General • Maintenance

Trane® Axiom™ Rooftop Water Source Heat Pumps: Preventive Maintenance

This procedure is for the preventive maintenance of your unit. It has been simplified and has a list of preventive suggestions that focuses on your equipment's filter.

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10/24/2021

Trane® Axiom™ Rooftop Water Source Heat Pumps: Preventive Maintenance

This procedure is for the preventive maintenance of your unit. It has been simplified and has a list of preventive suggestions that focuses on your equipment's filter.

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

The supply 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 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 63, p. 65.

Figure 63. Typical belt tension gauge

To determine the appropriate belt deflection:

Measure the center-to-center distance, in inches, between the fan sheave and the motor sheave
Divide the distance measured in Step 1a by 64; the resulting value represents the amount of belt deflection for the proper belt tension.

Set the large O-ring on the belt tension gauge at the deflection value determined in Step 1b.

Set the small O-ring at zero on the force scale of the gauge.

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.

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.

Compare the force scale reading in step 5 with the appropriate “force” value in Table 21, p. 66. 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 representative.

Note: The actual belt deflection force must not exceed the maximum value shown in Table 21, p. 66.

Recheck the new belt's tension at least twice during the first 2 to 3 days of operation. Readjust the belt tension as necessary to correct for any stretching that may have occurred. Until the new belts are “run in”, the belt tension will decrease rapidly as they stretch.

Source: Trane (www.trane.com)