McQuay Skyline IM 777-6 Installation And Maintenance Manual Download

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McQuay IM 777-6

Service and Maintenance

Periodic Maintenance

Check all moving parts for wear every six months.

Check bearing collar, sheave, and wheel hub setscrews,
sheave capscrews, and bearing hold-down bolts for
tightness every six months.

Annually check and snug all electrical connections.
Inspect for signs of water damage such as corrosion and
repair if necessary. Check ground conductor and
connection integrity. Service if needed.

Ball Bearing Lubrication

Motor Bearings

Supply and return fans

—Supply and return fan motors

should have grease added after every 2000 hours of operation.
Using the following procedure, relubricate the bearings while
the motor is warm, but not running. Use one of the greases
shown in

Table 15

Remove and clean upper and lower grease plugs.

Insert a grease fitting into the upper hole and add clean
grease (

Table 15

) with a low pressure gun.

Run the motor for five minutes before replacing the
plugs.

Note:

Specific greasing instructions are located on a tag
attached to the motor. If special lubrication instructions
are on the motor, they supersede all other instructions.

Fan Shaft Bearings

Any good quality lithium or lithium complex base grease,
using mineral oil, conforming to NLGI grade 2 consistency,
and an oil viscosity of 455-1135 SUS at 100°F (100-200 cSt at
40°C) may be used for relubrication.

Compatibility of grease is critical. Relubricatable bearings are
supplied with grease fittings or zerks for ease of lubrication
with hand or automatic grease guns. Always wipe the fitting
and grease nozzle clean.

Note:

Temperature ranges over 225°F are shown for lubricants only. High
temperature applications are not suitable for standard air handler
components.

CAUTION

Bearing overheating potential. Can damage the equipment.
Do not overlubricate bearings. Use only a high grade mineral
grease with a 200°F safe operating temperature. See below for
specific recommended lubricants.

Table 15: Recommended Lubricants and Amounts for Fan
Motor Bearings

Mfr. Grease

NEMA Size

Amount to Add

(oz.)

Texaco, Polystar

Polyrex EM (Exxon Mobile)

Rykon Premium #2

Penzoil Pen 2 Lube

56 to 140

0.08

140

0.15

180

0.19

210

0.30

250

0.47

280

0.61

320

0.76

360

0.81

400

1.25

440

2.12

CAUTION

For safety, stop rotating equipment. Add one half of the
recommended amount shown in

Figure 18

. Start bearing,

and run for a few minutes. Stop bearing and add the second
half of the recommended amount. A temperature rise,
sometimes 30°F (1°C), after relubrication is normal. Bearing
should operate at temperature less than 200°F (94°C) and
should not exceed 225°F (107°C) for intermittent operation.
For a relubrication schedule, see

Table 16

. For applications

that are not in the ranges of the table, contact McQuay.

CAUTION

The tables below state general lubrication
recommendations based on our experience and are
intended as suggested or starting points only. For best
results, specific applications should be monitored regularly
and lubrication intervals and amounts adjusted accordingly.

Table 16: Relubrication Intervals

(Use NLGI #2 Lithium or Lithium Complex Grease)

Speed

Temperature

Cleanliness

Relub. intervals

100 rpm

Up to 120°F

(50°C)

Clean

6 to 12 months

500 rpm