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Pneumatic Relays

RP418

RP418

Electrically operated pneumatic switches used to interlock an electrical system and a pneumatic control system. Replacement devices are available for Johnson, Powers, Robertshaw, Barber-Colman, and older Honeywell devices.

RP470

RP470

Three-port relays are used in HVAC systems, to perform a variety of relay functions, such as; transmit the higher of two input signals, lock out one pressure signal when a second signal is higher, or transmit the lower of two pressure signals.

RP471

RP471

The four port, snap acting relay, converts a proportional air pressure change, from a controller to a positive (two-position) pressure change. It can also divert a supply line to one of two branches.

RP670

RP670

Pneumatic relays block, divert, or bleed pneumatic air lines when pilot pressure is changed between values. Commonly applied in Day-Night, Summer-Winter, Start-Stop, On-Off-Auto and other multiple condition systems.

RP818

RP818

Electrically operated pneumatic switches used to interlock an electrical system and a pneumatic control system. Replacement devices are available for Johnson, Powers, Robertshaw, Barber-Colman, and older Honeywell devices.

RP913

RP913

A diaphragm logic pressure selector selects the highest/lowest branch pressure input from zone thermostats to operate final control elements in pneumatic control applications. Replacements available for Johnson, Powers, Robertshaw, and Barber-Colman.

RP922

RP922

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

RP970

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

RP971

Pneumatic relay produces a modulating pressure output, and controls pneumatic valve or damper actuators in sequence from a single thermostat. Replacements are available for Johnson, Powers, Robertshaw, Barber-Colman, and older Honeywell devices.

RP972

RP972

RP972 is a modulating relay suitable for all types of heating and air conditioning control systems, to reverse and increase the capacity of branchline pressure to an element. The output varies inversely with the input with an adjustable offset.

RP973

RP973

A three-port relay averages the signals from two thermostats to control a single device such as a heating coil valve for a multizone unit. Replacements available for Johnson, Powers, Robertshaw, Barber-Colman, and olderHoneywell models

RP975

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.