Greenheck DG / DGX with Direct Spark (464043 IOM) (Pre-2008) - Manual (Page 20)

20
Start-Up - Blower
Start-Up
Step 4 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.
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 RPMs by changing the drive.
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). (see Reference section for adjusting
information)
• Solid Fuel Time Delay (typical setting varies per application)
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.
NOTE!
To ensure accuracy, the dampers are to be open when measuring the air volume.
IMPORTANT!
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.
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.
NOTE!
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.
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.