HoneywellHoneywell L91 Series Proportional Pressuretrol Controller

Honeywell L91 Series Proportional Pressuretrol Controller

L91 Proportioning Pressuretrol Controllers are Series 90 Modulating Pressure Controllers that provide direct control of modulating motors or valves used on automatic burners or steam heating systems.

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Honeywell L91 Series Proportional Pressuretrol Controller Honeywell L91 Series Proportional Pressuretrol Controller

Models available for pressure systems up to 2068 kPa (300 PSI)

May be used with steam, air, noncombustible gases, or other fluids noncorrosive to brass or phos-bronze (300 psi model)

When used with steam boilers, a steam trap (siphonloop) is recommended

Wiper on controller potentiometer moves in response to pressure changes

L91D has two potentiometers for unison control of two motors

L91B,D models have adjustable proportioning (throttling) range to allow selection of desired pressure control range

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