YORK INTERNATIONAL
50
Set Screw Locking Devices –
The simplest method
utilized is a bearing inner race with set screws. (See
Fig. 47) Another type has separate lock ring with set
screw. The set screws lock the ring and bearing inner
race to the shaft. (See Figure 50)
Tighten set screws securely onto the shaft. See Table
10 for torque values.
After proper installation of the
bearing(s), run the unit for 10 to 15
minutes. Shut the unit down and lock
it out. Check for proper engagement
of locking collar and tightness of set
screw(s).
COILS
The coils are fastened at the top and bottom of the end
sheets with bolts, nuts, and lock washers. In some con-
figurations, the end sheets are also bolted to supporting
channels. Access to the coils is obtained by removing
the connecting piping from the coil and the panels at
each end of the coil. In cases where two coils are
stacked, one on top of the other, the coils can be re-
moved as a single unit or individually. If removed as a
single unit, provisions should be accessible for handling
the heavier weight and the large size.
To determine if a coil has right or left connections,
face the unit from the return air inlet section.
(See Figure 53)
For all direct expansion coils it is necessary that the
refrigerant be handled in accordance with the Clean
Air Act directives and contained. To do this, follow the
instruction with the condensing unit according to Fed-
eral and Local requirements.
Inspect the coils for cleanliness. If necessary, hose the
coils down with a low pressure water hose or low pres-
sure air.
In no case should the piping joints be
heated for unsweating while refrig-
erant is within the coil. Dangerous
pressures and gases can result.
FIG. 51 –
SPLIT BEARING
LD06366
Maintenance
BEARING CAP
BEARINGS
OUTER RACE
NUTS
SEAL
TAPERED SLEEVE
LOCK WASHER
GREASE FITTING
