Greenheck DG / DGX Industrial Space Heating (464044 IOM) (Pre-2009) - Manual (Page 10)

Start-Up - Blower
S - 2
Step 4 Motor Check
Measure the motor voltage, amps and RPM, and compare to the specifications on the motor’s nameplate.
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 RPM 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.
• Building Freeze Protection (typical setting: 5 min at 45ºF)
• Dirty Filter Gauge (typical setting: settings vary greatly for each unit)
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!
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.
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.