RT-SVX36G-EN 11 3
Unit 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 the appropriate
programming manual for CV or VAV applications for the SERVICE TEST screens and
programming instructions.
5. Use Table 35, p. 108 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 48, p. 115 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 the TEST START key is pressed and the delay designated in this
step has elapsed. Press the ENTER key to confirm this choice.
7. Press the TEST 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 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.
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.
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.
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