Trane BCHC, BCVC manual Maintenance, Fan Assembly Set Screws, Fan Belt Tension, Torque in.-lb Ft-lb

Maintenance

sheaves and pull tight. Adjust sheaves and tighten the sheave set screws to the correct torques recommended in Table 31.

Figure 15. Clearance recommendation to	Figure 16. Correct sheave alignment
prevent fan frame and belt interface

Table 31. Recommended torques for tightening sheaves and bearing thrust collar

	Torque (in.-lb)	Ft-lb	N-m
Sheave setscrew	144	12	16.3
Bearing thrust collar	66	5.5	7.5
Fan wheel screw	144	12	16.3

Fan Assembly Set Screws

Check and adjust fan wheel, bearing, and sheave set screws whenever a component is removed or an adjustment is made. Refer to Table 31 for recommendations.

Fan Belt Tension

Proper belt tension is necessary to endure maximum bearing and drive component life and is based on fan brake horsepower requirements. Replace belt when frayed or worn.

Fan belt tension should only be tight enough so the belt does not slip and maintains adequate airflow.

Note: Check fan belt tension at least twice during the first days of new belt operation since there is a rapid decrease in tension until belts are run-in.

Be careful not to over-tension fan belt. Excessive tension will reduce fan and motor bearing life, accelerate belt wear and possibly cause shaft failure. Clean the sheaves and belt with a dry cloth. Keep oil and grease away from the belt because they may cause belt deterioration and slippage. Trane does not recommend belt dressing.

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