11
GENERAL
Check all fasteners and set screws for tightness. This is especially important
for bearings and fan wheels. Also, if dampers are not motorized, check that
they open and close without binding.
FAN WHEEL ROTATION
Hand rotate the blower to ensure that the wheel is not rubbing against the
scroll. If the blower is rotating in the wrong direction, the unit will move some
air but not perform properly.
To check the rotation, open the blower access panels, which are labeled either
supply or exhaust, and run the blower momentarily to determine the rotation.
Rotation should be in the same direction as airflow at the outlet (See FIGURES
14 & 15). Check for unusual noise, vibration or overheating of bearings. Refer to
the “Trouble Shooting” section of this manual if a problem develops.
To r everse the rotation, turn the power off and use the following procedure:
•For single phase units, rewire the motor per the instructions on the
motor.
•For three phase units, interchange any two power leads. (this can be
done at the motor starter).
START UP CHECKS**WARNING**
DO NOT OPERATE ENERGY RECOVERY VENTILATOR WITHOUT THE FILTERS ANDBIRDSCREENS INSTALLED.
THEY PREVENT THE ENTRY OF FOREIGN OBJECTS SUCH AS LEAVES, BIRDS, ETC.
DO NOT REMOVE ACCESS PANELS OR OTHER UNITCOMPONENTS WHILE STANDING ON A LADDER OR OTHER
UNSTEADY BASE. ACCESS PANELS ANDUNIT COMPONENTS ARE HEAVY AND SERIOUS INJURY MAY OCCUR.
CAUTION: See **WARNING** on page 1 and above
For proper unit function and safety, follow everything in this start-up procedure in the order presented. This to
be done after the electrical and gas connections are complete.
Pre-Start Check List
1. Disconnect and lock-out all power switches to fan.
2. Check all fasteners, set screws and locking collars on the fan, bearings, drive, motor base and
accessories for tightness.
3. Rotate the fan wheel by hand and assure no parts are rubbing.
4. Check the V-belt drive for proper alignment and tension.
Special Tools Required • Voltage meter
• Incline manometer or equivalent
• Tachometer
• Thermometer
• Amperage meter
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Airflow
FIGURE 14
FIGURE 15
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