46 RT-SVX23D-EN
Start-Up
Final System Setup
After completing all of the pre-start and start-up procedures outlined in the previous sections (i.e.,
operating the unit in each of its Modes through all available stages of cooling & heating), perform
these final checks before leaving the unit:
• Program the Night Setback (NSB) panel (if applicable) for proper unoccupied operation. Refer
to the programming instructions for the specific panel.
• Verify that the Remote panel “System” selection switch, “Fan” selection switch, and “Zone
Temperature” settings for automatic operation are correct.
• Inspect the unit for misplaced tools, hardware, and debris.
• Verify that all exterior panels including the control panel doors and condenser grilles are
secured in place.
• Close the main disconnect switch or circuit protector switch that provides the supply power to
the unit’s terminal block or the unit mounted disconnect switch.
Make sure all personnel are standing clear of the unit before proceeding. The system components
will start when the power is applied.
Fan Belt Adjustment - Belt Drive Units
WARNING
Live Electrical Components!
During installation, testing, servicing and troubleshooting of this product, it may be necessary
to work with live electrical components. Have a qualified licensed electrician or other individual
who has been properly trained in handling live electrical components perform these tasks.
Failure to follow all electrical safety precautions when exposed to live electrical components
could result in death or serious injury.
WARNING
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 fan belts must be inspected periodically to assure proper unit operation.
Replacement is necessary if the belts appear frayed or worn. Units with dual belts require a
matched set of belts to ensure equal belt length.
When removing or installing the new belts, do not stretch them over the sheaves. Loosen the belts
using the belt tension adjustment bolts on the motor mounting base.
Once the new belts are installed, using a Browning or Gates tension gauge (or equivalent)
illustrated in Figure 29; adjust the belt tension as follows;
1. To determine the appropriate belt deflection;
a. Measure the center-to-center shaft distance (in inches) between the fan and motor sheaves.
b. Divide the distance measured in Step 1a by 64; the resulting value represents the amount
of belt deflection that corresponds to the proper belt tension.
2. Set the large O-ring on the belt tension gauge at the deflection value determined in Step 1b.
3. Set the small O-ring at zero on the force scale of the gauge plunger.
4. Place the large end of the gauge at the center of the belt span; then depress the gauge plunger
until the large O-ring is even with the top of the next belt or even with a straightedge placed
across the fan and motor sheaves. Refer to Figure 29
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