Greenheck Fan 470654 manual Start-Up Blower

Start-Up - Blower

Warning

Check the housing, blower, and ductwork for any foreign objects before running the blower.

warning

Disconnect and lock-out all power and gas before performing any maintenance or service to the unit. Failure to do so could result in serious injury or death and damage to equipment.

SPECIAL TOOLS REQUIRED

•Voltage Meter (with wire probes)

•Amperage Meter

•Pressure Gauges – (refrigerant)

•Tachometer

•Thermometer

•Incline manometer or equivalent

Check the Voltage

Before starting the unit, compare the supplied voltage, hertz, and phase with the unit and motor’s nameplate information.

Voltage, Hertz, Phase

VOLTS	HZ		PH
SUP HP	EXH HP
MCA		MOP

Electrical Nameplate

Check for Vibration

Check for unusual noise, vibration or overheating of the bearings. Reference the Troubleshooting section for corrective actions.

Important

Excessive vibration may be experienced during the initial start-up. Left unchecked, it can cause a multitude of problems including structural and/or component failure.

Important

Generally, fan vibration and noise is transmitted to other parts of the building by the ductwork. To minimize this undesirable effect, the use of heavy canvas duct connectors is recommended.

Motor Check

Measure the motor’s voltage, amps and RPM. Compare to the specifications. Motor amps can be reduced by lowering the motor RPM or increasing system static pressure.

Important

Additional starters and overloads may be provided in the make-up air control center for optional exhaust blowers. Any additional overloads must be checked for proper voltage, amps and RPMs.

Air Volume Measurement and Check

Measure the unit’s air volume (cfm) and compare it with the rated air volume. If the measured air volume is off,

Check the Blower Rotation

Open the blower access door and run the blower momentarily to determine the rotation. Arrows are placed on the blower scroll to indicate the proper direction or reference the example shown to the right.

			n
			io
			t
		a
R	o	t

Blower

Housing

Blower Rotation

adjust the fan’s RPM by changing/adjusting the drive.

Note

The most accurate way to measure the air volume is by using a pitot traverse method downstream of the blower. Other methods can be used, but should be proven and accurate.

Important

Note

To reverse the rotation on three phase units, disconnect and lock-out the power, then interchange any two power leads.

Note

To reverse the rotation on single phase units, disconnect and lock-out the power, then rewire the motor per the manufacturer’s instructions.

Important

If the blower is rotating in the wrong direction, the unit will move some air, but will not perform as designed. Be sure to perform a visual inspection to guarantee the correct blower rotation.

14Model VSU Make-Up Air

Changing the air volume can significantly increase the motor’s amps. If the air volume is changed, the motor’s amps must be checked to prevent overloading the motor.

Note

To ensure accuracy, the dampers are to be open when measuring the air volume.

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