IM 178 / Page 55
Bearing overheating potential. Can cause damage to
the equipment.
Do not overlubricate bearings.
Use only a high grade mineral grease with a 200
°
F safe
operating temperature. Refer to Table 14 for specific
recommended lubricants.
Motor bearings
Supply and return fans — Supply and return fan motors
should have grease added after every 2,000 hours of
operation. Use one of the greases shown in Table 14. 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.
Bearing Lubrication
Gas Furnace
For information on maintenance of the gas furnace, refer to Bulletin No. IM 684 or 685.
Unit Storage
If air handling units are to be stored for any period of time, kit
is important to periodically rotate the fan wheel. The fan
wheel needs to be rotated to prevent any deflection in the fan
shaft which could cause unbalanced fan operation. Also, it is
important to keep the fan bearings lubricated. If the fan wheel
is not periodically rotated, grease will settle in the lower part
of the bearing. This can lead to oxidation on the upper portion
of the bearing surface which can cause bearing failure.
Preventive Maintenance
5. Clean or replace the filters as needed.
6. Check for blockage of the condensate drain. Clean the
condensate pan as needed.
7. Check the power and control voltages.
8. Check the running amperage of all motors.
9. Check all operating temperatures and pressures.
10. Check and adjust all temperature and pressure controls
as needed.
11. Check and adjust all damper linkages as needed.
12. Check the operation of all safety controls.
13. Examine the gas furnace (see Bulletin No. IM 684 or 685).
14. Lubricate the door latch mechanisms.
Preventive maintenance is the best way to avoid unneces-
sary expense and inconvenience. Have this system inspected
at regular intervals by a qualified service technician. The
required frequency of inspections depends upon the total
operating time and the indoor and outdoor environmental
conditions. Routine maintenance should cover the following
items:
1. Tighten all belts, wire connections, and setscrews (see
below).
2. Clean the evaporator and condenser coils mechanically
or with cold water, if necessary. Usually any fouling is
only matted on the entering air face of the coil and can
be removed by brushing.
3. Lubricate the motor and fan shaft bearings (see below).
4. Align or replace the belts as needed.
Moving machinery and electrical power hazards. May
cause severe personal injury or death.
Disconnect and lock off power before servicing equipment.
Sharp edges are inherent to sheet metal parts, screws,
clips, and similar items. May cause personal injury.
Exercise caution when servicing equipment.
Maintenance
Installation and maintenance are to be performed only by qualified personnel who are experienced with this type
of equipment and familiar with local codes and regulations.
!
CAUTION
!
WARNING
!
CAUTION
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