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Restart
After extended storage, perform a complete start up. Inevitable
accumulations of dirt, insect nests, etc. can contribute to
problems if not cleaned out thoroughly prior to start up. In
addition, thermal cycling tends to loosen mechanical and
electrical connections. Following the startup procedure helps
discover these and other issues that may have developed
during the storage interval.
Bearing Lubrication
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.
Motor Bearings
Supply Fans
Supply fan motors should have grease added after every 2000
hours of operation. Use one of the greases shown in
Using the following procedure, relubricate the bearings while
the motor is warm, but not running.
1 .
Remove and clean upper and lower grease plugs.
2 .
Insert a grease fitting into the upper hole and add a small
amount of clean grease with a low pressure gun.
3 .
Install the lower grease plug.
4 .
Run the motor for five minutes before installing the upper
grease plug.
Condenser Fan and Exhaust Fan
The condenser fan and exhaust fan motors are permanently
lubricated and require no periodic lubrication.
Fan Shaft Bearings
Relubricate fan shaft bearings periodically. Relubricate
according to the schedule on the fan housing. If the bearings
are exposed to wet conditions, wide temperature variations,
or other severe atmospheric conditions, relubricate more
frequently. Use one of the greases shown in
.
While the bearing is at normal operating temperatures, rotate
the fan by hand and add only enough grease to purge the
seals. The seals bleed slightly when this occurs. Do not
overlubricate.
Table 33: Recommended Greases
Manufacture
Product Name
Temp . Range (°F)
Texaco Lubricants Co.
Premium RB
-30 to 300
Mobil Oil Corporation
Mobilith AW2
-40 to 325
Shell Oil Company
Alvania No. 2
-20 to 240
Vibration Levels
Each unit as shipped is trim balanced to operate smoothly. To
provide satisfactory operation after shipping and installation,
use accepted industry guidelines for field balancing fans.
NOTE:
Excessive vibration from any cause contributes to
premature fan and motor bearing failure. Monitor overall
vibration levels every six months of operation. An
increase in levels is an indication of potential trouble.
Vibration Causes
1 .
Wheel imbalance.
a .
Dirt or debris on wheel blades.
b .
Loose setscrews in wheel hub or bearing-to-shaft.
c. Wheel distorted from overspeed.
2 .
Bent shaft.
3 .
Faulty drive.
a .
Bad V-belts; lumpy, or mismatched.
b .
Belt tension too tight or too loose.
4 .
Bad bearings or loose bearing hold-down bolts.
5 .
Motor imbalance.
6 .
Fan section not supported evenly on foundation.
Periodic Service and Maintenance
1 .
Check all moving parts for wear every six months.
2 .
Check bearing collar, sheave, and wheel hub setscrews,
sheave capscrews, and bearing hold-down bolts for
tightness every six months.
IM 1058-8 • MAVERICK II ROOFTOP SYSTEMS
106
www.DaikinApplied.com
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aInTenanCe
Содержание MPS015 F
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Страница 80: ...Figure 70 CAV Power IM 1058 8 MAVERICK II ROOFTOP SYSTEMS 80 www DaikinApplied com Wiring Diagrams ...
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Страница 82: ...Figure 71 CAV Control Inputs IM 1058 8 MAVERICK II ROOFTOP SYSTEMS 82 www DaikinApplied com Wiring Diagrams ...
Страница 86: ...Figure 76 Energy Recovery IM 1058 8 MAVERICK II ROOFTOP SYSTEMS 86 www DaikinApplied com Wiring Diagrams ...