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Utilizing different components than those supplied could result in unsafe operating conditions which may cause personal injury or failure of the following components: ...................... .................... ............S ...................... ..........U Tighten all fasteners and set screws securely and realign drive pulleys after adjustment. Check pulleys and belts for proper alignment to avoid unnecessary belt wear, noise, vibration and power loss. Motor and drive shafts must be parallel and pulleys in line (see diagrams in this section). Belt Drive Installation 1. Remove the protective coating from the end of the fan shaft and assure that it is free of nicks and burrs. 2. Check fan and motor shafts for parallel and angular alignment. 3. Slide sheaves on shafts. Do not drive sheaves on as this may result in bearing damage. 4. Align fan and motor sheaves with a straight-edge or string and tighten. 5. Place belts over sheaves. Do not pry or force belts, as this could result in damage to the cords in the belts. 6. With the fan off, adjust the belt tension by moving the motor base. (See belt tensioning procedures in the Routine Maintenance section of this manual). When in operation, the tight side of the belts should be in a straight line from sheave to sheave with a slight bow on the slack side. WRONG WRONG WRONG CORRECT Direction of Fan Wheel Rotation Blower access is labeled on unit. Check for proper wheel rotation by momentarily energizing the fan. Rotation is determined by viewing the wheel from the drive side and should match the rotation decal affixed to the fan housing (see Rotation Direction figures). If the wheel is rotating the wrong way, direction can be reversed by interchanging any two of the three electrical leads. Check for unusual noise, vibration, or overheating of bearings. Refer to the Troubleshooting section of this manual if a problem develops. Rotation Airflow Rotation Forward Curved Fan RPM Supply fan and exhaust fan will have an adjustable motor pulley (on 15 HP and below) preset at the factory to the customer specified RPM. Fan speed can be increased or decreased by adjusting the pitch diameter of the motor pulley. Multi-groove variable pitch pulleys must be adjusted an equal number of turns open or closed. Any increase in fan speed represents a substantial increase in load on the motor. Always check the motor amperage reading and compare it to the amperage rating shown on the motor nameplate when changing fan RPM. All access doors must be installed except the control center door. Do not operate units with access doors open or without proper ductwork in place as the fan motors will overload. 24 Energy Recovery Ventilator Vibration Excessive vibration may be 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. Many of these conditions can be discovered by careful observation. Wheel Unbalance Refer to the Drive Pulley Misalignment Troubleshooting Incorrect Belt Tension section of this manual Bearing Misalignment for corrective actions. Mechanical Looseness If observation cannot Faulty Belts locate the source of Drive Component Unbalance vibration, a qualified Poor Inlet/Outlet Conditions Foundation Stiffness technician using vibration analysis equipment should be consulted. If the problem is wheel unbalance, in-place balancing can be done. Generally, fan vibration and noise is transmitted to other parts of the building by the ductwork. To eliminate this undesirable effect, the use of heavy canvas connectors is recommended. Energy Recovery Wheel The ERV models contain a total energy recovery wheel. The wheels are inspected for proper mechanical operation at the factory. However, during shipping and handling, shifting can occur that may affect wheel operation. The wheel is accessible through the access door marked “Energy Wheel Cassette Access”. For the ERV251, 361, 521, and 522, the wheel cassette(s) slide out. Due to the size and weight of the ERV581 and 582 wheels, they remain stationary and all maintenance is performed in place. There is room inside the unit to perform energy recovery wheel servicing. Turn the energy Bearing recovery Supportwheels by hand to verify free operation. The wheel should rotate Label showing smoothly and cassette should not serial # and date wobble. code Inside layout of ERV-361 Inside layout of ERV-522 Drive Belt Adjustable Air Seals Drive Pulley Drive Belt Inspect the drive belt. Make sure the belt rides smoothly through the pulley and over the wheel rim. Air Seals Check that the air seals located around the outside of the wheel and across the center (both sides of wheel) are secure and in good condition. Air seal clearance is determined by placing a sheet of paper, to act as a feeler gauge, against the wheel face. To access seals, enter the unit for the ERV-581 and 582, or pull out the cassette for th...

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