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Dick 9985 X88-43 01/2001 Rev-B 2740 GENERAL INFORMATION GENERAL INFORMATION ATTENTION TEMPEST® DRYER OWNER! Accel Graphic Systems provides parts and service through its authorized distributors and dealers. Therefore, all requests for parts and service should be directed to your local dealer. The philosophy of Accel Graphic Systems is to continually improve all of its products. Written notices of changes and improvements are sent to Accel Graphic Systems' Dealers. If the operating characteristics or the appearance of your product differs from those described in this manual, please contact your local Accel Graphic Systems Dealer for updated information and assistance. Always update your equipment when improvements are made available, especially those related to safety. YOUR AUTHORIZED TEMPEST® DEALER IS: TECHNICAL ASSISTANCE THE SERIAL NUMBER OF YOUR TEMPEST® HOT AIR DRYING SYSTEM IS: CONTROL BOX FAN UNIT For technical assistance during the installation, please contact: ACCEL GRAPHIC SYSTEMS 11103 INDIAN TRAIL Dallas, TX 75229 PHONE (972) 484-6808 FAX (800) 365-6510 E-MAIL accel@dallas.net WEB SITE accelgraphicsystems.com 2 GENERAL INFORMATION GENERAL INFORMATION ELECTRICAL REQUIREMENTS IMPORTANT INFORMATION SAFETY INFORMATION TERMINOLOGY 220 VAC 50/60 HZ 20 AMP DEDICATED LINE NEMA L620R RECEPTACLE The use of heat to accelerate drying may require more frequent lubrication and/or use of a high temperature lubricant in the delivery of the press. Please consult your press manufacturer for specific recommendations. The Tempest® Dryer contains high voltage and hot surfaces. Never attempt to service or work on the unit unless the power is shut off and the unit is cool. Visually inspect the thermistors (Barn housed-shaped objects arranged in a honeycombed pattern on the underside of the unit) weekly. If a thermistor is damaged or cracked, do not operate the dryer. Contact Accel immediately for a replacement part. The fans should be turned on and set at the lowest speed ("0" on the dial) when running spray powder only without heat. This prevents spray powder from accumulating in the thermistors and housings. OPS = Operator's Side NOPS = Non Operator's Side 3 GENERAL INFORMATION GENERAL INFORMATION HOT AIR VS INFRARED WHAT MAKES TEMPEST® WORK Although the technology behind the Tempest® dryer was significant enough to be awarded the GATF Intertech Award, it is by no means new. In fact, thermistors have been in use for many years. They were originally used in motors and other devices as a heat controller and later used in refrigeration to turn compressors on and off. It is only in the last 10 years or so that thermistors have been used as a heater. Heat is generated by the thermistor because of the difficulty of electricity travelling through it when it is a conductor. The thermistor acts as a conductor until it reaches its set temperature and then it becomes a resistor. A thermistor is basically a coated semiconductor designed to switch from a conductor to a resistor at an established temperature. When a current is applied to the thermistor it initially uses a large amount of electricity and heats up very quickly until it reaches its maximum set temperature. At this point it should not use any more electricity. However, air that is passed through the holes in the thermistor causes it to cool. This activates the thermistor to start using more power again so that can get back to its set temperature. The thermistor is constantly regenerating itself to stay at a constant temperature. This process is called autostabilization. Thermistors are also the key element that makes the Tempest® dryer safe. Because the set temperature of the thermistor is lower than the flash point of paper, you can place even the most easily burned substrate (such as tissue paper) on top of the thermistor element without causing a fire. The tissue won't even char, let alone ignite. If you were to do the same with an IR element, a fire could start in a matter of seconds. This is particularly important if a jam occurs in the delivery. The objective of any drying system is to raise the pile temperature to accelerate the drying of the ink. However, heating the paper too much can aggravate problems such as blocking, setoff, mottle, loss of gloss, and loss of halftone definition. Too much heat can also cause the paper to shrink which can cause register problems in multiple pass work. The Tempest® dryer can keep the pile at a lower temperature than IR and still effectively set the ink film. 4 GENERAL INFORMATION GENERAL INFORMATION HOW DRYING IS ACCOMPLISHED WITH TEMPEST® KEY FACTORS TO REMEMBER ABOUT DRYERS FOR SMALL OFFSET PRESSES. IR dryers use very high temperatures and a fixed amount of electricity. One of the drawbacks of using a very hot heat source is that heat wants to travel from a very high temperature to a very low temperature. In other words, the heat generated from an IR dryer will travel to the press wall and attempt to increase its tem...