Vertiv™ | Liebert® AHU | User Manual
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Fan
Check whether the bearing is worn
Listen to whether there is abnormal noise
Observe whether there is vibration in the fan
Control system
Examine fuse and circuit breaker
Check and fasten the circuit connector
Check the contactor pull-on status
5.2. Routine Maintenance Inspection Items (Semi-Annual)
Refer
for routine maintenance inspection items semi-annually.
Table 5-2 Semi-Annual Routine Check List of Items
Parts
Items for inspection
Inspection Results
Remark
Screen
Check whether the screen is damaged or blocked
Check whether the differential pressure valve of the
screen is within reasonable range
Clean the screen
Chilled water coil
Clean the water system
Check whether the coil is leaked
Check whether there is dust and foreign objects in the
water pan
Check whether there is foreign objects on the coil
Check whether the water pan is blocked
Listen to the running sound
Observe the running vibration
Water valve
Check whether the indicator of the two-way valve
flashes in green
Listen to the water flow of the two-way valve for any
abnormal noise
Observe the vibrating status of the two-way valve
Check the water flow
Check the hydraulic resistance
Fan
Check whether there is deformation on the fan impeller
Check whether the fan and fan shroud is firmly fixed
Check whether the bearing is worn
