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Startup
44 CAH-SVX01A-EN
General Checks
• Ensure the unit has been
installed level.
• Ensure supply-air and return-air
ducts have been connected.
• Ensure damper operator motors
and connecting linkage have
been installed.
• Verify damper operation and
linkage alignment.
• Check that air filters are in place
and positioned properly.
• Remove any debris from the unit
interior.
• Close and secure all unit access
doors.
Note: UL-listed units require a
removable latch on access doors.
The door clip shipped with the unit
meets this requirement.
• Inspect electrical connections to
the unit and unit controllers.
– Connections should be clean
and secure.
– Compare the actual wiring
with the unit diagrams.
– Reference the appropriate
controller manual for more
details about starting units
with factory-mounted
controls.
• Leave this manual with the unit.
Unit Operation
Before complete startup, bump-start
the unit and confirm the fan wheel
rotates properly, as indicated by the
rotation arrow located on the fan
housing.
After initial startup:
• Calculate the motor voltage
imbalance, notifying the power
company to correct unacceptable
imbalances.
• Periodically check the fan belt
tension.
Calculate Motor
Voltage Imbalance
After startup, measure the motor
voltage and amperage on all phases
to ensure proper operation. The
readings should fall within the range
given on the motor nameplate. The
maximum allowable voltage
imbalance is 2 percent.
Voltage imbalance is defined as 100
times the sum of the deviation of the
three voltages from the average,
divided by twice the average
voltage. For example, if the three
measured voltages are 221, 230 and
227, the average voltage would be
226 volts. The percent of voltage
imbalance is then calculated:
Voltage imbalance =
where:
A = (226-221) + (230-226) + (227-226)
Voltage imbalance = 2.2% (not acceptable)
In the example, 2.2 percent
imbalance is not acceptable and the
power company should be notified
to correct it.
100A
2
AvgVoltage×
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ƽ WARNING
Live Electrical
Components!
During installation, testing,
servicing and troubleshooting of
this product, it may be necessary to
work with live electrical
components. Have a qualified
licensed electrician or other
individual who has been properly
trained in handling live electrical
components perform these tasks.
Failure to follow all electrical safety
precautions when exposed to live
electrical components could result
in death or serious injury.