114
RT-SVX36G-EN
Unit Start Up
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.
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.)
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.
HIGH VOLTAGE IS PRESENT AT TERMINAL BLOCK 1TB1 OR UNIT 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.
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.
