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Relays and Control Modules

RP922

A three-port pneumatic potentiometer can sum two input pressures, average two input pressures, be an adjustable flow restriction, or be an adjustable pressure supply. Replacement devices are available for Johnson, Powers, Robertshaw, Barber-Colman, and older Honeywell devices.

RP970

Direct acting, modulating relay provides increased capacity of the branchline pressure to the final control device. Replacement devices are available for Johnson, Powers, Robertshaw, Barber-Colman, and older Honeywell devices.

RP971

A four port non-bleed pneumatic relay which produces a modulating pressure output, proportional in a fixed ratio to pilot input changes. It is used to control pneumatic valve or damper actuators in sequence from a single thermostat. Replacement devices are available for Johnson, Powers,...

RP972

A modulating relay suitable for all types of heating and air conditioning control systems to reverse and increase the capacity of the branchline pressure to the final control element. The output varies inversely with the input with an adjustable offset. Replacement devices are available for...

RP973

A three-port relay used in HVAC systems averages the signals from two thermostats to control a single device such as a heating coil valve for a multizone unit. The pneumatic averaging relay provides an output pressure equal to the average of two input pressures. Replacement devices are available...

RP975

A three-port hesitation relay provides minimum outside air damper position plus controlled ventilation for large volume unit ventilators. Replacement devices are available for Johnson, Powers, and Barber-Colman devices.

S-224

The S-224 Pneumatic Gradual Switch provides manual selection of the pressure in air lines from a remote location. The S-224 is a proportional action relay type switch, which will maintain a selected output pressure setting until it is readjusted. Refer to S-224 Pneumatic Gradual Switch Product...

S-2300

The S-2300 Pneumatic Selector Switch provides manual switching of air in pneumatic control systems.
Refer to S-2300 Pneumatic Selector Switch Product Bulletin (LIT-7171380) for important product information.

S510, S511 Series (2390 Series)

The S510 gradual switch is designed to allow manual setting of a desired pressure, up to main air pressure, where the application requires remote positioning of final control devices or remote control point adjustment of a pressure signal is desired. The S511-5 and S-511-10 have been designed...

S515 (2390-515)

The S515 pressure regulator allows the manual setting of any desired air pressure, up to main pressure, where the application requires remote positioning of final control devices, remote control point adjustment of receiver controllers, or any other application where manual setting of an output...

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