Unit Start-Up
Refer to Parts List section for component locations.
Fans
The PVe models contain two |
forward curved (supply & |
exhaust) fans. These forward |
curved fans should be checked |
for free rotation. If any binding |
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.
occurs, check for concealed |
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damage and foreign objects |
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in the fan housing. Be sure to | Forward Curved | |
check the belt drives per the | ||
Exhaust Fan | ||
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the following section. |
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CAUTION
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WRONGCORRECT
When operating conditions of the fan are to be changed (speed, pressure, temperature, etc.), consult Greenheck to determine if the unit can operate safely at the new conditions.
Fan Performance Modifications
Due to job specification revisions, it may be necessary to adjust or change the sheave or pulley to obtain the desired airflow at the time of installation.
to ensure that the amperage listed on the motor nameplate is not exceeded. Amperage to be tested with access doors closed and ductwork installed.
Fan Belt Drives
The fan belt drive components, when supplied by Greenheck, have been carefully selected for the unit’s specific operating condition. Utilizing different components than those supplied could result in unsafe operating conditions which may cause personal injury or failure of the following components:
• Fan Shaft | • Bearings | • Motor |
• Fan Wheel | • Belt |
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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
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.
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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. Multigroove 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.
20Model PVe Heat Recovery Unit
