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RT-SVX24Q-EN
elapse before the fans will begin to operate.
7. 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 aaccttuuaall CCFFMM (± 5%):
a. Measure the actual fan RPM
b. Calculate the Theoretical BHP:
c. Use “Exhaust Fan (with or without Energy
Recovery Wheel),” p. 119 to calculate a new fan
drive if the CFM is not at design specifications.
8. Press the STOP key at the Human Interface Module
in the unit control panel to stop the fan operation.
Traq™ Sensor Airflow Measurement
((OOppttiioonnaall wwiitthh aallll uunniittss eeqquuiippppeedd wwiitthh aann
eeccoonnoommiizzeerr))
1. Open the Human Interface access door, located in
the unit control panel, and press the SERVICE
MODE key to display the first service screen. Refer
to the latest edition of the appropriate
programming manual for applications for the
SERVICE TEST screens and programming
instructions.
2. Use the tables in “Voltage Imbalance,” p. 105 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)
• RTM Occ/Unocc Output (Unoccupied)
• Outside Air CFM Setpoint
• Outside Air Pre-Heater Operation (if applicable)
3. Once the configuration for the components is
complete, press the NEXT key until the LCD
displays the “Start test in __Sec.” screen. Press the
+ key to designate the delay before the test is to
start. TThhiiss sseerrvviiccee tteesstt wwiillll bbeeggiinn aafftteerr tthhee TTEESSTT
SSTTAARRTT kkeeyy iiss pprreesssseedd and the delay designated in
this step has elapsed. Press the ENTER key to
confirm this choice.
4. Press the TEST START key to start the test.
Remember that the delay designated in step 3 must
elapse before the fans will begin to operate.
5. With the unit operating in the “TEST MODE”, the
amount of outside air flowing through the Traq™
sensor can be viewed by switching to the “STATUS
MENU” screen “OA CFM.
6. Scroll to the “ECONOMIZER ENABLE/ECONOMIZER
POSITION” screen by pressing the NEXT key and
read the corresponding damper opening
percentage (%).
7. Press the STOP key at the Human Interface Module
in the unit control panel to stop the unit operation.
UUnniitt SSttaarrttuupp
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