11.2 Maintenance and Component Operation
11.2.1 Electric Panel
The electric panel should be inspected on a semi-annual basis for any loose electrical connections.
11.2.2 Filters
Filters are usually the most neglected item in an environmental control system. In order to maintain
efficient operation, they should be checked monthly and changed as required. ALWAYS TURN POWER
OFF BEFORE REPLACING FILTERS.
Filters are replaced by opening the hinged door on the return air filter box.
11.2.3 Blower System
Monthly inspection of the blower package include: motor mounts, belts, fan bearings and impellers.
Fan impellers should be thoroughly inspected and any debris removed. Check to see if they are tightly
mounted on the fan shaft and do not rub against the fan housing during rotation. Motor bearings are
permanently sealed and self-lubricating and do NOT need lubricated.
The drive belt should be checked monthly for signs of wear and proper tension. Pressing on belts midway
between the sheave and pulley should produce from 1/2” to 1” (12 to 25 mm) of deflection. Belts that are
too tight can cause excessive bearing wear.
Belt tension can be adjusted by raising or lowering the fan motor base. Loosen nut above motor mounting
plate to remove belt. Turn nut below motor mounting plate to adjust belt tension. If belt appears cracked
or worn, it should be replaced with a matched belt (identically sized). With proper care, a belt should last
several years.
NOTE: After adjusting or changing the belt, always be certain that motor base nuts are tightened. The
bottom adjustment nut should be finger tight. The top locking nut should be tightened with a wrench.
Air Distribution
Since all unit models are designed for constant volume air delivery, any unusual restrictions within the air
circuit must be avoided. High efficiency filters can reduce air performance and evaporator capacity.
11.2.4 Blower Removal
If the blower or bearings must be removed or serviced, use the following procedure.
NOTICE
Risk of refrigerant and water/glycol piping damage. Can cause leaks that result in equipment
and building damage and loss of cooling.
Use caution and do not contact piping when removing the blower motor and blower sled.
1. Remove the main center section of the three-piece electric panel by first marking and
disconnecting all power and control wiring entering the panel.
2. Remove the panel by removing screws from top and bottom sections
3. Remove the blower motor from the blower sled.
4. Remove the four bolts holding the blower sled to the base isolators.
5. Slide the blower/sled assembly forward and rotate 90°.
Vertiv | Liebert Mini-Mate2—5 ton User Manual| 76
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