Verifying Proper Fan Rotation; System Airflow Measurements - Trane IntelliPak WEHE Series Installation, Operation And Maintenance Manual

System Start-up

Verifying Proper Fan Rotation

1. Ensure that the "System" selection switch at the
remote panel is in the "Off" position and the "Fan"
selection switch for constant volume units is in the
"Auto" position. (VAV units do not utilize a "Fan"
selection input.)
2. Close the disconnect switch or circuit protector switch
that provides the supply power to the unit's terminal
block 1TB1 or the unit mounted disconnect switch
1S14.
3. Turn the 115 volt control circuit switch 1S1 and the 24
volt control circuit switch 1S70 to the "On" position.
4. 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 RT-SVP04*-EN (VAV), RT-SVP05*-EN (CV) for
the SERVICE TEST screens and programming
instructions.
5. Use Table 20, p. 75 to program the unit Fans for
operation by scrolling through the displays. All of the
Fans (Supply & Exhaust fans) can be programed to be
"On", if desired. Verify proper fan rotation for VFDs
with bypass.
6. Once the configuration for the Fans 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. This service test will begin
after the TEST START key is pressed and the delay
designated in this step has elapsed. Press the ENTER
key to confirm this choice.
WARNING
Rotating Components!
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. Failure to follow all
safety precautions could result in rotating components
cutting and slashing technician which could result in
death or serious injury.
7. Press the TEST START key to start the test. Remember
that the delay designated in the previous step must
elapse before the fans will begin to operate.
8. Check the supply fan and the exhaust fans (if equipped)
for proper rotation. The direction of rotation is
indicated by an arrow on the fan housings. Check the
condenser fans for clockwise rotation when viewed
from the top.
If all of the fans are rotating backwards;
a. Press the STOP key at the Human Interface Module
in the unit control panel to stop the fan operation.
76
WARNING
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.
b. Open the field supplied disconnect switch upstream
of the rooftop unit. Lock the disconnect switch in the
open position while working at the unit.
c. Interchange any two of the field connected main
power wires at the unit terminal block 1TB1 or the
factory mounted disconnect switch 1S14.
Note: Interchanging "Load" side power wires at the fan
contactors will only affect the fan rotation. Ensure
that the voltage phase sequence at the main
terminal block 1TB1 or the factory mounted
disconnect switch 1S14 is ABC as outlined in the
"Electrical Phasing" section.
If some of the fans are rotating backwards;
a. Press the STOP key at the Human Interface Module
in the unit control panel to stop the fan operation.
WARNING
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.
b. Open the field supplied disconnect switch upstream
of the rooftop unit. Lock the disconnect switch in the
open position while working at the unit.
c. Interchange any two of the fan motor leads at the
contactor for each fan that is rotating backwards.

System Airflow Measurements

Constant Volume Systems
1. Ensure that the "System" selection switch at the
remote panel is in the "Off" position and the "Fan"
selection switch for constant volume units is in the
"Auto" position. (VAV units do not utilize a "Fan"
selection input.)
RT-SVX35H-EN