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Table 74. Air-cooled condenser—refrigerant coil fin data (continued)
Coil Type
Tons
Evaporator
120
Hi-Cap Evap
Condenser
Evaporator
130
Hi-Cap Evap
Condenser
Evaporator
150
Condenser
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 new
belts, do not stretch them over the sheaves; instead,
loosen the adjustable motor-mounting base.
Once the new belts are installed, adjust the belt tension
using a Browning or Gates tension gauge (or equivalent)
illustrated in
Figure 114, p.
Figure 114. Typical belt tension gauge
Deflection = Belt Span (in.)
64
Deflection = Belt Span (mm)
152
RT-SVX073A-EN
Coil Fin Config.
Tube Dia.
Internally Finned
1/2
Internally Finned
1/2
Enhanced
25 mm
Internally Finned
1/2
Internally Finned
1/2
Enhanced
25 mm
Internally Finned
1/2
Smooth
25 mm
175.
Force Scale
Small
O-Ring
Span Scale
Large
O-Ring
Fins per foot
Coil Rows
4
168
6
168
2
240
4
168
6
168
2
240
6
168
2
240
Hazardous Voltage w/Capacitors!
Failure to disconnect power and discharge capacitors
before servicing could result in death or serious
injury.
Disconnect all electric power, including remote
disconnects and discharge all motor start/run
capacitors before servicing. Follow proper lockout/
tagout procedures to ensure the power cannot be
inadvertently energized. For variable frequency drives
or other energy storing components provided by
Trane or others, refer to the appropriate
manufacturer's literature for allowable waiting periods
for discharge of capacitors. Verify with a CAT III or IV
voltmeter rated per NFPA 70E that all capacitors have
discharged.
1. To determine the appropriate belt deflection:
a. Measure the center-to-center distance, in inches,
between the fan sheave and the motor sheave.
b. Divide the distance measured in Step 1a by 64; the
resulting value represents the amount of belt
deflection for 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.
4. Place the large end of the gauge on the belt at the
center of the belt span. Depress the gauge plunger until
the large O-ring is even with the of the second belt or
even with a straightedge placed across the sheaves.
5. Remove the tension gauge from the belt. Notice that
the small O-ring now indicates a value other than zero
on the force scale. This value represents the force (in
pounds) required to deflect the belt(s) the proper
distance when properly adjusted.
6. Compare the force scale reading in step 5 with the
appropriate "force" value in . If the force reading is
outside of the listed range for the type of belts used,
either readjust the belt tension or contact a qualified
Service and Maintenance
Coil Face Area
Tube Type
(sq. ft.)
Internally Finned
106.25
Internally Finned
106.25
161
Microchannel
Internally Finned
106.25
Internally Finned
106.25
161
Microchannel
Internally Finned
106.25
161
Microchannel
WARNING
175
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