Instruction/ maintenance manual of the product L91D Honeywell
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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.
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 .
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.
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 .
L91A,B,D PROPORTIONING PRESSURETROL ® CONTROLLERS 5 60-2152—0 8 INSTALLATION When Inst alling This Product... 1. Read these instructions carefully .
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.
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.
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.
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.
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 .
L91A,B,D PROPORTIONING PRESSURETROL ® CONTROLLERS 11 60-2152—0 8.
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.
An important point after buying a device Honeywell L91D (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Honeywell L91D yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Honeywell L91D - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Honeywell L91D you will learn all the available features of the product, as well as information on its operation. The information that you get Honeywell L91D will certainly help you make a decision on the purchase.
If you already are a holder of Honeywell L91D, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Honeywell L91D.
However, one of the most important roles played by the user manual is to help in solving problems with Honeywell L91D. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Honeywell L91D along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
