Unit Start Up
RT-SVX36K-EN 101
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 the appropriate programming manual for CV
or VAV applications for the SERVICETEST screens and
programming instructions.
5. Use Table 42, p. 96 to program the unit Fans for
operation by scrolling through the displays. All of the
Fans (Supply, Exhaust, and Condenser fans) can be
programed to be “On”, if desired. Verify proper fan
rotation for VFDs with bypass.
Refer to Figure 59, p. 103 for the condenser fan locations
and the Human Interface designator.
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 theTEST START key is pressed and the delay
designated in this step has elapsed. Press the ENTER
key to confirm this choice.
7. Press theTEST START key to start the test. Remember
that the delay designated in step 6 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 on FC fans by an arrow on the fan housings
and for DDP fans by an arrow above the inlet cone.
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.
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 individual 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;
• Press the STOP key at the Human Interface Module in
the unit control panel to stop the fan operation.
• Open the field supplied disconnect switch upstream of
the rooftop unit. Lock the disconnect switch in the open
position while working at the unit.
• Interchange any two of the fan motor leads at the
contactor for each fan that is rotating backwards.
Direct-Drive Supply Fan Speed
Adjustment
Units equipped with a DDP Supply Fan do not use belt/
sheave arrangements to adjust fan speed. This
adjustment is made through the IntelliPak™ Human
Interface (HI). Refer to the Programming
WARNING
Hazardous Service Procedures!
The maintenance and troubleshooting procedures
recommended in this manual could result in exposure
to electrical, mechanical or other potential safety
hazards. Always refer to the safety warnings provided
throughout this manual concerning these procedures.
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. Failure to
follow all of the recommended safety warnings
provided, could result in death or serious injury.
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.
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.
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