User manual GRACO HV-20 63942-1

[. . . ] HV-20/35 Series Proportioning Unit with AmpLok® Operating Manual 63942-1 November 24, 2004 Issue 2 GUSMER CORPORATION ® One Gusmer Drive Lakewood, New Jersey, USA 08701-8055 Toll Free 1-800-367-4767 (USA & Canada) Phone: (732) 370-9000 Fax: (732) 905-8968 Copyright 2004, GUSMER CORPORATION ® http://www. gusmer. com NOTICE: This manual contains important information about your GUSMER equipment. Read and retain for future reference. HV-20/35 Series Proportioning Unit NOTICE: The equipment described in this technical manual must only be operated or serviced by properly trained individuals, thoroughly familiar with the operating instructions and limitations of the equipment. Call: 1-800-FOR-GSMR (1-800-367-4767) for the name and telephone number of your local distributor. NOTICE: All statements, information and data given herein are believed to be accurate and reliable but are presented without guarantee, warranty or responsibility of any kind expressed or implied. Statements or suggestions concerning possible use of GUSMER equipment are made without representation or warranty that any such use is free of patent infringement, and are not recommendations to infringe any patent. [. . . ] The "O1" will continue to cycle on and off, indicating that the controller is maintaining the set point temperature. 3. Figure 18. Temperature Controller WARNING: THE CONTROLLERS ARE FACTORY PROGRAMMED AND ARE NOT FIELD PROGRAMMABLE. IF YOU ENCOUNTER ANY PROBLEMS WITH A CONTROLLER, CONTACT GUSMER FOR A REPLACEMENT. DO NOT SUBSTITUTE A CONTROLLER FROM AN ALTERNATE SUPPLIER AS ITS USE MAY RESULT IN DAMAGE TO THE EQUIPMENT AND/OR BODILY INJURY. 11/24/04 23 HV-20/35 Series Proportioning Unit OPERATION Daily Start-up Procedure IMPORTANT: The Daily Start-up Procedures describe normal operation, assume that all calibrations have been properly executed, and that the heating system is not up to operating temperature. Check the condition of the hydraulic drive and isocyanate lubrication systems and service as required. (See MAINTENANCE beginning on page 37. ) Determine that the supply system is at the proper temperature as recommended by the chemical system supplier, the individual chemicals are properly mixed within their drums/day tanks, and the moisture protection system is properly set for operation. Turn on the main air supply to the transfer pumps and drums/day tanks. If the red emergency stop switch has been activated, reset it by turning the knob clockwise. The light within the switch and the temperature controllers will light up. 8. 9. WARNING: UNCOIL THE HEATED HOSES BEFORE TURNING ON THE HOSE HEATER SWITCH TO PREVENT OVERHEATING THE HOSES AND CREATING HOT SPOTS WITHIN THEM. 10. The light within the switch will light up and the temperature controller should begin to cycle toward its set point. If the set point needs to be changed, see Digital Temperature Controllers on page 23. The lights within the switches will light up and the temperature controllers should begin to cycle toward their set points. Turn off the primary heaters during shutdowns exceeding one half-hour. WARNING: TO PREVENT EXCESSIVE PRESSURE BUILDUP IN THE HEATED HOSES, ALWAYS BRING THE HOSE UP TO THE SET POINT TEMPERATURE BEFORE TURNING ON THE HYDRAULIC SYSTEM. 24 63942-1, Issue 2 Operating Manual Operation 12. One of the amber directional indicator lights will light and the proportioning pumps should move a short distance and pressurize. NOTE: The pump switch must be in the RETRACT or NORMAL position to adjust the hydraulic pressure. 14. After setting the pump switch to NORMAL, monitor both pressure gauges. The resin and isocyanate pressures should be approximately equal and the pressures must remain fixed. Set the pump switch to RETRACT and observe the pressures again; they must remain fixed. If the pressure bleeds off on either stroke, see Proportioning System on page 30 before continuing. To equalize the upstroke pressure, turn the pressure reducing valve counterclockwise until it equals the chemical pressure reading on the down stroke. Consult the spray gun operating manual and test spray as per the directions. Daily Shut-down Procedure 1. [. . . ] The time interval between changes due to gel formation depends on environmental conditions in which the equipment is operating. The enclosed lubrication system of the HV-20/35 minimizes exposure to moisture, but moisture contamination is still possible. Discoloration of the pump lubricant is due to continual seepage of small amounts of isocyanate past the pump packing during operation. However, if the packing within the isocyanate pump is functioning properly, lubricant replacement due to discoloration should not be more frequent than 3 or 4-week intervals. [. . . ]