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Model MSX Make-Up Air
Start-Up - Blower
1. Check the Voltage
Before starting the unit, compare the supplied voltage,
hertz, and phase with the unit and motor’s nameplate
information.
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 or reference
the example shown to the right.
Refer to the Start-Up Checklist in the Reference
section before proceeding further!
Pre Start-Up Check
Rotate the fan wheel by hand and make sure no parts
are rubbing. Check the V-belt drive for proper alignment
and tension (a guide for proper belt tension and
alignment is provided in the Belt Maintenance section).
Check fasteners, set screws and locking collars on the
fan, bearings, drive, motor base, and accessories for
tightness.
SPECIAL EQUIPMENT REQUIRED
Required and recommended tools. Equivalent
products may be used.
Voltage &
Amperage
Meter
Manufacturer: Fluke
Model: 177
Phone: 1-800-44-FLUKE
www.fluke.com
Thermometer
Manufacturer: Fluke
Model: 50
Phone: 1-800-44-FLUKE
www.fluke.com
Micro Amp
Meter
Manufacturer: Fluke
Model: 116
Phone: 1-800-44-FLUKE
www.fluke.com
U-Tube
Manometer
Manufacturer: Dwyer
Model: Slack Tube
Phone: 1-219-897-8000
www.dwyer-inst.com
Tachometer
Manufacturer: Monarch
Model: Pocket Tach 100
Phone: 1-800-999-3390
www.monarchinstrument.com
WARNING
Check the housing, blower, and ductwork for any
foreign objects before running the blower.
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.
WARNING
Disconnect and lock-out all power and gas before
performing any maintenance or service to the unit.
Failure to due so could result in serious injury or
death and damage to equipment.
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.
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.
Electrical Nameplate
SUP HP
MCA
EXH HP
MOP
VOLTS HZ PH
Unit’s Total MCA
Voltage, Hertz, Phase
SUP HP
MCA
EXH HP
MOP
VOLTS HZ PH
Voltage, Hertz, Phase
Blower Rotation
Blower
Housing
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