Mestek j11r06779-002 Air Pressure Switch Gg Series

Product Description

The MESTEK j11r06779-002 is an air pressure switch designed as a standard alternate replacement for GG Series unit heaters rated at 105,000 to 120,000 BTU/h. Air pressure switches monitor combustion air flow in gas-fired heating equipment, proving that the inducer or draft blower is operating before allowing the gas valve to open. This switch is a direct-fit replacement component installed by licensed HVAC technicians during routine maintenance or component failure service calls.

This air pressure switch is intended for use in GG Series gas-fired unit heaters in the 105,000 to 120,000 BTU/h capacity range. GG Series unit heaters are commonly found in commercial and industrial applications such as warehouses, garages, and manufacturing facilities where reliable forced-air heat is required. Installation is performed as a drop-in replacement when the original pressure switch fails to prove airflow or is identified as faulty during system diagnostics.

Key Features

• Listed as standard alternate replacement for GG Series 105-120K unit heaters
• Functions as a safety interlock by proving combustion air flow before gas valve activation
• Direct-fit OEM-style replacement reduces downtime during service calls
• Applicable to commercial and industrial gas-fired heating equipment

Compatibility

Designed as a standard alternate replacement air pressure switch for MESTEK Sterling GG Series gas-fired unit heaters in the 105,000 to 120,000 BTU/h capacity range.

Installation Notes

Installation should be performed by a licensed HVAC technician. Shut off all electrical power and close the manual gas shutoff valve before beginning any work on the unit heater. Reconnect all pressure tubing and electrical connections securely before restoring power and cycling the system to verify proper switch operation. Follow applicable local mechanical codes and manufacturer service documentation throughout the procedure.

Technical Specifications

• Application: GG Series Unit Heaters 105,000 to 120,000 BTU/h
• Component Type: Air Pressure Switch
• Replacement Type: Standard Alternate

Standard Information

• Brand: MESTEK
• Manufacturer Part Number: j11r06779-002