Johnson Controls P47AA-1C Penn Series P47 Steam Pressure Limit Control 0-15 PSI SPST

The Johnson Controls P47AA-1C is a Penn Series P47 Steam Pressure Limit Control designed for high-limit and operating control applications in steam heating systems. With a pressure range of 0 to 15 PSI, this control helps protect boilers and steam systems from over-pressurization by opening its contacts when pressure rises above the set point.

This unit features an SPST (Single-Pole, Single-Throw) switch configuration with contacts that open on a pressure rise and automatically reset when pressure returns to a safe level. It connects via a 1/4 in. external NPT pressure fitting and is compatible with steam, water, air, or non-combustible gases that do not harm iron or copper.

Key Features:

• Pressure range: 0 to 15 PSIG
• Adjustable differential: 2 to 8 PSI
• Maximum allowable pressure: 50 PSI
• Switch type: SPST — contacts open on pressure rise
• Reset type: Automatic reset
• Pressure connection: 1/4 in. external NPT
• Electrical rating: 120/208/240/277 VAC
• Full load amps: 22A @ 120/208/240 VAC
• Locked rotor amps: 96A @ 120V
• Minimum wire size: 22 AWG
• Agency compliance: UL Listed (UL Guide No. MBPR, File MP640)

The P47AA-1C is ideal for use as a high-limit safety control on steam boilers and steam heating systems. It can also be applied to steam unit heaters and other HVAC systems where pressure monitoring and protection are required. Compatible with steam, water, air, and non-combustible gases.