Harman 3-20-6866 (SRV8320-003) Vacuum Differential Pressure Switch

Our Harman 3-20-6866 Vacuum Shut-Down Switch is a High Quality Vacuum Switch used in Heatilator (EcoChoice) and other pellet stoves & inserts.

The Air Pressure Vacuum Switch acts as a safety mechanism to ensure proper temperature & airflow within the combustion and venting chamber.

This 3-20-6866 Harman Differential Pressure Switch (Vacuum Shut-Down Switch) is compatible with these Pellet Stove Brands

• (3-20-6866) Harman
• (3-20-6866) Heatilator
• (3-20-6866) Eco Choice
• (SRV8320-003) Harman
• (SRV8320-003) Hearth and Home Technologies
• (3-20-9301) Harman
• (3-20-9301) Hearth and Home Technologies

This 3-20-6866 (SRV8320-003) Harman Vacuum Shut-Down Switch (Differential Switch) is compatible with these Harman models

• Harman - XXV-TC - 3-20-6866
• Harman - HF60 - 3-20-6866
• Harman - PF100 - 3-20-6866
• Harman - PB105 - 3-20-6866
• Harman - Allure 50 - 3-20-6866
• Harman - XXV Pellet Stove - 3-20-6866
• Harman - Advance - 3-20-6866
• Heatilator (EcoChoice) - BH105 - Differential Switch - 3-20-6866
• Harman - P43-C Pellet Stove -SRV8320-003
• Harman - P38 Pellet Stove - SRV8320-003
• Harman - XXV-TC (Freestanding Pellet Stove) - Differential Switch - SRV8320-003
• Harman - P35i-C - Differential Switch - SRV8320-003
• Harman - PC45 - (Differential Switch - 3-20-9301)
• Harman - Accentra-2 - (Differential Switch - 3-20-9301)

Included with Vacuum Switch (Differential Switch)

• 3-20-6866 Air Pressure Vacuum Switch for Pellet Stoves
• 1 Year Comprehensive Warranty

A pellet stove Vacuum Switch (Differential Pressure Switch), also known as an (Air Pressure switch or Draft Switch) works by registering the pressure difference in the heat creation system, through a hose connected to the combustion chamber and/or exhaust system.
The vacuum switch is a safety device that detects negative pressure created by the exhaust fan, as it pulls air through the stove’s venting chamber.
A faulty vacuum switch may cause the auger to stop feeding pellets into the combustion chamber, causing the stove to shut down. A blocked hose, dirty stove or clogged vent can also trigger the Air Pressure Vacuum Switch to halt the heat creation process.