RT-SVX073A-EN
93
WARNING
Live Electrical Components!
Failure to follow all electrical safety precautions when
exposed to live electrical components could result in
death or serious injury.
When it is 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.
Voltage Imbalance
Excessive three phase voltage imbalance between phases
will cause motors to overheat and eventually fail. The
maximum allowable voltage imbalance is 2 percent.
Measure and record the voltage between phases 1, 2, and
3 and calculate the amount of imbalance as follows:
percent Voltage Imbalance =
where;
AV (Average Voltage) =
V1, V2, V3 = Line Voltage Readings
VD = Line Voltage reading that deviates the farthest from
the average voltage.
Example: If the voltage readings of the supply power
measured 221, 230, and 227, the average volts would be:
VD (reading farthest from average) = 221
The percentage of Imbalance equals:
The 2.2% imbalance in this example exceeds the
maximum allowable imbalance of 2.0%. This much
imbalance between phases can equal as much as a 20%
current imbalance with a resulting increase in motor
winding temperatures that will decrease motor life. If the
voltage imbalance is over 2%, notify the proper agencies to
correct the voltage problem before operating this
equipment.
Verifying Proper Fan Operation
WARNING
Hazardous Service Procedures!
Failure to follow all precautions in this manual and on
the tags, stickers, and labels could result in death or
serious injury.
Technicians, in order to protect themselves from
potential electrical, mechanical, and chemical
hazards, MUST follow precautions in this manual and
on the tags, stickers, and labels, as well as the
following instructions: Unless specified otherwise,
disconnect all electrical power including remote
disconnect and discharge all energy storing devices
such as capacitors before servicing. Follow proper
lockout/tagout procedures to ensure the power can
not be inadvertently energized. When necessary to
work with live electrical components, have a qualified
licensed electrician or other individual who has been
trained in handling live electrical components perform
these tasks.
1. Close the disconnect switch or circuit protector switch
that provides the supply power to the unit terminal block
2XD1 or the unit mounted disconnect switch 2QB1.
2. Turn the 115 volt control fused disconnect circuit switch
to the On position.
WARNING
Rotating Components!
Failure to disconnect power before servicing could
result in rotating components cutting and slashing
technician which could result in death or serious
injury.
During installation, testing, servicing and
troubleshooting of this product it may be necessary
to work with live and exposed rotating components.
Have a qualified or licensed service individual who
has been properly trained in handling exposed
rotating components, perform these tasks.
3. Press the Stop button on the user interface. To setup
and troubleshoot supply fan operation, navigate to
Supply Fan Manual Override by following the steps
provided below.
Note: The unit’s design supply airflow is established
when the supply fan is operating at 100% speed
command. If the design supply airflow rating of
the unit needs to be modified, the new maximum
design speed must be set at the supply fan’s
variable frequency drive (VFD) key pad. The
user should identify the maximum speed for the
supply fan wheels and ensure those speeds are
not exceeded when making entries at the VFD
key pads.
a. Press Stop and then touch Settings.
Unit Startup
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