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Honeywell L91D manual

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Table of contents for the manual

  • Page 1

    PRODUCT DAT A Put UPC Code Here 60-2152—08 L91A,B,D Proportioning Pressuretrol ® Controllers APPLICATION L91 Proportioning Pressure trol ® Controllers are Series 90 Modulating Pressure Controllers that provide direct control of modulating motors or valves used on automatic burners or steam heating systems. FEATURES • Models available for pres[...]

  • Page 2

    L91A,B,D PROPORTIONING PRESSURETROL ® CONTROLLERS 60-2152—0 8 2 ORDERING INFORMATION When purchasing replacement and modernizat io n products from your TRADELINE® whol esaler or distributor , refer to the TRADELINE® Catalog or price sheets for complete ordering number . If you have additional questions, need further information, or w oul d lik[...]

  • Page 3

    L91A,B,D PROPORTIONING PRESSURETROL ® CONTROLLERS 3 60-2152—0 8 Electrical C onnections: Internal screw terminals. Hole inside of case for 1/2 in. conduit. Dimensions: See Fig. 1; see Fig. 2 for mounting steam trap (siphon loop). Weight: 1 lb, 15 oz (0.88 kg). Finish: Gray . Replacement Parts: 129178 Thermoplastic C over . 23176CB Potentiometer:[...]

  • Page 4

    L91A,B,D PROPORTIONING PRESSURETROL ® CONTROLLERS 60-2152—0 8 4 Fig. 1. Moun ting dimensions o f the L91 Propo rtional Pressure trol ® Controllers, in in . (mm). M29781 L91A,B,D ALL OTHER MODELS 10 TO 300 PSI 0 TO 15 PSI 0 TO 16 OZ/IN 2 1/4-18 NPT DIM A (SEE T ABULA TION T ABLE) DIM B (SEE T ABULA TION T ABLE) DIM C (SEE T ABULA TION T ABLE) 1 [...]

  • Page 5

    L91A,B,D PROPORTIONING PRESSURETROL ® CONTROLLERS 5 60-2152—0 8 INSTALLATION When Inst alling This Product... 1. Read these instructions carefully . Failure to follow them could damage the product o r cause a hazardo us condition. 2. Check the ratings given in the instructions and on the product to make sure the product is suitable for your appl[...]

  • Page 6

    L91A,B,D PROPORTIONING PRESSURETROL ® CONTROLLERS 60-2152—0 8 6 Fig. 3. L91 termina l blocks and internal schema tics. WIR IN G 1. Disconnect power supply before beginning installation to prevent electric shock and equipment damage. All wiring must comply with applicable electric al codes, ordinances, and regula tions. Use NEC Class 1 (lin e vol[...]

  • Page 7

    L91A,B,D PROPORTIONING PRESSURETROL ® CONTROLLERS 7 60-2152—0 8 point). The L91B settings pr ovide system modula tion between 70 and 75 psi or between 75 and 80 psi, depending on the exact setting of the L91 B main scale setpoint. Due to device tolerances, the scaleplate settings a re approximate and, therefore, the settings should be fine-tuned[...]

  • Page 8

    L91A,B,D PROPORTIONING PRESSURETROL ® CONTROLLERS 60-2152—0 8 8 CHECKOUT After the controller is installed, wired, and set, it should be tested with the system in operation. First, allow th e system to stabilize. Then, observe the oper ation of the controlle r while raising and lowering its setpoint. Pressure should increase when the setpoint is[...]

  • Page 9

    L91A,B,D PROPORTIONING PRESSURETROL ® CONTROLLERS 9 60-2152—0 8 SERVICE INFORMATION CAUTION Electrical Shock Hazard 1. Only qualified servi ce technicians should a ttempt to service or repair flame safeguard controls and burner systems. 2. Disconnect power su pply before cleaning the potentiometer wi ndings or wiper, or before replacing the cont[...]

  • Page 10

    L91A,B,D PROPORTIONING PRESSURETROL ® CONTROLLERS 60-2152—0 8 10 Fig. 8. Removing ter minal block bracket. Fig. 9. Replaci ng potentiomet er in L91. Fig. 10. Replacing terminal block brack et. DIFF . MAIN MIN B D F E C A 0 4 6 2 1 3 4 5 16 14 12 10 8 0 kPa OZS IN 2 DIFF . IS ADDITIVE 2 6 7 M8521A REMOVE BRACKET SCREW FROM TOP OF CASE TERMINAL BL[...]

  • Page 11

    L91A,B,D PROPORTIONING PRESSURETROL ® CONTROLLERS 11 60-2152—0 8[...]

  • Page 12

    L91A,B,D PROPORTIONING PRESSURETROL ® CONTROLLERS Automation and Control Solutions Honeywell Internationa l Inc. 1985 Douglas Drive North Golden Valley, MN 55422 Honeywell Limited-Honeywell Limitée 35 Dynamic Dr ive Toronto, Ontario M1V 4Z9 customer.honeywell.com ® U.S. Registered T rademark © 2009 Honeywell Internationa l Inc. 60-2152-—08 K.[...]