Maintenance; Fan Belt Adjustment - Belt Drive Units; Monthly Maintenance; Filters - Trane YHC092E Installation, Operation And Maintenance Manual

Maintenance

Fan Belt Adjustment - Belt Drive
Units
WARNING
Rotating Components!
During installation, testing, servicing and
troubleshooting of this product it may be necessary to
work with live and exposed rotating components. Have
a qualified or licensed service individual who has been
properly trained in handling exposed rotating
components, perform these tasks. Failure to follow all
safety precautions could result in rotating components
cutting and slashing technician which 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 56, p. 51, 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 56, p.
5. Remove the belt tension gauge. The small O-ring now
indicates a number other than zero on the plunger's
force scale. This number represents the force (in
pounds) required to give the needed deflection.
6. Compare the "force" scale reading
appropriate "force" value listed in
"force" reading is outside the range, readjust the belt
tension.
RT-SVX21K-EN
51.
(Step 5) with the
Table 13, p. 51. If the
Note: Actual belt deflection "force" must not exceed the
maximum "force" value shown in
7. Recheck the belt tension at least twice during the first
2 to 3 days of operation. Belt tension may decrease
until the new belts are "run in" .
Figure 56. Belt tension gauge
Table 13. Belt tension measurement and deflection
Deflection Force (Lbs.)
Belts Small
Cross P.D Super
Section Range Gripbelts
Min. Max. Min.
3.0 - 3.6 3 4 1/2 3 7/8
A 3.8 - 4.8 3 1/2 5
5.0 - 7.0 4 5 1/2 5
3.4 - 4.2 4 5 1/2 5 3/4
B 4.4 - 5.6 5 1/8 7 1/8 6 1/2
5.8 - 8.8 6 3/8 8 3/4 7 3/8

Monthly Maintenance

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.
Before completing the following checks, turn the unit OFF
and lock the main power disconnect switch open.

Filters

Inspect the return air filters. Clean or replace them if
necessary. If included, leave filter removal tool in unit.
Refer to the unit Service Facts for filter information.
Figure 56, p. 51.
Steel Cable
Gripnotch Gripbelts
Max. Min. Max
5 1/2 3 1/4 4
4 1/2 6 1/4 3 3/4 4 3/4
6 7/8 4 1/4 5 1/4
8 4 1/2 5 1/2
9 1/8 5 3/4 7 1/4
10 1/8 7 8 3/4
51