Greenheck DG/DGX Pilot Ignition (470651_IOM) - Manual (Page 15)

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.
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 minutes; 45ºF
• Dirty Filter Gauge
Typical setting: Settings vary greatly for each
unit. See Reference section for adjusting
information.
3. Check for Vibration
Check for unusual noise, vibration or overheating of
the bearings. Reference the Troubleshooting section
for corrective actions.
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.
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.
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
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.
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.
5. Air Volume Measurement and Check
Measure the unit’s air volume (cfm) and compare it
with it’s rated air volume. If the measured air volume
is off, adjust the fan’s RPM by changing/adjusting the
drive.
Model DG / DGX Pilot Ignition Make-Up Air 15
®