The Barber Colman PF-126 is a floating differential pressure switch designed for use with reversible electric actuated valves, actuators, or sequence controllers to control steam, air, gas, or liquid pressure differentials. Typical applications include positioning of pump bypass control valves to maintain differential in hot water systems.
Technical Specifications
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Model: PF-126
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Type: Floating differential pressure switch
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Switch Action: Single-pole, double-throw (SPDT)
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Electrical Rating: 1.0 ampere at 24 volts, 60 Hz
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Maximum Bellows Pressure: 225 psi
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Differential Setting Adjustment: Each slot of rotation varies the differential approximately 2.25 psi; clockwise rotation increases setting
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Pressure Connections: 1/4-inch tubing with 1/4-inch flare nuts; smaller 3/16-inch tubing may be used with suitable reducers
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Mounting: Universal mounting bracket or direct wall mounting
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Wiring: Terminal block under actuator cover; requires CYZR-818-2 condenser for arc suppression
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Terminal Coding: White is common; red closes on a decrease in differential; blue closes on an increase in differential
Key Features
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Designed for control of steam, air, gas, or liquid pressure differentials
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Suitable for use with TAC reversible actuator control circuits
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Adjustable differential pressure setting
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Universal mounting options
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Includes provisions for arc suppression with CYZR-818-2 condenser
Compatible Applications
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Positioning of pump bypass control valves in hot water systems
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Control of differential pressures in HVAC systems
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Monitoring and controlling pressure differentials in various industrial processes
Installation & Maintenance Notes
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Mount the control in any desired position using the universal mounting bracket or direct wall mounting
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Connect the high-pressure side to the bellows marked “HP” and the low-pressure side to the bellows marked “LP”
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For liquid service, mounting the control above the liquid level is recommended
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Adjust the differential pressure setting using the slotted wheel located under the LP bellows
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Ensure proper wiring connections as per the installation diagram, including the CYZR-818-2 condenser for arc suppression
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Regularly inspect the switch for signs of wear or damage and follow manufacturer guidelines for maintenance procedures
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