AOCH & AOCHM Series installation & maintenance
We suggest a mild water-soluble degreaser be used with a brush. Tubing I.D. is aproximatley .325 a plastic bristle brush on a rod will work best for cleaning the tubes . Steel brushes should be avoided since the steel is harder than the copper tubing and may heavily score the tubes if used. g) If there are any leaking tubes you may plug them by carefully forcing a soft metal plug into the hole and tapping it tight. You may in some cases weld the leaking tube shut however, care should be taken since excessive heat may cause surrounding tube joints to loosen and leak. h) When finished cleaning or repairing, be sure to re - place ALL of the turbulators back into any open tubes . When the turbulators protrude from the opposite end flatten them again so they are tight and cannot be removed. i) When finished reattach the manifold covers in the same position they were removed, using new gaskets , bolts , and hardware. We suggest using a torque wrench to final tighten the bolts . j) Torque Specifications: For 5/16" bolts 22-23 ft-lbs, for 3/8" bolts to 38-42 ft-lbs. Since bolts and hardware can physically fatigue during application we suggest new bolt kits be used when reassembling.
Serviceable Core ® Maintenance Units containing a Serviceable Core ® have bolted mani- fold covers that can be removed for cleaning or repair purposes. Servicing Sequence American Industrial has gone to great lengths to provide components that are repairable. If the heat exchanger core requires internal cleaning or attention the following steps will explain what must be done to access the internal tubes. Be sure to order gasket kits or repair parts prior to removal and disassembly to minimize down time. a) To clean the internal tubes first remove all connection plumbing from the unit. b) Be sure the unit is drained of all water etc... c) Place the heat exchanger in an area that it can be ac- cessed from all sides. Remove the core from the cabinet if required (AOCH, AOCS). d) Mark the cover and tube-sheet for both covers so that they can be replaced into the same position when finished. Remove the manifold cover bolts and hardware and place them into a secure place. e) The manifold covers are tightly compressed and may need some prying to separate them from the gasket , physically remove the cover assemblies from both sides. f) The tubes and turbulators are now accessible for cleaning. Note: turbulators are installed on AOCH & AOCS cores only. If you need to remove the turbulator that runs through the tubing, it will be necessary to first squeeze the flattened end of the protruding turbulator , so that on end will fit through the tube. From the opposite end pull the turbulator out. You may need to use pliers to grip and pull the turbulators out, especially if there is debris lodged inside. As the turbulators come out, most of the dirt will too, so be prepared. It is suggested that gloves be worn when handling the turbulators as they may be sharp.
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AOCHL Series Air Cooled Liquid Cooler for high capacity with multiple motors
See page 182
note: AIHTI reserves the right to make reasonable design changes without notice.
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355 American Industrial Drive LaCrosse, VA 23950
tel: 434-757-1800
fax: 434-757-1810
email: sales@aihti.com
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