LG LCWW, Operation & Maintenance Manual, Page: 92 / 119

92
7. MAINTENANCE
ENGLISH
- Lubrication system daily inspection standard
- Evaporator daily inspection standard
* If the evaporation pressure becomes low, the copper tubes in the evaporator will freeze causing danger to break-
down. The major reasons for the lowering of the evaporation pressure are insufficient refrigerant, lowering water
temperature and poor heat exchanging.
* As in the case of condenser tube, if foreign material is entered into tube or scale is attached to tube, corrosion may
occur, lowering the heat exchanging capacity.
Figure 59 Evaporator daily inspection standard
Classification Inspection items Inspection method Standard
Evaporator
Chilled water
Inlet Check in the panel 5~15°C or lower
Outlet Check in the panel 3°C or higher
Evaporation pressure(temper-
ature)
Check in the panel
2 ~ 5 kg/cm²(R134a)
4 ~ 8 kg/cm²(R22)
Heat exchanging status
Difference between evaporation
temperature and chilled water
outlet temperature
0.5~3°C
Amount of refrigerant charged Check through sight-glass
Refrigerant status Check through sight-glass
Classification Inspection items Inspection method Standard
Oil
Oil amount Visual check
Oil surface exists on the sight-
glass
Leakage Oil system visual check There should be no leakage.
Figure 60 Lubrication system daily inspection standard