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Chapter 6 System Maintenance
6.4 Maintenance Inspection Checklist
Note
Regular inspections are necessary to ensure proper operation of the AC unit.
Liebert_DM AC
Date:
Model:
Type
Maintenance components
Filter
Humidifier (if applicable)
Monthly
Indoor unit fan
Power SPD (if applicable)
Drain system (including
condensate pump)
Compressor
Refrigerant system
Air-cooled condenser
Semi-
annually
Electric board
Electric heater
Humidifier
Low-Temp low-temperature unit
Notes:
Signature:
Make photocopies of this form for your records.
Table 6-3 Maintenance inspection checklist
Prepared by:
Serial Number:
Item
Check for restricted airflow
Check the filter
Clean the filter
Check humidifier for mineral deposits
Check condition of electrodes
All hoses and fittings are tight
Impellers free of debris and move freely
Bearings in good condition
Check for indicator color
Check and clean out unit drain pipes, humidifier and tray,
condensate pump and building drain pipes
Signs of oil leaks
Vibration isolation
Suction pressure
Discharge pressure
Superheat
Evaporator in tight and clean condition
Charging capacity of refrigerant
Evident temperature difference between before and after the
filter drier
Condenser coil is clean
Motor mounted tightly
Bearing in good condition
Refrigerant pipes properly supported
Check electrical connections
Check the surface for signs of corrosion
Check for signs of corrosion
Check and clean the inlet solenoid valve
Check and clean the outlet solenoid valve
Replace the hose that has become rigid or fragile
Clean draining pipes completely
Check for the liquid level of the refrigerant in fluid reservoir and
leak of the fluid reservoir fittings
Check whether the heating belt of the fluid reservoir works
normally
New Liebert_DM Series Air Conditioner User Manual
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