96
RT-SVX073A-EN
Exhaust Airflow Measurement (Optional)
WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could
result in death or serious injury.
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Verify that no power is
present with a voltmeter.
Important: HIGH VOLTAGE IS PRESENT AT TERMINAL
BLOCK OR UNIT DISCONNECT SWITCH.
1. Close the disconnect switch or circuit protector switch
that provides the supply power to the unit's terminal
block or the unit mounted disconnect switch.
2. Turn the 115 volt control circuit switch and the 24 volt
control circuit switch to the “On” position.
3. Navigate to Relief Fan Manual Overrides. The Relief
fan speed will be adjusted through the user interface.
With the unit in Stop, tap Manual Override for the Relief
Fan. Set the Fan Speed to 100%..
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.
4. With the exhaust dampers open and the exhaust fan
operating at full airflow capability, measure the
amperage at the exhaust fan contactor. If the amperage
exceeds the motor nameplate value, the static pressure
is less than design and airflow is too high. If the
amperage is below the motor nameplate value, static
pressure may be too high and CFM may be too low.
To determine the actual CFM (± 5%):
a. Measure the actual fan RPM
b. Calculate the Theoretical BHP:
c. Use “Relief Fan,” p. 101 to calculate a new fan
drive if the CFM is not at design specifications.
5. Press the STOP key on the user interface in the unit
control panel to stop the fan operation.
Traq™ Sensor Airflow Measurement
(Optional with all units equipped with an economizer)
1. Use to program the following system components for
Economizer operation by scrolling through the displays;
• Supply Fan (On)
• Outside air dampers (Selected % Open)
• Variable Frequency Drive (100% Output, if
applicable)
• Outside Air CFM Setpoint
• Outside Air Pre-Heater Operation (if applicable)
2. Navigate to Supply Fan Manual Overrides. The supply
fan speed will be adjusted through the user interface.
With the unit in Stop, touch the Manual Override button
for the Supply Fan. Set the Fan Speed to 100%.
3. With the unit operating in the “Manual Override”, the
amount of outside air flowing through the Traq™ sensor
can be viewed.
4. Navigate to the “ECONOMIZER POSITION” and read
the corresponding damper opening percentage (%).
Unit Startup
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