Chapter 7 System Operation And Maintenance 65
Liebert. PEX+Series Precision Air Conditioner User Manual
Chapter 7 System Operation And Maintenance
This chapter introduces the operation and maintenance of the Liebert.PEX+ AC, including routine maintenance and
inspection items, electrical connection inspection, control component appearance checking, and air cooled condenser,
filter , infrared humidifier and electric heating maintenance guidance.
warning
！
During the operation of the Liebert.PEX+ , lethal voltage may be present in theequipment.It is a must to obey all
the notes and warnings marked on the equipment or contained in this manual, otherwise injury or fatality may
occur.
Only qualified maintenance personnel can operate and handle the equipment.
7.1 Monthly Routine Inspection Items
Check the system components monthly, focusing on system function and component wearing symptoms, and the
inspection items are shown in Table 7-1.
Table 7-1 Monthly routine inspection items
Components
Inspection items
Filter
Check if filter is clogged and damaged.
Clean the filter
Fan
Check if fan blades are distorted.
Compressor
No leakage
Check for noise and observe vibration condition
Air cooled condenser
Cleanliness of condenser fins
Fan base is rigid.
Check if vibration absorbing cushion is aging or damaged
Check if SPD board(if any) is working, and check once a week in
thunderstorm seasons.
Refrigerant pipes have suitable support
Cooling system
Check refrigerant pipes
Check the moisture condition in system through sight glass
Check HGBP valve (if HGBO system is equipped)
Check thermal expansion valve
Check water inlet/outlet temperature for unit with dual cooling sources
or free cooling unit
Check if the condensed water pan is clogged
Heating system
Check the operation of reheat system components
Check eroding condition of components
Infrared humidifier
Check if water pan drainage is clogged
Check the lamp of humidifier
Check water pan for mineral deposits
7.2 Routine Inspection Items (Half A Year)
See Table 7-2 for the routine maintenance items every half a year.
Table 7-2 Routine maintenance items every half a year
Components
Inspection items
Filter
Check if filter is clogged and damaged
Clean the filter
Fan
Check if fan blades are distorted.
Bearings in good condition
Check and fix connectors
