Greenheck DGK (468695) - Manual (Page 8)

8
3. Check for Vibration: Check for unusual noise,
vibration or overheating of the bearings. Reference
the Troubleshooting section for corrective actions.
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.
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.
WARNING
Changing the air volume can significantly increase
the amp draw of the motor. If the air volume is
changed, the motor’s amps must be checked to
prevent overloading the motor.
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.
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/adjusting the drive.
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.
To ensure accuracy, be sure the dampers are open
when checking the air volume.
6. Set-Up Heating Inlet Air Sensor: The heating inlet
air sensor will automatically turn the heat on if the
outdoor air temperature is below the set point while
the fan is operating.
• Typical setting: 55º-65ºF
WARNING
Disconnect and lock-out all power before
performing any maintenance or service to the unit.
Failure to do so could result in property damage and
serious injury or death.
WARNING
Check the housing, blower, weatherhood and
ductwork for foreign objects and debris before the
blower is energized.
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.
TO REVERSE ROTATION
To reverse the rotation, disconnect and lock-out the
power.
Single Phase:
Rewire the motor per the
manufacturer’s instructions.
Three Phase: Interchange any two power leads.
SPECIAL TOOLS REQUIRED
• Voltage meter (with wire probes)
• Amperage meter
• Micro amp meter
• Tachometer
• Thermometer
• Incline manometer or equivalent
2. 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.
Blower
Rotation
Housing
1. Check the Voltage: Before starting the unit,
compare the supplied voltage, hertz, and phase
with the unit and motor nameplate information. The
nameplate is located on the outside of the unit on
the control panel side.
SUP HP
MCA MOP
VOLTS HZ PH
SUP HP
MCA MOP
VOLTS HZ PH
Unit’s Total MCA
Voltage, Hertz, Phase
SUP HP
MCA MOP
VOLTS HZ PH
Voltage, Hertz, Phase
KSFB/KSFD
DGK
DGK
Electrical Nameplate
Blower Rotation
Start-Up — Blower
Model DGK Make-Up Air
®