Open-Drive Motor Handling/Rigging; Open-Drive Motor Storage; Compressor Bearing And Gear Maintenance; Inspect The Heat Exchanger Tubes - Carrier 17 Start Up & Operation Manual

Open-Drive Motor Handling/Rigging —
tor is provided with lifting lugs, welded to the four corners
of the motor frame, for lifting the assembled machine. The
motor should always be lifted by using the lifting lugs lo-
cated on all four corners of the motor frame. (See Fig. 46.)
Spreader bars of adequate capacity and number must be
used to avoid applying any pressure against the top air
housing with the lifting plugs.
Fig. 46 — Lifting Open-Drive Motor
If the motor is lifted with the top air housing removed, the
angle of the lifting slings with the horizontal should never
be less than 45 degrees.
With the exclusion of the TEWAC cooler, the top air hous-
ing is provided with 3 ⁄ -10 tapped holes for lifting devices to
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be installed in order to remove the air housing from the mo-
tor. The top air housing can be detached by removing the
enclosure holddown bolts, located in the inside corners of
the enclosure. These enclosure holddown bolts are accessed
through the louver/screens located on the front and rear end
of the machine or through access panels bolted to the sides
of the enclosure.
Uneven lifting must always be avoided. When single
point lifting is to be used, slings of equal lengths must
always be used to avoid uneven lifting.
Under no circumstances should the motor be lifted us-
ing the shaft as an attachment point.
NOTE: Refer to weights specified on certified drawing to
determine proper lifting equipment required for specific com-
ponents or assemblies.
Open-Drive Motor Storage —
Each mo-
be placed in extended shutdown, certain precautions must
be taken to provide proper protection while the motor is be-
ing stored. The motor should be stored under cover in a clean,
dry location and should be protected from rapid temperature
changes.
Since moisture can be very detrimental to electrical com-
ponents, the motor temperature should be maintained at ap-
proximately 5° F (3° C) above the dew point temperature by
providing either external or internal heat. If the motor is
equipped with space heaters, they should be energized at the
voltage shown by the space heater nameplate attached to the
motor. Incandescent light bulbs can be placed within the mo-
tor to provide heat. However, if used, they must not be al-
lowed to come in contact with any parts of the motor because
of the concentrated hot spot that could result.
This motor has been provided with a shaft shipping brace
or shipping bolt (normally painted yellow) to prevent shaft
movement during transit, it must be removed to allow shaft
rotation (refer to Before Initial Start-Up, Remove Shipping
Packaging section, page 47.) It is very important that this
brace be reinstalled exactly as it was originally, before the
motor is moved from storage or any time when the motor is
being transported. This prevents axial rotor movement that
might damage the bearings.
Motors equipped with sleeve bearings are shipped from
the factory with the bearing oil reservoirs drained. In stor-
age, the oil reservoirs should be properly filled to the center
of the oil level gage with a good grade of rust inhibiting oil
(refer to the certified drawing for oil viscosity and any spe-
cial requirements). To keep the bearing journals well oiled
and to prevent rusting, the motor shaft should be rotated sev-
eral revolutions every 2 weeks. While the shaft is rotating it
should be pushed to both extremes of the endplay to allow
for oil flow over the entire length of the journals.
Compressor Bearing and Gear Maintenance —
The key to good bearing and gear maintenance is proper lu-
brication. Use the proper grade of oil, maintained at recom-
mended level, temperature, and pressure. Inspect the
lubrication system regularly and thoroughly.
Only a trained service technician should remove and
examine the bearings. The bearings and gears should be
examined on a scheduled basis for signs of wear. The fre-
quency of examination is determined by the hours of ma-
chine operation, load conditions during operation, and the
condition of the oil and the lubrication system. Excessive
bearing wear can sometimes be detected through increased
vibration or increased bearing temperature. If either symp-
tom appears, contact an experienced and responsible service
organization for assistance.

Inspect the Heat Exchanger Tubes

COOLER — Inspect and clean the cooler tubes at the end of
the first operating season. Because these tubes have internal
ridges, a rotary-type tube cleaning system is necessary to fully
clean the tubes. Upon inspection, the tube condition will de-
termine the scheduled frequency for cleaning, and will in-
dicate whether water treatment is adequate in the chilled water/
brine circuit. Inspect the entering and leaving chilled water
temperature sensors for signs of slime, corrosion, or scale.
Replace the sensor if corroded or remove any scale if found.
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If the machine is to