Greenheck DGX Installation, Operation And Maintenance Manual page 20

Step 3 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.
Step 4 Motor Check
Measure the motor's voltage, amps and RPM's and compare to the specifications on the motor's nameplate.
Check the overload setting and make sure it matches the motor's amperage rating. If the motor's actual amps
are greater than the nameplate amps, check and correct the supply voltage or air volume of the blower.
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 RPM's.
Step 5 Air Volume Measurement and
Check
Measure the unit's air volume (CFM) and compare it
with its rated air volume. If the air volume is off, adjust
the fan's RPM's by changing the drive.
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.
To insure accuracy, be sure the dampers are open when checking the air volume.
Step 6 Set-up Optional Components
Adjust the settings on the optional components. See the control center layout in the reference section for
location of optional components.
• Heating Inlet Air Sensor (typical setting: 60-70ºF)
• Cooling Inlet Air Sensor (typical setting: 75ºF)
• Building Freeze Protection (typical setting: 5 min at 45ºF)
• Dirty Filter Gauge (typical setting: settings vary greatly for each unit)
• Solid Fuel Time Delay (typical setting varies per application)
Start-Up - Blower
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.
NOTE!
The most accurate way to measure the air
volume is by using a pilot traverse method
downstream of the blower. Other methods can
be used but should be proven and accurate.
IMPORTANT!
NOTE!
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IMPORTANT!
NOTE!