valutazioni - 3, GPA: 4.3 ( )

Produttore : Greenheck Fan File Size : 358.34 kb File Nome : Lingua di insegnamento:

When this occurs the wheel and housing should be cleaned to assure smooth and safe operation. Inspect fan impeller and housing for fatigue, corrosion or wear. Routinely check all fasteners, set screws and locking collars on the fan, bearings, drive, motor base and accessories for tightness. A proper maintenance program will help preserve the performance and reliability designed into the fan. Deflection = Belt Span Belt Span 64 FIGURE 18 VIBRATION Excessive vibration maybe experienced during initial start-up. Left unchecked, excessive vibration can cause a multitude of problems, including structural and/or component failure. The most common sources of vibration are listed below. Many of these conditions can be discovered by careful observation. Refer to the troubleshooting section of this manual for corrective actions. If observation cannot locate the source of vibration, a qualified technician using vibration analysis equipment should be consulted. If the problem is wheel unbalance, in-place balancing can be done providing there is access to the fan wheel. Generally, fan vibration and noise are transmitted to other parts of the building by the ductwork. To eliminate this undesirable effect, the use of heavy canvas connectors is recommended. 1. Wheel Unbalance 2. Drive Pulley Misalignment 3. Incorrect Belt Tension 4. Bearing Misalignment 5. Mechanical Looseness 6. Faulty Belts 7. Drive Component Unbalance 8. Poor Inlet/Outlet Conditions 9. Foundation Stiffness EXTERNAL FILTER MAINTENANCE Aluminum mesh 2 in. filters are located in the supply weatherhood (if the weatherhood option was purchased). Filters should be checked and cleaned on a regular basis for best efficiency. The frequency of cleaning depends upon the cleanliness of the incoming air. To remove these filters, remove bottom bolt in the access door on the side of the weatherhood. Slide the access door up and then pull out. Then, slide the filters out (see FIGURE 19). Clean filters by rinsing with a mild detergent in warm water. After the filters are dry, an adhesive spray available at most filter distributors may be applied to increase filter efficiency. INTERNAL FILTER MAINTENANCE Opening the access doors labeled as “Filter Access” provides access to the pleated 30% filters (if the filter option was purchased). These filters should be checked regularly, cleaned or replaced as needed. See TABLE 2 for pleated filter size and quantity for each unit. FIGURE 19 Internal Model Filter Size Quantity HRE-20 20 x 20 2 HRE-45 20 x 25 3 HRE-55 16 x 25 6 HRE-90 20 x 20 8 TABLE 2 WATER COIL MAINTENANCE CAUTION: See **WARNING** on Page 1 and 15 FILTERS Filters upstream of the coil should be checked regularly. If the filters are dirty, they should be cleaned or replaced. It is important that the coils stay clean to maintain desired airflow. See page 18 for more information on filter maintenance. COIL MAINTENANCE 1. Coils must be clean to obtain maximum performance. Check once a year under normal operating conditions and, if dirty, brush or vacuum clean. Soiled fins reduce the capacity of the coil, demand more energy from the fan, and create an environment for odor and bacteria to grow and spread through the conditioned zone. High pressure water (700 Psi or less) may be used to clean coils with fin thickness over 0.0095 inches thick. TEST THE SPRAY PRESSURE over a small corner of the coil to determine if the fins will withstand the spray pressure. For coils with fragile fins or high fin density, foaming chemical sprays and washes are available. Many coil cleaners contain harsh chemicals, so they must be used with caution by qualified personnel only. Care must be taken not to damage the coils, including fins, while cleaning. CAUTION: Fin edges are sharp. **WARNING** BIOLOGICAL HAZARD. MAY CAUSE DISEASE. CLEANING SHOULD BE PERFORMED BY QUALIFIED PERSONNEL. ROUTINE ENERGY RECOVERY WHEEL MAINTENANCE CAUTION: See **WARNING** on Page 1 and 15 MAINTENANCE OF THE ENERGY RECOVERY WHEEL Annual inspection of the energy recovery wheel is recommended. Units ventilating smoking lounges and other non-clean air spaces should have energy recovery wheel inspections more often based upon need. Inspections for smoke ventilation applications are recommended bimonthly to quarterly until a regular schedule can be established. ACCESSING ENERGY RECOVERY WHEEL For the HRE-20 and HRE-45, open the access door marked "Energy Wheel Cassette Access" (FIGURE 20). UNPLUG the wheel drive motor and remove the metal spacer. Then pull the cassette out halfway (FIGURE 21). The energy recovery wheel cassettes for model HRE-55 and HRE-90 do not slide out due to their size and weight. Service to these energy wheel cassettes can be done through the Filter and Electrical Control Box access doors, or by entering the unit through the Exhaust Blower access door. **WARNING: Disconnect power to the unit before performing any type of service.** FIGURE 20 FIGURE 21 REMOVING THE ENERGY RECOVERY WHEEL SEGMENTS Model...

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