Honeywell L91B, L91D

L91A,B,D PROPORTIONING PRESSURETROL® CONTROLLERS

11 60-2152—08

Contents

Main PRODUCT DATA L91A,B,D Proportioning Pressuretrol Controllers APPLICATION FEATURES Contents ORDERING INFORMATION SPECIFICATIONS Page L91A,B,D PROPORTIONING PRESSURETROL CONTROLLERS Fig. 1. Mounting dimensions of the L91 Proportional Pressuretrol Controllers, in in. (mm). L91A,B,D INSTALLATION When Installing This Product... WARNING Location and Mounting Mounting Beside a Pressure Gauge Mounting on a Boiler Mounting at a Remote Location WIRING Setting Main Scale Set Point (All models) Use of L91 Proportioning Controller with Limit Controllers Proportioning Range (L91B,D Only) Typical Operation CHECKOUT If a Controller Seems to Operate Improperly CAUTION SERVICE INFORMATION CAUTION Calibration Maintenance Cleaning the Potentiometer Windings or Wiper Replacing the Controller Potentiometer (Fig. 810) L91A,B,D PROPORTIONING PRESSURETROL CONTROLLERS Fig. 8. Removing terminal block bracket. Fig. 9. Replacing potentiometer in L91. Fig. 10. Replacing terminal block bracket.