Greenheck Fan Outdoor Air Ventilator - Manual (Page 13)

SYSTEM STARTUP
For proper unit function and safety, follow everything in this startup procedure in the order presented. This is to
be done after the electrical connections are complete.
• Voltage meter
• Incline manometer or equivalent
Special Tools Required • Tachometer
• Thermometer
• Amperage meter
1. Check Voltage
Before starting the unit compare the supplied voltage with the unit’s nameplate voltage and the motor
voltage.
2. Check Blower Rotation
First 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 door and run the blower momentarily to determine the rotation. To
reverse 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.
3. Air Volume Check and Measurement
Along with the building balance, the units air volume (cfm) should be measured and compared with its rated air
volume. This unit is flexible for varying air volume (units above 15 Hp may have fixed drives), but the actual air
volume should be known for making final adjustments.
The most accurate way to measure the air volume is by using the pitot traverse method in the ductwork away
from the blower. Other methods can be used but should be proven and accurate.
To adjust the air volume, change the fan RPM or the system losses. See Trouble Shooting Section in this
guide.
4. Measure Motor Voltage, Amperage and Fan RPM
All access doors must be installed except the control center door. Measure and record the input voltage and
motor amperage(s).
To measure the fan RPM, the blower door will need to be removed. Minimize measurement time because the
motor may over amp with the door removed.
With blower door in place compare measured amps to the motor nameplate full load amps and correct if
overamping. See the trouble shooting section in this guide.
5. Settings for Optional Components
Freeze Protection:
This de-energizes the blower if the output temperature is below the set point. A timer allows the blower to
operate during startup. This will reset when turned off.
Typical settings are:
Discharge temperature = 35°F Timer = 5 minutes
Blower
Housing
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