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AOCS Series installation and maintenance Grease ports located on the adapter should be greased regularly with a high quality bearing grease.

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. 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 tap- ping 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. 1

e) Initial inspection, check the fan blade bolts for loosen- ing after the first 100 hours of operation. Re-tighten the fan blade bolts to the proper torque if required. Note: Failure to check and maintain the fan blade could result in damage or failure of the equipment. Fan blades should be cleaned and inspected for tightness during the regular maintenance schedule when handling a fan blade care must be given to avoid bending or striking any of the blades. Fan blades are factory balanced and will not operate properly if damaged or unbalanced. Damaged fan blades can cause excessive vibration and severe damage to the heat exchanger or drive motor. Replace any damaged fan with an American industrial suggested replacement. f) Air cooled exchanger cabinets are constructed using 7ga. through 18ga. steel that may be bent back into po- sition if damaged. Parts that are not repairable can be purchased through American Industrial. g) Coil fins that become flattened can be combed back into position. This process may require removal of the coil from the cabinet. i) Solely at the request of customers, American Industrial provides direct acting internal inlet port to outlet port bypass relief valves as an additional safe guard against surge flow and over pressurization of the heat exchanger. However, American Industrial does not specify, recom- mend, suggest, guarantee, or warrantee the internal relief valve or its performance to safe guard the heat exchanger from damage or prevent failure due to excessive flow or over pressurization. It is the ultimately the sole responsi- bility of the customer/user to verify with the original equip- ment manufacture all conditions associated with applying an additional system relief valve prior to application. Serviceable Core ® Maintenance Units containing a Serviceable Core ® have bolted manifold covers that can be removed for cleaning or repair pur- poses. Most AOCH or AOCS cores manufactured after January 1, 1998 are Serviceable Cores ® . 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.

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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