Verifying Proper Fan Rotation; Verifying Proper Air Flow (Cfm) - Trane Voyager Commercial Installation & Operation Manual

Verifying Proper Fan Rotation

Using the Service Test guide in
constant volume applications, or three consecutive times for a variable air volume application, to
start the Minimum Ventilation Test.
Rotating Components!
Disconnect all electric power, including remote disconnects before servicing. Follow proper
lockout/tagout procedures to ensure the power can not be inadvertently energized. Failure to
disconnect power before servicing could result in death or serious injury.
The Exhaust Fan will start anytime the economizer damper position is equal to or greater than the
exhaust fan setpoint.
The economizer will drive to the minimum position setpoint, exhaust fans may start at random,
IGV's will be controlled by discharge pressure (if applicable), and the supply fan will start.
Once the supply fan has started, check for proper rotation. The direction of rotation is indicated by
an arrow on the fan housing.
If the fan is rotating backwards, open the main power disconnect switch upstream of the unit
terminal block or the unit factory mounted disconnect switch.
Hazardous Voltage!
Disconnect all electric power, including remote disconnects before servicing. Follow proper
lockout/tagout procedures to ensure the power can not be inadvertently energized. Failure to
disconnect power before servicing could result in death or serious injury.
Interchange any two of the field connected power wires at the unit terminal block or factory
mounted disconnect switch.
Note: Interchanging "Load" side power wires at the supply fan contactor will only affect the Fan

Verifying Proper Air Flow (CFM)

(CV, IGV's or VFD's)
1. All systems - Set the minimum position setting for the economizer to 0o degrees using the
Note: On VAV applications, IGV's will be under control of the Discharge Static Pressure setpoint
RT-SVX34C-EN
WARNING
WARNING
Rotation. Ensure that the voltage phase sequence at the main unit terminal block or the unit
mounted disconnect switch is ABC as outlined in the "Electrical Phasing" section.
setpoint potentiometer located on the Economizer Actuator in the return section with the
supply fan "On" and rotating in the proper direction:
CV applications - Measure the amperage at the supply fan contactor and compare it with the
full load amp (FLA) rating stamped on the motor nameplate.
IGV's - With the O/A dampers fully closed, measure the amperage at the supply fan contactor
and compare it with the full load amp (FLA) rating stamped on the motor nameplate.
VFD's - With the O/A dampers fully closed, read the amperage displayed on the VFD screen and
compare it to the motor nameplate.
for the first six minutes of this test mode. Verify that the IGV's have been driven to the full
open position or the VFD output is at 60 Hz before measuring the fan motor amps.
If the actual amperage exceeds the nameplate value, static pressure is less than design and air
flow is too high. If the actual amperage is below the nameplate value, static pressure is greater
than design and air flow is too low.
Table 28, momentarily jump across the test terminals one time for
Startup
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