LS ELECTRIC L7NHF Series, User Manual

Page: 367 / 409

12. Maintenance and Inspection
12-3
12.1.3
Parts Replacement Cycle
Mechanical friction or aging of objects with certain characteristics may deteriorate performance of the
following parts or cause them to malfunction. Therefore it is important to conduct regular maintenance
checks and regular replacement.
1. Smoothing condenser: Ripple currents and other factors can cause this part to wear down. The
lifespan of the condenser depends on the operating temperature and environmental conditions. It
normally lasts for 10 years if used continuously in a normal air-conditioned environment. Inspect
the condenser at least once each year because it can rapidly age over certain short periods of time
(inspect at least once half a year as it approaches its end of life).
※
Visual inspection criteria
a. The condition of the case: Check for enlargement of the sides and bottom.
b. The condition of the lid: Check for notable enlargement, severe cracks, or broken parts.
c. The condition of the explosion valve: Check for notable valve enlargement and check the
operation status.
d. Also, regularly check whether the exterior is cracked, discolored, or leaking and whether there
are any broken parts. The condenser is obsolete when its rated capacity degrades to 85% or
lower.
2. Relays: Check for bad connection and wear and tear of the contacts caused by switching currents.
A relay is obsolete when its accumulated number of switches reaches around 100,000 times,
depending on the power capacity.
3. Motor bearings: Replace the bearings after 20,000 to 30,000 hours of operation at the rated velocity
under the rated load. Replace the bearings if abnormal sounds or vibrations are detected during
inspection, depending on the operating conditions.
[Standard Part Replacement Cycles]
Part Names
Standard Replacement
Cycle
Replacement Method
Smoothing Condenser 7~8 years Replace (Determine after inspection)
Relays
-
Determine after inspection
Fuses 10 years Replace
Aluminum electrolytic
condensers on the printed
circuit board
5 years
Replace with new boards (Determine after
inspection)
Cooling Fans 4~5 years Replace
Motor Bearings
-
Determine after inspection
Motor Oil Seal 5,000 hours Replace