Greenheck TSU Base Unit Manual (464441) - Manual (Page 31)

Make-Up Air Unit 31
®
IMPORTANT
Lubricate bearings prior to periods of extended
shutdowns or storage and rotate shaft monthly to aid
in corrosion prevention. If the fan is stored more than
three months, purge the bearings with new grease
prior to start-up.
Recommended Bearing Lubrication Schedule
(in months*)
Fan
RPM
Bearing Bore Size (inches)
1 ⁄
2
- 1 1 1 ⁄
8
- 1 1 ⁄
2
1 5 ⁄
8
- 1 7 ⁄
8
1 15 ⁄
16
- 2 3 ⁄
16
2 7 ⁄
16
- 3
250 6 6 6 6 6
500 6 6 6 5 4
750 6 5 4 3 3
1000 5 3 2 1 1
1250 5 3 2 1 1
1500 5 2 1 1 0.5
2000 5 1 1 0.5 0.25
*Suggested initial greasing interval is based on 12 hour per
day operation and 150°F maximum housing temperature.
For continuous (24 hour) operation, decrease greasing
interval by 50%
• If extended grease lines are present, relubricate while in
operation without endangering personnel.
• For ball bearings (operating) relubricate until clean grease
is seen purging at the seals. Be sure not to unseat the seal
by over lubricating.
• For ball bearings (idle) add 1-2 shots of grease up to 2 inch
bore size, and 4-5 shots above 2 inch bore sizes with a
hand grease gun.
• For roller bearings add 4 shots of grease up to 2 inch bore
size, and 8 shots for 2-5 inch bore size with a hand grease
gun.
• Adjust relubrication frequency based on condition of
purged grease.
• A high quality lithium based grease conforming to NLGI
Grade 2 consistency, such as those listed here:
Mobil 532
Mobilux #2 Texaco Multifak #2
Texaco Premium #2 B Shell Alavania #2
Exxon Unirex #2
Motors
Motor maintenance is generally limited to cleaning and
lubrication (where applicable).
Cleaning should be limited to exterior surfaces only.
Removing dust and grease build-up on the motor
assures proper motor cooling.
Motors supplied with grease fittings should be
greased in accordance with the manufacturer’s
recommendations.
IMPORTANT
Do not allow water or solvents to enter the motor
or bearings. Motors and bearings should never be
sprayed with steam, water or solvents.
IMPORTANT
Greasing motors is only intended when fittings are
provided. Many motors are permanently lubricated,
requiring no additional lubrication.
Snow Accumulation
Clear snow away from roof mounted units. Keep the
snow clear of the intake and access doors.
Wheels
Wheels require little attention when moving clean air.
Occasionally oil and dust may accumulate on the wheel
causing imbalance. When this occurs the wheel and
housing should be cleaned to assure proper operation.
Bearings
The bearings for our fans are carefully selected to
match the maximum load and operating conditions
of the specific class, arrangement and fan size. The
instructions provided in this manual and those provided
by the bearing manufacturer will minimize any bearing
problems.
Filters
Filter maintenance is generally limited to cleaning and
replacement.
If aluminum mesh filters are installed, they can be
washed in warm soapy water.
An adhesive spray can be added to aluminum mesh
filters to increase their efficiency.
If disposable filters are installed, they can be checked
by holding up to a light source. If light cannot pass
through the filter, it should be replaced.
IMPORTANT
When reinstalling filters, be sure to install them with
the airflow in the correct direction. An airflow direction
arrow is located on the side of the filters.
IMPORTANT
Replacement filters should be from the same
manufacturer and the same size as the original filters
provided with the unit.