Carrier HK06NB065 Pressure Switch SPST CLS 0.8″ WC

Description

Carrier HK06NB065 Pressure Switch Overview

The Carrier HK06NB065 is an OEM replacement pressure switch engineered for use in Carrier furnaces and air handlers. Designed as a Single Pole, Single Throw (SPST) normally open switch, it closes at a setpoint of 0.8″ WC (inches of water column), confirming proper inducer draft before allowing the ignition sequence to proceed. This switch plays a critical role in furnace safety — preventing ignition if adequate negative pressure is not established in the flue system.

Key Features

• OEM Carrier replacement pressure switch — ensures precise fit and function
• SPST (Single Pole, Single Throw) configuration for straightforward circuit control
• Closes (CLS) at 0.8″ WC — activates when draft pressure reaches the required setpoint
• Monitors inducer motor operation to verify proper venting before ignition
• Protects against unsafe combustion conditions caused by blocked flues or failed draft inducers
• Direct OEM replacement for compatible Carrier heating equipment

How It Works

The pressure switch is connected to the furnace’s inducer assembly via a rubber hose. When the inducer motor runs and creates sufficient negative pressure (0.8″ WC), the diaphragm inside the switch deflects and closes the SPST contacts. This signals the control board that safe draft conditions exist and allows the heating cycle to continue. If the required pressure is not achieved — due to a blocked vent, failed inducer, or collapsed hose — the switch remains open and locks out ignition, safeguarding the system and occupants.

Application

• Carrier gas furnaces requiring a 0.8″ WC draft pressure switch
• Direct OEM replacement for failed or out-of-spec pressure switches
• Ideal for HVAC technicians performing routine maintenance or troubleshooting no-heat calls

Specifications

• SKU: HK06NB065
• Brand: Carrier
• Switch Type: SPST (Single Pole, Single Throw)
• Switch Action: Closes (CLS) on rising pressure
• Setpoint: 0.8″ WC (inches of water column)
• Application: Gas furnace draft/inducer pressure sensing