CS400IR-8EC7 (Fisher) LP Gas Regulator-2nd Stage | 1-1/2 FPT | 7.6M BTU | 10-14 Inch WC

Fisher CS400IR-8EC7 Commercial / Industrial Second Stage LP Gas Regulator

The Fisher CS400IR-8EC7 is a high-capacity, second-stage LP gas pressure regulator designed for commercial and industrial propane applications requiring reliable pressure reduction and consistent downstream gas delivery.

Part of the Fisher CS400 Series, this direct-operated, spring-loaded regulator provides a maximum rated propane capacity of 7,600,000 BTU per hour and features 1-1/2 inch FNPT inlet and outlet connections for integration into commercial gas distribution systems.

The regulator is factory-set at 11 inches water column (WC) and features an adjustable outlet pressure range of 10–14 inches WC, allowing the outlet pressure to be adjusted to meet system requirements.

Engineered for commercial and industrial applications, the CS400IR-8EC7 incorporates internal pressure registration and internal relief functionality in a durable cast iron body.

Key Features

• High-Capacity Performance: Rated for up to 7.6 million BTU/hr of propane flow under specified conditions.
• Second-Stage Pressure Regulation: Reduces intermediate LP gas pressure to low-pressure distribution levels.
• Adjustable Outlet Pressure: 10–14 inches WC, with an 11-inch WC factory setting.
• Large Pipe Connections: 1-1/2 inch female NPT inlet and outlet connections.
• Direct-Operated Design: Spring-loaded mechanism provides responsive downstream pressure regulation.
• Internal Pressure Registration: Monitors downstream pressure internally for regulator operation.
• Internal Relief: Incorporates internal pressure relief functionality.
• Durable Construction: Cast iron body designed for commercial and industrial service.
• Serviceable Design: Pressure adjustment and orifice servicing can be performed using standard tools.

Technical Specifications

Manufacturer	Fisher
Manufacturer Part Number	CS400IR-8EC7
Series	CS400
Regulator Type	Second Stage
Application	Commercial / Industrial LP Gas
Gas Type	Propane (LP Gas)
Maximum Rated Capacity	7,600,000 BTU/hr
Inlet Connection	1-1/2 Inch FNPT
Outlet Connection	1-1/2 Inch FNPT
Orifice Size	3/4 Inch
Factory Outlet Setting	11 Inches WC
Outlet Pressure Adjustment Range	10–14 Inches WC
Maximum Operating Inlet Pressure	20 PSIG
Body Material	Cast Iron
Body Configuration	Side Mount
Pressure Registration	Internal
Relief Type	Internal Relief
Operation	Direct-Operated, Spring-Loaded

Typical Applications

The Fisher CS400IR-8EC7 is suitable for properly engineered commercial and industrial propane distribution systems, including:

• Commercial building LP gas distribution
• Industrial heating equipment
• Large commercial kitchens and food-processing facilities
• Agricultural heating systems
• Warehouses and manufacturing facilities
• Multi-appliance propane installations
• Commercial boiler and furnace systems

Installation and Application Notes

The Fisher CS400IR-8EC7 is intended for use as a second-stage regulator in an appropriately designed LP gas system.

Capacity Note: The rated capacity of 7,600,000 BTU/hr is based on specified inlet pressure and pressure-droop conditions. Actual available capacity depends on operating conditions and system design.

Important: Additional external overpressure protection may be required to comply with NFPA 58 and applicable installation codes. The regulator's internal relief feature should not be assumed to satisfy all overpressure protection requirements.

Regulator selection, sizing, installation, adjustment, and servicing should be performed by qualified LP gas professionals in accordance with Fisher instructions and applicable regulations.