Check Blower Rotation | Greenheck Fan Outdoor Air Ventilator

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.

Special Tools Required

1. Check Voltage

•Voltage meter

•Incline manometer or equivalent

•Tachometer

•Thermometer

•Amperage meter

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.

Blower

Housing

o t a t i

o n

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