Description
The Reznor 205821 is a factory-specified replacement pressure switch engineered for use with Reznor heating equipment. Designed to monitor and verify proper combustion airflow, this single-pole single-throw (SPST) switch provides dependable draft-proving protection to keep your heating system operating safely and efficiently.
Key Features
- Set point rating of 0.50″ water column (WC) for precise draft sensing
- SPST (Single-Pole, Single-Throw) switching action for straightforward circuit control
- 1/4″ barb port connection for easy hose attachment to pressure tubing
- Direct OEM replacement for compatible Reznor heating units
- Compact design for easy installation in tight equipment spaces
Application
The Reznor 205821 pressure switch is used to prove negative pressure (draft) created by the inducer motor before allowing the main burner to fire. If adequate draft is not established or is lost during operation, the switch opens the control circuit, shutting down the burner and preventing unsafe operation. This makes it a critical safety component in gas-fired unit heaters and other Reznor combustion equipment.
Specifications
- SKU: 205821
- Brand: Reznor
- Switch Type: SPST (Single-Pole, Single-Throw)
- Set Point: 0.50″ WC (Water Column)
- Port Connection: 1/4″ barb
- Application: Draft / combustion air proving
Why Choose the Reznor 205821?
As a genuine Reznor replacement part, the 205821 pressure switch ensures compatibility and performance that aftermarket alternatives may not match. Keeping your Reznor equipment operating with OEM-specified components helps maintain warranty compliance, system reliability, and occupant safety.
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