Users Information Manual ENERGY RECOVERY UNITS 1
CONTENTS IMPORTANT SAFETY INFORMATION ……… 4 GENERAL INFORMATION …………………… Initial Mechanical Check & Setup Air Seal Adjustments Wheel-to-Air Seal Clearance 5 DESIGN CONDITIONS & CONTROL STRATEGIES …………………………………… Standard Temperature Control Fan Only Mode Economizer Mode Cooling Mode Heating Mode AIR FLOW BALANCING & CHECKING………… 6 Controls 11 VENTILATION OF OCCUPIED SPACES IN INDUSTRIAL APPLICATIONS ……………… 11 ROUTINE MAINTENANCE & HANDLING …… 7 Lifting Hole Locations Cleaning Wheel Drive Components …
IMPORTANT SAFETY INFORMATION ONLY QUALIFIED PERSONNEL SHOULD PERFORM INSTALLATION, OPERATION, AND MAINTENANCE OF EQUIPMENT DESCRIBED IN THIS MANUAL. WARNING RISK OF DAMAGE, INJURY, AND LOSS OF LIFE - Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury, or loss of life. A qualified installer or service agency must perform installation and service.
GENERAL INFORMATION The units are designed as self-contained heating, cooling or combination units using refrigerant, chilled water, natural or propane gas, electric resistance, steam or hot water as shown on the unit rating plate. INITIAL MECHANICAL CHECK & SETUP Outdoor units equipped with outside air intake will have an outside air hood. The outside air hood must be opened prior to unit operation. Remove shipping screws from each side of the hood in the “closed” position.
plates to the bearing support channels and slide the seal plates away from the wheel. Using the paper feeler gauge, readjust and retighten one seal plate at a time to provide slip fit clearance when the wheel is rotated by hand. Confirm that the wheel rotates freely. Apply power to the unit and confirm rotation. AIRFLOW BALANCING & CHECKING High performance systems commonly have complex air distribution and fan systems.
INSTALLATION CONSIDERATIONS AAONAIRE® Energy recovery cassettes are incorporated within the design of packaged units, packaged air handlers and energy recovery ventilators. In each case, it is recommended that the following considerations be addressed: recovery wheel will restore latent effectiveness to near original performance. To clean, gain access to the energy recovery wheel and remove segments. Brush foreign material from the face of the wheel.
5. Start and stop wheel several times to confirm seal adjustment and to confirm belt is tracking properly on wheel rim (approximately 1/4” from outer edge of rim). OPERATION CAUTION ! Keep hands away from rotating wheel!! Contact with rotating wheel can cause physical injury. Start Up Procedure 1. By hand, turn wheel clockwise (as viewed from the pulley side), to verify wheel turns freely through 360º rotation. 2.
SERVICE CAUTION ! Disconnect electrical power before servicing energy recovery cassette. Always keep hands away from bearing support beam when installing or removing segments. Failure to do so could result in severe injury to fingers or hand. Segment Installation & Replacement Wheel segments are secured to the wheel frame by a Segment Retainer which pivots on the wheel rim and is held in place by a Segment Retaining Catch. Segment Installation 3.
Belt Replacement 1. Obtain access to the pulley side bearing access plate if bearing access plates are provided. Remove two bearing access plate retaining screws and the access plate. 2. Using hexagonal wrench, loosen set screw in bearing locking collar. Using light hammer and drift (in drift pin hole) tap collar in the direction of wheel rotation to unlock collar. Remove collar. 3. Using socket wrench with extension, remove two nuts which secure bearing housing to the bearing support beam.
Ventilation of Occupied Spaces In Industrial Applications General ventilation of occupied spaces in Industrial facilities is an excellent application for energy recovery. It can have many significant benefits including: odor control, a better working environment for employees, higher productivity, reduced risk from exposure to volatile compounds and particulates in the indoor air, improved humidity control (for process and people) and reduced energy costs to condition the ventilation air.
By contrast, in space conditioning applications, where the ventilation system is operating to maintain acceptable indoor air quality, there should be no contaminants in concentrations of concern. Cross leakage in the energy recovery system results in a small amount of the exhaust air, typically less than 5% for wheels operating in balanced flow, returning to the space from which it came. This is not “contamination” as it is often labeled. It is air that effectively never left the space.
humidity. On the other hand, silica gel has superior characteristics for the recovery of space conditioning energy from exhaust air.) bulk liquid water present which could support fungal growth or dissolve other chemical species. The transfer of water onto and off of the wheel’s desiccant surfaces occurs in the vapor or gas phase. There are no “wet” surfaces and liquid water does not enter the air stream.
Also, self-certification does not include the necessary periodic verification tests and challenge procedures provided by the industry certification program. Specifications requiring ARI Certification in accordance with the latest revision of ARI Standard 1060 provide the best assurance that components and systems will perform as designed.
AAON, Inc. 2425 S. Yukon Tulsa, Oklahoma 74107 Tel 918-583-2266 Fax 918-583-6094 Download this manual, and others from: www.aaon.com It is the intent of AAON to provide accurate and current specification information. However, in the interest of product improvement, AAON, Inc. reserves the right to change pricing, specifications, and/or design of its products without notice, obligation, or liability. AAON is a registered trademark of AAON, Inc. Effective August 2006 Supercedes August 1998 R86610 (Rev.
