RT-SVX36G-EN
177
Maintenance
Fan Belt Adjustment
The supply fan belts and optional exhaust 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 below; adjust the belt tension as follows;
60
43
6/168
3/8”/Enhanced
136
3/252
5/16/Enhanced
3/156
5/16/Enhanced
70
43
6/168
3/8”/Enhanced
136
3/252
5/16/Enhanced
4/156
5/16/Enhanced
75
43
6/168
3/8”/Enhanced
136
3/252
5/16/Enhanced
4/156
5/16/Enhanced
90 Std
59.3
4/148
1/2 / Enhanced
152
3/144
3/8 Smooth
NA
NA
90 Hi Cap
59.3
6/148
1/2 / Enhanced
152
3/144
3/8 Smooth
NA
NA
90 Hi EER
59.3
6/148
1/2 / Enhanced
152
4/144
3/8 Smooth
NA
NA
105 Hi Cap
59.3
5/148
1/2 / Enhanced
152
4/144
3/8 Smooth
NA
NA
115 Std Cap
59.3
6/148
1/2 / Enhanced
152
4/144
3/8 Smooth
NA
NA
130 Std Cap
59.3
6/148
1/2 / Enhanced
152
4/144
3/8 Smooth
NA
NA
Table 64. Refrigerant coil fin data (continued)
Condenser Coil
Evaporator Coil
Aluminum Fins
Copper Fins
Tonnage
Size
(ft2)
Rows/Fin
Series
Tube Diameter/
Surface
Size
(ft2)
Rows/Fin
Series
Tube Diameter/
Surface
Rows/Fin
Series
Tube Diameter/
Surface
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.
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 90. Browing (or gates)
tension gauge
