Liebert DM Series User Manual

42 Chapter 6 System Maintenance
New Liebert_DM Series Air Conditioner User Manual
6.4 Maintenance Inspection Checklist
 Note
Regular inspections are necessary to ensure proper operation of the AC unit.
Table 6-3 Maintenance inspection checklist
Liebert_DM AC
Date:
Prepared by:
Model:
Serial Number:
Type
Maintenance components
Item
Result
Monthly
Filter
Check for restricted airflow
Check the filter
Clean the filter
Humidifier (if applicable)
Check humidifier for mineral deposits
Check condition of electrodes
All hoses and fittings are tight
Indoor unit fan
Impellers free of debris and move freely
Bearings in good condition
Power SPD (if applicable)
Check for indicator color
Drain system (including
condensate pump)
Check and clean out unit drain pipes, humidifier and tray,
condensate pump and building drain pipes
Semi-
annually
Compressor
Signs of oil leaks
Vibration isolation
Refrigerant system
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
Air-cooled condenser
Condenser coil is clean
Motor mounted tightly
Bearing in good condition
Refrigerant pipes properly supported
Electric board
Check electrical connections
Check the surface for signs of corrosion
Electric heater
Check for signs of corrosion
Humidifier
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
Low-Temp low-temperature unit
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
Notes:
Signature:
Make photocopies of this form for your records.

Liebert DM Series Specifications

General

Brand	Liebert
Model	DM Series
Category	Air Conditioner
Language	English