Vacuum Switch 1.5" Hg 1/4" FPT – OEM Replacement Part
Part Number: 1404
Category: Pressure Washer Components → Vacuum Switches → Electrical Control Components
Type: Vacuum Switch 1.5" Hg 1/4" FPT
The Vacuum Switch 1.5" Hg 1/4" FPT is an OEM pressure-sensing control device designed to monitor inlet vacuum conditions in pressure washer systems and automatically control burner operation. Installed on the pump inlet line, this vacuum switch helps ensure safe burner activation by detecting water flow through the system and completing the burner control circuit only when adequate suction is present.
Key Features & Benefits
- OEM replacement vacuum switch
- Activates burner systems based on inlet vacuum conditions
- Helps verify water flow before burner operation
- Pressure-responsive diaphragm design
- Automatically opens and closes electrical circuits
- Supports safe burner control operation
- Designed for electric pressure washers up to 3 GPM
- Helps prevent unnecessary burner operation when flow stops
- Compact and durable construction
- Ideal for hot water pressure washer systems
Technical Specifications
Product Type: Vacuum Switch
Vacuum Rating: 1.5" Hg
Connection Size: 1/4" FPT
Thread Type: Female Pipe Thread (FPT)
Maximum Flow Application: Up to 3 GPM
Maximum Temperature: 140°F
Weight: 1.2 lbs.
Equivalent Part: 0001 Vacuum Switch
Application: Burner & Flow Control
OEM Replacement: Yes
Typical Applications
- Electric pressure washers
- Hot water pressure washers
- Burner control systems
- Fuel solenoid control circuits
- Water flow verification systems
- Commercial cleaning equipment
- Industrial pressure washing systems
- Pump inlet monitoring applications
Performance Advantages
- Helps ensure burner operation only when water flow is present
- Automatically interrupts burner operation when flow stops
- Improves system safety and efficiency
- Reliable diaphragm-operated switching mechanism
- Supports proper hot water pressure washer operation
- Helps reduce unnecessary burner cycling
- Durable construction for commercial environments
- Easy integration into existing burner control systems
- Essential component for many hot water pressure washers
Important Operating Note
A potential issue can occur if the inlet filter, supply line, or float tank becomes restricted or clogged. In this situation, the pump may continue running while creating excessive vacuum on the inlet side. This vacuum condition can keep the switch closed and allow burner operation even though water supply is inadequate.
For proper operation:
- Inspect inlet filters regularly.
- Keep float tanks clean and unobstructed.
- Verify adequate water supply at all times.
- Troubleshoot any inlet restrictions immediately.
Maintenance Recommendations
- Inspect vacuum switch operation during routine service intervals.
- Check electrical connections for corrosion or damage.
- Inspect inlet plumbing for restrictions or debris.
- Verify burner shutdown when water flow stops.
- Replace damaged or malfunctioning switches immediately.
- Follow equipment manufacturer installation and troubleshooting procedures.
