & Burner Safety Monitoring
OEM Replacement: Yes
Compatible Applications
Commonly used in:
- Hot water pressure washer burners
- Oil-fired burner systems
- Beckett burner assemblies
- Commercial heating equipment
- Industrial burner systems
- Fuel oil combustion equipment
- Mobile wash rigs
- Fleet washing systems
- Commercial cleaning equipment
- Industrial maintenance applications
Common Signs of Cad Cell Failure
A replacement cad cell may be needed if you notice:
- Frequent burner lockouts
- Burner shuts down unexpectedly
- Flame sensing errors
- Intermittent burner operation
- Delayed burner startup
- Excessive soot buildup on sensor
- Damaged or deteriorated wiring
- Inconsistent flame detection
Performance Advantages
- Rapid flame detection improves burner safety
- Helps prevent unsafe fuel accumulation
- Supports reliable burner operation
- Hermetically sealed design resists contamination
- Improves burner system reliability
- Reduces false shutdowns caused by sensor deterioration
- Long lead wires simplify installation
- Plug-in design speeds maintenance and replacement
- Suitable for demanding commercial applications
Installation Instructions
- Disconnect power to the burner system.
- Allow burner components to cool completely.
- Locate and remove the existing cad cell.
- Disconnect the sensor leads from the primary control.
- Install the replacement 7135U cad cell.
- Route and connect the 54" leads according to burner specifications.
- Verify proper sensor positioning and flame visibility.
- Restore power and test burner operation.
- Confirm proper flame detection and burner safety functions.
Note: Always verify proper burner operation after replacing flame-sensing components.
Maintenance Recommendations
- Inspect the cad cell during routine burner service.
- Keep the sensor viewing area clean and unobstructed.
- Remove soot or debris buildup as necessary.
- Check wiring for wear or damage.
- Verify proper flame sighting alignment.
- Replace deteriorated sensors promptly to maintain burner safety.
