Table of Contents
Advertisement
Maintenance
The maintenance interval periods are
IMPORTANT
stated, guidelines only. Any large
deviations in the pattern of usage may
necessitate further maintenance
Do not overlubricate bearings.
attention.
Excessive pressure caused by
overlubrication can displace bearing
grease seals or cause grease to
IMPORTANT
overheat the bearing, resulting in
premature bearing failure.
During maintenance operation
the unit must be compelety
3. Fan Motors
isolated and precautions teken
to prevent any premature restart.
lnspect periodically for excessive
vibration or temperature. Operating
1. Fan
conditions will vary the frequency of
inspection and lubrication. Contact the
If the fan / motor assembly is going to
motor manufacturer or Trane for
be stored for two weeks before use,
lubrication instruction. Most smaller
the fan should be rotated by hand at
frame motors comes without grease
weekly intervals to avoid bearing
nipple where the bearings are
damage.
permanently sealed.
If storage will be over one month it is
The motors with double shielded
recommended that the belts be
bearings are lubricated for life and
slackened as well.
cannot be relubricated.
Check for soiling, damage, corrosion,
W.E motors up to 132 frame and TECO
and any tendency to bind. Clean as
and Brook Hansen motors up to 180
necessary.
frame comes with sealed for life
Check that the flexible connection are
bearings,while motors above this range,
securely fixed.
have open bearings with"flush
Check the function of all antivibration
through"re-greasing facilities.
mounts.
Check for any obstructions or
WARNING
blockages of the air intakes and
discharges.
DISCONNECT POWER SOURCE
Check the traps for leaks or blockages
FOR MOTOR LUBRICATION.
and prime as necessary.
FAILURE TO DO SO MAY RESULT
2. Bearing Test
IN INJURY OR DEATH FROM
ELECTRIAL SHOCK OR MOVING
PARTS.
Check that the fan bearing is tightened
and is not unduly noisy, by sounding it
To re-lubricate the motor, complete the
using a metal bar as a conductor.
following:
Where a belt guard has been supplied,
1. Turn the motor off. Make sure it
check that it is fitted correctly.
cannot accidentally restart.
If there is any irregular noise or
2. Remove the relief plug and clean out
knocking, renew both bearings. Fan
any hardened grease.
bearing are greased for life, but larger
3. Add fresh grease through the fitting
units with standard bearings require
with low pressure grease gun.
annual lubrication. These have grease
4. Run the motor for few minutes to
nipple. In the case of extreme running
expel any excess grease through
conditions, lubricate in accordance
the relief vent.
with the following recommendations:
5. Stop the motor and replace the relief
Recommended lubricants;
plug.
ALVANIA
GREASE 3 (SHELL)
MOBILUX 3 (MOBIL)
BEACON 3 (ESSO)
SKF 28 (BALL BEARINGGREASE)
22
Table2
4.Air Filters
Motor Greasing lntervals
Relubrication Period
Rated
Suggest the panel filter allowable
Poles
Standard
Severe
output kW
maximum resistance is about 130 Pa,
condition
condition
the bag filter allowable maximum
4upwards
7years
3years
0-30
resistance is about 260 Pa, the highly
37-75
4upwards
210days
70days
efficient filter allowable maximum
90-110
4upwards
90days
30days
resistance is about 500 Pa. When the
resistance is close to the allowable
maximum, the filter need to be clean or
Standard condition: 8 hour operation
replaced, and according to the actual
per day with rated or light loading in a
usage of the unit, when the filter need
clean and low vibration environment.
cleaning for many times, please
Severe condition: 24 hour operation
choose aluminum mesh filter, in
per day with rated/light loading or in a
addition, the chemical fiber filter after
dirty/ dusty environment or where the
when cleaning must be soaked in
motor is subject to vibration/light
water for gentle scrub and fully dry,
shock loading.
when the filter efficiency is lower than
the original efficiency 85%, the filter
Grease Type:
must be replaced in accordance with
TECO/Brook Hansen motor - Use
size,type and filtration efficiency.
Esso Unirex Lithium N3 grease. W.E
motor - Use Shell Alvania R3.
5. Drain Pans
Inspecting Cleaning
The condensate drain pan and drain
line must be checked to assure that
the condensate drains as designed.
This inspection should occur a
minimum of every six months or more
often as dictated by operating
experience.
For units with sloped drain pans: If
evidence of standing water or
condensate overflow exists. steps
should be taken to identify and remedy
the cause immediately. Refer to the
troubleshooting section of this manual
for possible causes and solutions. If
microbial growth in the drain pan is
observed, it should be cleaned and
removed immediately. Drain pans
should be cleaned using the following
procedure:
Maintenance
1. Disconnect all electrical power to the
WARNING
unit.
2. Don the appropriate personal
protective equipment (PPE).
Follow all directions provided with
3. Remove all standing water.
chemical cleaners to avoid
4. Use a scraper or other tools to
personal injury and/or coil damage.
remove any solid matter. Remove solid
Commercially available chemical
matter with a vacuum device that
cleaners may contain caustic or
utilizes high efficiency particulate
hazardous agents.
arrestance (HEPA) filters with a
minimum efficiency of 99.97% at 0.3
In the event of coils being out of com-
micron particle size.
mission for some time, it is advisable to
completely drain down the coil. On
5. Thoroughly clean the contaminated
each occasion when refilling is
area(s) with a mild bleach and water
undertaken, check that the coil is
solution or an EPA-approved sanitizer
effectively vented.
specifically designed for HVAC use,
Periodic cleaning of the coils is
Carefully
follow
the
sanitizer
required.
manufacturer's instructions regarding
Dirty coils have increased airside
the use of the product.
pressure drops and reduced heat
6. Immediately rinse the drain pan
transfer, thus unbalancing the cooling
thoroughly with fresh water to prevent
or heating system.
potential corrosion from the cleaning
Cleaning
solution of the drain pan and drain line
In the event that fin edges have been
components.
bent, they can be straightened with the
7. Allow the unit to dry thoroughly
aid of a coil comb.
before putting the system back into
The cleaning is carried out with the unit
service. 8. Determine and correct the
intact using a powerful vacuum cleaner
cause of the microbial contamination.
on the dust-contamainated side. If the
9. Be careful that the contaminated
unit is very dirty it will need to be
material does nit contact other areas of
removed and wet cleaned.
the unit or building. Properly dispose of
If required, soft cleaning brushes may
all contaminated materials and
be used ensuring that the heat
cleaning solution.
exchanger fin are not damaged.
Frost protection
6.Coil Cleaning
Check that frost protection is working
before the commencement of each
Steam, hot water and chilled water
winter period. Ensure that the frost
coils should be kept clean to maintain
sensor is correctly installed and fitted
maximum performance. lf fins become
and is working within the correct
dirty, clean with steam and detergent,
temperature range.
hot water spray and detergent, or one
Drop eliminator
of the commercially available chemical
Check the cleanliness of the droplet
coil cleaners. Rinse coils throughly
separator section and the blades
after cleaning.
annually. If the blades are dirty, remove
and clean them. Contamination can
result in damage through water
droplets in the system's performance.
Ensure that the blades are correctly
repositioned and that they are not
distorted.
23
Advertisement
Table of Contents
